Modes of Heat Transfer
Basic Heat Transfer Phenomena
• Phase Change
The Energy Equation
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
• 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
• Transition to turbulent flow
• Turbulent flows
• Modelling tips
• Model setup in FLUENT
Radiation Heat Transfer
• Radiation modelling theory
• Radiation models in FLUENT
• Surface-to-Surface (S2S)
• Discrete Ordinates (DO)
• Discrete Transfer Radiation Model (DTRM)
• Selecting a radiation model
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 are widely used in industry and need to be taken into account in many CFD calculations
Heat Transfer in Porous Media
• Industrial examples
• Fuel cells
• Catalytic converters
• 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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