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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 913
CFD Analysis of Symmetrical Tangential Inlet Cyclone Separator
Abhijeet Gayakwad1 , Dr.Shivarudraiah2
1PG Student Department Of Mechanical Engineering, University Visvesvaraya College Of Engineering
Bangalore, India
2Professor Department Of Mechanical Engineering, University Visvesvaraya College Of Engineering
Bangalore, India
------------------------------------------------------------------------------***---------------------------------------------------------------------------
Abstract - Many industries are using the cyclone dust
separators without any modifications for more than a
century. The gas solid cyclone separator is widely used in
industries. For predicting the cyclone performance in terms
of velocity and pressure variation, a large number of
computational study was conducted due to its much
application in the industrial area. The simulation is carried
out using computational fluid dynamics (CFD) for gas-
particle flow with cyclone separator in one of the
approaches. Most of the attention is focused on improving
the cyclone performance parameters. Recently most of the
studies focused on the geometric effect on the cyclone
performance. In this paper the geometric effect on cyclone
separator is studied with the creation of symmetrical
tangential inlet cyclone separator and compared it with the
classical cyclone separator. The results showed that the new
geometric modification to the cyclone improves the
performance.
Key Words : Cyclone, CFD, Particle Flow, Symmetric
inlet Separator.
1. INTRODUCTION
The cyclone separators are widely used in the removal
of dust particles from the gas flow in industrial processes.
Cyclone dust separators have been used in industries to
separate dust particles from the gas solid flow and intern
reduce the air pollution occurring due to the chimney
smoke in the chemical plant (Ogawa 1997). The cyclone
separators are the most robust dust separators. In a
classical cyclone separator the dust gas enters tangentially
and forces the flow to follow spiral motion. Thus the
created centrifugal force forces the dust particle towards
the wall of the cyclone. After striking the wall of cyclone,
the particles fell down and separated. In the new
engineering applications the cyclone separators are used
as reactors, dryers in petroleum industries to remove
catalyst from the gases. The cyclone geometry is the most
important parameter that affects the cyclone performance
[8]. The solid dust particles are immediately bifurcated
into two layers as soon it enters the cyclone due to the
eddy currents generated in the coaxial space between the
cyclone body and exit pipe. One of them goes upper
surface around the coaxial space and rates with the gas
flow around the exit pipe. The other layer rotates and
descends down along the surface of the cyclone. Then in
the cone surface the dust layers are pressed by the
centrifugal force and descend down due to gravitational
forces in the boundary layer. Lastly these dust layers are
separated. However some of the dust rolls up due to the
secondary air flow in the boundary and flows through the
exit pipe. The centrifugal effect, which is responsible for
separating the dust particles, depends on tangential
velocity of particles. Therefore the tangential velocity
must be increased to increase the cyclone efficiency
because it relates to the pressure drop.
2. Cyclone Design
2.1 Geometry
The cyclone geometry is constructed by using
Stairmand’s high efficiency cyclone design method.
Stairmand conducted so many experiments on the cyclone
separator and finally developed the optimized geometrical
ratios. By considering this geometric ratio’s the modelling
of the cyclone done in catia V5.
Take Dc=0.30 meter, which is comparatively safe as it is
close to standard size diameter of 0.203 meter Thus, the
dimension of the design cyclone is as under Stairmand’s
design,
Dc=diameter of cyclone=0.30 m
Height of inlet duct
Hi=0.5 Dc=0.5x0.3=0.15m
Width of inlet duct=wi=0.2
Dc =0.2x0.30=0.06 m
Diameter of out let duct=D0=0.5
Dc =0.5x0.3=0.15m
Diameter of dust outlet
Dd=0.375xDc =0.375x0.3=0.11m
Length of cyclone main body
(1.5Dc) =1.5x0.3=L1=0.45m
Length of cyclone hopper
= 2.5Dc=2.5x0.3=L2=0.75m
Total length of cyclone=L1+L2=1.2m
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 914
Fig. 2.1.1 Cyclone Design
2.2 Geometry modification
In order to increase the cyclone performance, tangential
velocity must be increased. So in order to increase the
cyclone tangential velocity an extra inlet symmetric to the
standard cyclone design is added. With following design
dimensions,
Height of inlet duct
Hi=0.5 Dc=0.5x0.3=0.15m
Width of inlet duct
wi=0.2 Dc =0.2x0.30=0.06 m
Fig. 2.2.1 Single inlet cyclone design
Fig. 2.2.2 Symmetrical inlet cyclone design
3. CFD ANALYSIS
Import the cyclone design from the solid works. Open the
design modeler. Click on generate the imported geometry
appears. Select the part body in the tree outline .select the
body click on the screen. Change the solid body into the
fluid body. Close the design modular and save the project.
3.1 MESH
Open mesh.>create named sections
1. Select the inlet face.name it as velocity inlet
2. Select the outlet face and name it as pressure outlet.
3. Select the rest of the faces and name them as wall.
Select mesh in tree outline. In mesh details default
conditions are set to be CFD and FLUENT solver as shown
in the fig and fig . Give high smoothing condition and fine
relevance. And change the transition slow to fast to reduce
the no. of elements. Select mesh and click generate mesh
to obtain mesh.
Fig.3.1.1 Meshed Single cyclone separator
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 915
Fig.3.1.2 Meshed Symmetric cyclone separator
Mesh Properties
Tabel 1. Mesh properties
Single Inlet Symmetrical
Inlet
Nodes 5426 5484
Elements 25809 25791
3.2 SETUP
Double click on the fluent set up to set the
Simulation conditions. The software automatically
recognizes the 3d dimension. The display mesh after
reading, embed graphics windows and work bench colour
scheme must be enabled. Enable the double precision and
serial processing options. Then click ok to open the fluent.
STEP 1: General > check mesh (To verify the mesh is
correct or not) Enable pressure based type, absolute
velocity formulation and transient time steps
Fig.3.2.1 General Conditions
STEP 2: In models select the realizable k-epsilon (2eqn)
Model and RNG model with swirl dominated flow and
standard wall functions.
Fig.3.2.2 Defining the models
Step 3 – DPM is set to on and create new injection for both
the cyclones. The particles will enter from the inlet surface
with 15m/s.
Fig. 3.2.3 Defining the models
Fig.3.2.4 Injection details
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 916
Creating injections
STEP 4: Boundary condition Velocity inlet>
x-velocity=15m/s
Fig.3.2.5 Inlet velocity boundary conditions
Outlet
Turbulence; specification method> Intensity and Viscosity
ratio Backflow Turbulence kinetic energy= 5 m2/s2
Backflow Turbulence dissipation rate=10 m2/s3.
Fig.3.2.6 Outlet boundary conditions
3.3 Solution Methods
Fig.3.3.1 Details of solution methods
STEP 5: Initialization: Select standard initialization and
compute from inlet velocity
Fig.3.3.2 Initialization conditions
STEP 6: RUN> Check case>close
Time step size(s) =1; Number of time steps =50; Max.
Iterations = 555/ time step = 20 > calculate
4. SOLUTION
Residuals
Fig.4.1 Single Inlet cyclone separator Residual Graph
Fig.4.2 Symmetrical Inlet Cyclone Separator Residual
Graph
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 917
The solution is converged at the 255th iteration. The
vector fig.4.1 and fig.4.2 shows that the path followed by
the fluid inside the cyclone. The flow follows swirl flow
conditions as explained in the principle of the cyclone
separator. The left side bar shows various velocity ranges.
The colour obtained in the vectors show the variation of
velocity at the different sections. The values of the velocity
can be studied from the left side scale.
5.RESULTS AND DISCUSSIONS
5.1 CONTOUR RESULTS
Pressure contours
Pressure contours are plotted and it is observing that non-
Dimensionalized static pressures are in the range of -22.98
to 248 respectively for single inlet cyclone. Static pressure
is increasing from centre to wall surface but along the
vertical section pressure is not uniform, it is decreasing at
the bottom of the cone section of the cyclone as in case of
single inlet cyclone separator.
Fig.5.1.1 Static pressure contour of single inlet cyclone
Pressure contours are plotted and it is observing that non-
Dimensionalized static pressures are in the range of -133
to 567 respectively for symmetric inlet cyclone. The static
pressure is increasing from centre to the wall. The static
pressure in uniform throughout the cyclone body as
compared to the single inlet cyclone separator.
Fig.5.1.2 Static pressure contour for symmetrical inlet
cyclone
5.2 VELOCITYpVECTORS
Table. 2 Velocity magnitude
Velocity magnitudes
Fig.5.2.1 Velocity Magnitude Single Inlet
Fig.5.2.2 Velocity Magnitude Symmetrical Inlet
As we can see from the Fig.5.2.1 and Fig.5.2.2 the velocity
magnitude is increasing from centre to the wall of the
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 918
cyclone in both geometry. But the velocity is decreasing
from top to the bottom of the cyclone in single inlet
cyclone. The velocity magnitude is uniform almost uniform
from the top to bottom of the cyclone in symmetrical inlet
cyclone. Which gives better collection efficiency to the
cyclone.
Tangential velocity vector
Fig. 5.2.3 Tangential Velocity Single Inlet Cyclone
Fig.5.2.4 Tangential Velocity Symmetrical Inlet Cyclone
As we know that the tangential velocity of the gas flow,
which relates to the pressure drop, must be increased in
order to increase cyclone efficiency. From the data we can
see that there is an increase in the tangential velocity in
the symmetrical inlet cyclone as compared to single inlet
cyclone.
Particle traces coloured by particle residence time for
Single Inlet Cyclone
Fig.5.2.5 For single inlet cyclone
Particle traces coloured by particle residence time for
Symmetrical Inlet Cyclone –
Fig.5.2.6 For symmetric cyclone
6. CONCLUSION
The Computation Fluid Dynamics (CFD) analysis is carried
out for both single inlet cyclone and symmetrical inlet
cyclone separator under the same condition of inlet
velocity, flow rate and particle diameter. The results
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 919
showed that the pressure distribution is uniform on the
symmetrical inlet cyclone, the tangential velocity which
relates to the pressure drop, will be increased which
accounts for the better cyclone efficiency. The collection
efficiency for the modified cyclone geometry is more than
the standard cyclone design.
1. The results of pressure contour show uniform
distribution of pressure throughout the cyclone
body as compared to the standard design.
2. The results of tangential velocity vector show an
increase in the tangential velocity in the cyclone
body. Maximum tangential velocity for the single
cyclone design is 18 m/s, and for symmetrical
cyclone design is 23 m/s. This shows an increase
in the tangential velocity.
7. References
1. Ogawa, A. (1997). Mechanical Separation Process and
Flow Patterns of Cyclone Dust Collectors. Ind. Applied
Mech. Ver. , vol. 50, n. 3, p. 97.
2. Ogawa, A. and Hikichi, T. (1981). Theory of CutSize of
a Rotary Flow Dust Collector, Bulletin JSME, vol. 24, n.
188, p. 340.
3. Ogawa, A. (1984). Estimation of the Collection
Efficiencies of the Three Types of the Cyclones Dust
Collectors from the Standpoint of the Flow Patterns in
the Cylindrical Cyclone Dust Collectors. Bulletin of
JSME, vol. 27, n. 223, p. 64.
4. Stairmand, C.J. (1951).The Design and Performance of
Cyclone Separators. Trans. Inst. Chem. Eng., vol. 29, p.
356.
5. Zhao, B., Shen, H. and Kang, Y. (2004). Development of
a Symmetrical Spiral Inlet to Improve Cyclone
Separator Performance. Powder Technology, vol. 145,
issue 1, pp. 4750.
6. Cyclone Collection Efficiency: Comparison of
Experimental Results with Theoretical Predictions By
John Dirgo & David Leith
7. Bernardo S, Peres A P and Mori M
(2005),“Computational Study of Cyclone Flow Fluid
Dynamics using a Different Inlet Section Angle”,
Thermal Engineering (RETERM).
8. Bernardo S, Mori M and W P Martignoni (2006),
“Evaluation of Cyclone Geometry and its Influence on
its Performance Parameters by CFD”, Powder
Technology.
9. Lapple C E (1951), “Process Use Many Collector
Types”, Chemical Engineering.

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CFD Analysis of Symmetrical Tangential Inlet Cyclone Separator

  • 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 913 CFD Analysis of Symmetrical Tangential Inlet Cyclone Separator Abhijeet Gayakwad1 , Dr.Shivarudraiah2 1PG Student Department Of Mechanical Engineering, University Visvesvaraya College Of Engineering Bangalore, India 2Professor Department Of Mechanical Engineering, University Visvesvaraya College Of Engineering Bangalore, India ------------------------------------------------------------------------------***--------------------------------------------------------------------------- Abstract - Many industries are using the cyclone dust separators without any modifications for more than a century. The gas solid cyclone separator is widely used in industries. For predicting the cyclone performance in terms of velocity and pressure variation, a large number of computational study was conducted due to its much application in the industrial area. The simulation is carried out using computational fluid dynamics (CFD) for gas- particle flow with cyclone separator in one of the approaches. Most of the attention is focused on improving the cyclone performance parameters. Recently most of the studies focused on the geometric effect on the cyclone performance. In this paper the geometric effect on cyclone separator is studied with the creation of symmetrical tangential inlet cyclone separator and compared it with the classical cyclone separator. The results showed that the new geometric modification to the cyclone improves the performance. Key Words : Cyclone, CFD, Particle Flow, Symmetric inlet Separator. 1. INTRODUCTION The cyclone separators are widely used in the removal of dust particles from the gas flow in industrial processes. Cyclone dust separators have been used in industries to separate dust particles from the gas solid flow and intern reduce the air pollution occurring due to the chimney smoke in the chemical plant (Ogawa 1997). The cyclone separators are the most robust dust separators. In a classical cyclone separator the dust gas enters tangentially and forces the flow to follow spiral motion. Thus the created centrifugal force forces the dust particle towards the wall of the cyclone. After striking the wall of cyclone, the particles fell down and separated. In the new engineering applications the cyclone separators are used as reactors, dryers in petroleum industries to remove catalyst from the gases. The cyclone geometry is the most important parameter that affects the cyclone performance [8]. The solid dust particles are immediately bifurcated into two layers as soon it enters the cyclone due to the eddy currents generated in the coaxial space between the cyclone body and exit pipe. One of them goes upper surface around the coaxial space and rates with the gas flow around the exit pipe. The other layer rotates and descends down along the surface of the cyclone. Then in the cone surface the dust layers are pressed by the centrifugal force and descend down due to gravitational forces in the boundary layer. Lastly these dust layers are separated. However some of the dust rolls up due to the secondary air flow in the boundary and flows through the exit pipe. The centrifugal effect, which is responsible for separating the dust particles, depends on tangential velocity of particles. Therefore the tangential velocity must be increased to increase the cyclone efficiency because it relates to the pressure drop. 2. Cyclone Design 2.1 Geometry The cyclone geometry is constructed by using Stairmand’s high efficiency cyclone design method. Stairmand conducted so many experiments on the cyclone separator and finally developed the optimized geometrical ratios. By considering this geometric ratio’s the modelling of the cyclone done in catia V5. Take Dc=0.30 meter, which is comparatively safe as it is close to standard size diameter of 0.203 meter Thus, the dimension of the design cyclone is as under Stairmand’s design, Dc=diameter of cyclone=0.30 m Height of inlet duct Hi=0.5 Dc=0.5x0.3=0.15m Width of inlet duct=wi=0.2 Dc =0.2x0.30=0.06 m Diameter of out let duct=D0=0.5 Dc =0.5x0.3=0.15m Diameter of dust outlet Dd=0.375xDc =0.375x0.3=0.11m Length of cyclone main body (1.5Dc) =1.5x0.3=L1=0.45m Length of cyclone hopper = 2.5Dc=2.5x0.3=L2=0.75m Total length of cyclone=L1+L2=1.2m
  • 2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 914 Fig. 2.1.1 Cyclone Design 2.2 Geometry modification In order to increase the cyclone performance, tangential velocity must be increased. So in order to increase the cyclone tangential velocity an extra inlet symmetric to the standard cyclone design is added. With following design dimensions, Height of inlet duct Hi=0.5 Dc=0.5x0.3=0.15m Width of inlet duct wi=0.2 Dc =0.2x0.30=0.06 m Fig. 2.2.1 Single inlet cyclone design Fig. 2.2.2 Symmetrical inlet cyclone design 3. CFD ANALYSIS Import the cyclone design from the solid works. Open the design modeler. Click on generate the imported geometry appears. Select the part body in the tree outline .select the body click on the screen. Change the solid body into the fluid body. Close the design modular and save the project. 3.1 MESH Open mesh.>create named sections 1. Select the inlet face.name it as velocity inlet 2. Select the outlet face and name it as pressure outlet. 3. Select the rest of the faces and name them as wall. Select mesh in tree outline. In mesh details default conditions are set to be CFD and FLUENT solver as shown in the fig and fig . Give high smoothing condition and fine relevance. And change the transition slow to fast to reduce the no. of elements. Select mesh and click generate mesh to obtain mesh. Fig.3.1.1 Meshed Single cyclone separator
  • 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 915 Fig.3.1.2 Meshed Symmetric cyclone separator Mesh Properties Tabel 1. Mesh properties Single Inlet Symmetrical Inlet Nodes 5426 5484 Elements 25809 25791 3.2 SETUP Double click on the fluent set up to set the Simulation conditions. The software automatically recognizes the 3d dimension. The display mesh after reading, embed graphics windows and work bench colour scheme must be enabled. Enable the double precision and serial processing options. Then click ok to open the fluent. STEP 1: General > check mesh (To verify the mesh is correct or not) Enable pressure based type, absolute velocity formulation and transient time steps Fig.3.2.1 General Conditions STEP 2: In models select the realizable k-epsilon (2eqn) Model and RNG model with swirl dominated flow and standard wall functions. Fig.3.2.2 Defining the models Step 3 – DPM is set to on and create new injection for both the cyclones. The particles will enter from the inlet surface with 15m/s. Fig. 3.2.3 Defining the models Fig.3.2.4 Injection details
  • 4. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 916 Creating injections STEP 4: Boundary condition Velocity inlet> x-velocity=15m/s Fig.3.2.5 Inlet velocity boundary conditions Outlet Turbulence; specification method> Intensity and Viscosity ratio Backflow Turbulence kinetic energy= 5 m2/s2 Backflow Turbulence dissipation rate=10 m2/s3. Fig.3.2.6 Outlet boundary conditions 3.3 Solution Methods Fig.3.3.1 Details of solution methods STEP 5: Initialization: Select standard initialization and compute from inlet velocity Fig.3.3.2 Initialization conditions STEP 6: RUN> Check case>close Time step size(s) =1; Number of time steps =50; Max. Iterations = 555/ time step = 20 > calculate 4. SOLUTION Residuals Fig.4.1 Single Inlet cyclone separator Residual Graph Fig.4.2 Symmetrical Inlet Cyclone Separator Residual Graph
  • 5. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 917 The solution is converged at the 255th iteration. The vector fig.4.1 and fig.4.2 shows that the path followed by the fluid inside the cyclone. The flow follows swirl flow conditions as explained in the principle of the cyclone separator. The left side bar shows various velocity ranges. The colour obtained in the vectors show the variation of velocity at the different sections. The values of the velocity can be studied from the left side scale. 5.RESULTS AND DISCUSSIONS 5.1 CONTOUR RESULTS Pressure contours Pressure contours are plotted and it is observing that non- Dimensionalized static pressures are in the range of -22.98 to 248 respectively for single inlet cyclone. Static pressure is increasing from centre to wall surface but along the vertical section pressure is not uniform, it is decreasing at the bottom of the cone section of the cyclone as in case of single inlet cyclone separator. Fig.5.1.1 Static pressure contour of single inlet cyclone Pressure contours are plotted and it is observing that non- Dimensionalized static pressures are in the range of -133 to 567 respectively for symmetric inlet cyclone. The static pressure is increasing from centre to the wall. The static pressure in uniform throughout the cyclone body as compared to the single inlet cyclone separator. Fig.5.1.2 Static pressure contour for symmetrical inlet cyclone 5.2 VELOCITYpVECTORS Table. 2 Velocity magnitude Velocity magnitudes Fig.5.2.1 Velocity Magnitude Single Inlet Fig.5.2.2 Velocity Magnitude Symmetrical Inlet As we can see from the Fig.5.2.1 and Fig.5.2.2 the velocity magnitude is increasing from centre to the wall of the
  • 6. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 918 cyclone in both geometry. But the velocity is decreasing from top to the bottom of the cyclone in single inlet cyclone. The velocity magnitude is uniform almost uniform from the top to bottom of the cyclone in symmetrical inlet cyclone. Which gives better collection efficiency to the cyclone. Tangential velocity vector Fig. 5.2.3 Tangential Velocity Single Inlet Cyclone Fig.5.2.4 Tangential Velocity Symmetrical Inlet Cyclone As we know that the tangential velocity of the gas flow, which relates to the pressure drop, must be increased in order to increase cyclone efficiency. From the data we can see that there is an increase in the tangential velocity in the symmetrical inlet cyclone as compared to single inlet cyclone. Particle traces coloured by particle residence time for Single Inlet Cyclone Fig.5.2.5 For single inlet cyclone Particle traces coloured by particle residence time for Symmetrical Inlet Cyclone – Fig.5.2.6 For symmetric cyclone 6. CONCLUSION The Computation Fluid Dynamics (CFD) analysis is carried out for both single inlet cyclone and symmetrical inlet cyclone separator under the same condition of inlet velocity, flow rate and particle diameter. The results
  • 7. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 919 showed that the pressure distribution is uniform on the symmetrical inlet cyclone, the tangential velocity which relates to the pressure drop, will be increased which accounts for the better cyclone efficiency. The collection efficiency for the modified cyclone geometry is more than the standard cyclone design. 1. The results of pressure contour show uniform distribution of pressure throughout the cyclone body as compared to the standard design. 2. The results of tangential velocity vector show an increase in the tangential velocity in the cyclone body. Maximum tangential velocity for the single cyclone design is 18 m/s, and for symmetrical cyclone design is 23 m/s. This shows an increase in the tangential velocity. 7. References 1. Ogawa, A. (1997). Mechanical Separation Process and Flow Patterns of Cyclone Dust Collectors. Ind. Applied Mech. Ver. , vol. 50, n. 3, p. 97. 2. Ogawa, A. and Hikichi, T. (1981). Theory of CutSize of a Rotary Flow Dust Collector, Bulletin JSME, vol. 24, n. 188, p. 340. 3. Ogawa, A. (1984). Estimation of the Collection Efficiencies of the Three Types of the Cyclones Dust Collectors from the Standpoint of the Flow Patterns in the Cylindrical Cyclone Dust Collectors. Bulletin of JSME, vol. 27, n. 223, p. 64. 4. Stairmand, C.J. (1951).The Design and Performance of Cyclone Separators. Trans. Inst. Chem. Eng., vol. 29, p. 356. 5. Zhao, B., Shen, H. and Kang, Y. (2004). Development of a Symmetrical Spiral Inlet to Improve Cyclone Separator Performance. Powder Technology, vol. 145, issue 1, pp. 4750. 6. Cyclone Collection Efficiency: Comparison of Experimental Results with Theoretical Predictions By John Dirgo & David Leith 7. Bernardo S, Peres A P and Mori M (2005),“Computational Study of Cyclone Flow Fluid Dynamics using a Different Inlet Section Angle”, Thermal Engineering (RETERM). 8. Bernardo S, Mori M and W P Martignoni (2006), “Evaluation of Cyclone Geometry and its Influence on its Performance Parameters by CFD”, Powder Technology. 9. Lapple C E (1951), “Process Use Many Collector Types”, Chemical Engineering.