newton's law of cooling fourier law heat conduction natural convection turbulent flow laminar flow transition flow applied mathematics pouiselle flow thermal conductivity free convection theoretical physics toricelli flow heat transfer coefficient viscosity l'hopitals rule hyperbolic functions radial heat conduction fourier's law integral heat equation integral equation no heat convection steady state transient state thermal diffusivity l'hopital's rule stoke's drag terminal velocity toriccelli flow bernoulli equation oxygen burning candle combustion gravity heat combustion viscous flow convection radiation stefan boltzmann law
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