UE3 - Transfer Phenomena

Chapter  1. Introduction , convection regimes, Newton's law, range of h values, factors involved in the calculation of h, boundary layer, general formulation, Nusselt number, local quantities and mean quantities

Chapter 2. External forced convection - Boundary layer, flat plate in laminar regime, resolution of conservation equations in the Prandtl hypothesis, flate plate in turbulent regime, flow around a sheet of tubes

Chapter 3. Internal forced convection -  Fully developed flow regime, inlet length, laminar flow in a tube, turbulent flow in a tube

Chapter 4. Natural convection    - Coefficient of thermal expansion. Buoyancy force. Grashof and Rayleigh numbers Boundary layer. Vertical and horizontal plates - Cylinders

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This course consists of 2 parts: 1) Two-phase heat transfer, 2) Matter transfer

1) Two-phase heat transfer 6CM, 4TD, 4TP

• introduction to the physical mechanisms of phase change
• boiling: Nukyama curve, nucleate and film boiling, critical flows, two-phase flows
• condensation: physical mechanisms, laminar and turbulent condensation, flat-plate and tube condensation
• heat exchange intensification, examples of two-phase heat exchangers

2) Mass transfer, 6CM, 4TD, 4TP

• Lecture 1: Mass Transfer
      Introduction
          Objectives
          Bibliography
          Review
      Quantifying Energy and Matter
          Mass and Energy Balances
          Mixture of Components
          Flux Density for Binary Mixtures
          Mass Diffusivity or Diffusion Coefficient
      Fluid Flow Problems
          Definitions
          Expression of Mass Fluxes
          Summary
      Transient Regime
          Formulation
          Heat-Mass Analogy
      Exercise

• Lecture 2: Mass Transfer - Boundary Conditions
      Gas/Liquid Equilibrium
          Henry's Law
          Raoult's Law
      Gas/Solid Equilibrium
          Solubility
          Sorption
          Sorption Isotherm
      Boundary Conditions
          Introduction to the Problem
          Continuity of Variables
• Lecture 3: Heat-Mass Analogies
      Boundary Layer Analogy
          Heat Convection/Mass Convection
          Lewis Number
          Synthesis
      Evaporation
          Convection and Evaporation
          Link between Heat and Mass Fluxes
      Thermal-Mass Equivalence

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The plan of the course is :

1/ Introduction to Heat exchangers
    Introduction
        Heat exchanger principle
        Classification
    Heat transfer basics
        Thermal Resistance
        Fins
    Exercices
        Engine
        Fuel Cell

2/ Log Mean Temperature Difference
    Energy balance on a single tube
        Energy balance
        One tube calculations
    Heat exchanger
        Overall energy balance
        Parallel flow heat exchanger
        Counterflow heat exchanger

3/ The Effectiveness¿NTU Method
    Effectiveness
        Definition
        Ideal counterflow heat exchanger
        Function of the cold or hot side
    NTU
        Definition
        Example of parallel flow heat-exchanger
        Conclusion for PF heat-exchanger
        Expressions for a variety of heat exchangers

4/ Heat Exchangers grids
    Introduction
    Series architecture
        Architecture ?
        Temperature ratio
        Effectiveness
        NTU
    Parrallel - series architecture
        Cold fluid in parallel and hot fluid in series
        Hot fluid in parallel and cold fluid in series

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