Introduction

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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