Heat Transfer Modeling using ANSYS Fluent


Modes of Heat Transfer
Basic Heat Transfer Phenomena
• Conduction
• Convection
• Radiation
• Phase Change
The Energy Equation
Boundary Conditions

Conduction Heat Transfer

• Heat transfer is energy in transit due to a temperature difference
• Conduction phenomenon:
• Energy is transported by basic carriers
• Fluids – molecules, atoms
• Solids – free electrons

Forced Convection

• Introduction – Heat Transfer Coefficient
• Laminar and Turbulent Boundary Layers
• Modelling Heat Transfer – The Reynolds Analogy
• Turbulence Modelling and Dynamic and Thermal Wall Functions
• Case Study – Modelling Heat Transfer for Non-Equilibrium and Complex Flows
• Post Processing

Natural Convection

• Theory/Definition
• Phenomena
• Transition to turbulent flow
• Turbulent flows
• Modelling tips
• Model setup in FLUENT
• Examples
• References

Radiation Heat Transfer

• Radiation modelling theory
• Radiation models in FLUENT
• Surface-to-Surface (S2S)
• Discrete Ordinates (DO)
• Discrete Transfer Radiation Model (DTRM)
• P-1
• Rosseland
• Selecting a radiation model
• Postprocessing
• Conclusions

Solar Load Model

• The Solar Load Model is not a stand-alone radiation model.
• Calculates radiation effects from the Sun’s rays entering the computational domain.
• Available for both steady and unsteady cases.
• Typical applications :
• Automotive climate control.
• Human comfort modeling in buildings.
• Two options are available
• Solar ray tracing using a tracing algorithm
• Discrete ordinates (DO) irradiation, providing a means to apply solar loads directly into the DO model.

Heat Exchangers

• Heat Exchangers are widely used in industry and need to be taken into account in many CFD calculations
• Boiler
• Condenser
• Radiators
• Coolers

Heat Transfer in Porous Media

• Industrial examples
• Fuel cells
• Catalytic converters
• Filters
• Food products
• Like in all multiphase or heterogeneous systems, transport phenomena are important.
• The focus of this presentation is mainly heat transfer by convection
• Introduction to the elementary representative volume concept
• Governing equations
• Closure model
• Two models for predicting porous media heat transfer
• One-equation model (local thermal equilibrium model)
• Two-equation model (non-equilibrium model)


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