Introduction to CFX -Heat Transfer

Conservation Equations

•Heat transfer in a fluid domain is governed by the Energy Transport Equation:

•The Heat Transfer Model relates to the above equation as follows

–None: Energy Transport Equation not solved

–Isothermal: The Energy Transport Equation is not solved but a temperature is required to evaluated fluid properties (e.g. when using an Ideal Gas)

–Thermal Energy: An Energy Transport Equation is solved which neglects variable density effects.  It is suitable for low speed liquid flow with constant specific heats.  An optional viscous dissipation term can be included if viscous heating is significant.

–Total Energy:  This models the transport of enthalpy and includes kinetic energy effects.  It should be used for gas flows where the Mach number exceeds 0.2, and high speed liquid flows where viscous heating effects arise in the boundary layer, where kinetic energy effects become significant.

•For multicomponent flows, reacting flows and radiation modeling additional terms are included in the energy equation

•Heat transfer in a solid domain is modeled using the following conduction equation 

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