The objective of this study is to understand the mixing elbow problem.
• Calculate Velocity distribution over bend pipe.
• Calculate Temperature destruction between fluids.
• Calculate and understand pressure distribution over bend
3. www.engineeringwithsandeep.com| Student Assignment
As shown in the picture, has following boundary conditions are used during the simulation.
Boundary Name Temperature Velocity
Inlet 1 100°C 50 m/s
Inlet 2 70°C 30 m/s
• The main object is to understand
temperature velcotiy and pressure after
• Pressure is 1 atm.
• Working fluid is water.
• Walls are Adiabatic.
7. www.engineeringwithsandeep.com| Student Assignment
Image 8 Image 8.1
• Image 6 and image 6.1 show,inlet2 is velocity decreases due to friction of pipe wall. When inlet1 has more
velocity than inlet2, this makes increases velocity suddenly.
• Image 7 and image 7.1 shows that,inlet2 temp are more then compare to inlet1 , it makes decreases in
temp due to mixing.
• Fluid is not fully mixed .
9. www.engineeringwithsandeep.com| Student Assignment
During this analysis there is two main problems have been seen:
•Mixing is not Proper
•To solve this we could increase the inlet1 diameter.
•We can also change the location of inlet1.
Temperature distribution is not homogenous
•To solve this problem improving mixing will also help.
•We can use external cooling to balance the temperature.
10. www.engineeringwithsandeep.com| Student Assignment
• During simulation, it is clear that the velocity at the outlet (nearly 37 m/s ) is more compare to inlet2 (30
m/s) and less than inlet1 (50 m/s). This is a correct observation according to theory.
• Inlet 2 temp. is 70°C and inlet 1 temp. 100°C, after mixing temp. at an outlet is nearly 79°C. This is also a
correct observation according to theory.
• Mixing is not good inside the section.
• Temperature is high in some places that may cause stress imbalance.
• If the fluid is hot then proper insulation must be used.