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0542-4123

Heat and mass transfer processes

Also listed as: תהליכי מעבר חום וחומר

Convective transport taken past the introductory course, with mass transfer added through the momentum-heat-mass analogy. The single most reusable course in the fluids group.

Semester
Semester B
Weekly hours
4h
Counts as
Core: fluids
Interest areas
Environment and energy · Flow and thermal design

Comes after

  • Fluid mechanics 1
  • Heat transfer

Opens up

What it covers

Formulation and laminar convection

  • Conservation equations: continuity, Navier–Stokes, energy, species
  • The boundary-layer approximation and where it stops being valid
  • Blasius flat plate, thermal boundary layer, Nu(Re, Pr)
  • The integral (von Kármán) method
  • Internal flow: entry length, constant heat flux against constant wall temperature
  • Correlations: Dittus–Boelter, Sieder–Tate, Gnielinski

Turbulence, phase change and mass transfer

  • Reynolds averaging, eddy viscosity and diffusivity, the law of the wall
  • Reynolds–Colburn analogy
  • Natural and mixed convection, Grashof and Rayleigh numbers, enclosures
  • Boiling curve, critical heat flux, Nusselt film condensation
  • Fick's law, convective mass transfer, Sherwood and Schmidt numbers
  • The heat and mass analogy, Lewis number, evaporative cooling

Heat exchangers

  • LMTD and effectiveness-NTU methods
  • Fouling and its effect on sizing
  • Compact heat-exchanger geometries
  • Radiation exchange, view factors, radiosity, where it matters

Results worth carrying out

  • Nusselt and Sherwood numbers

    Nu=hLk,Sh=hmLDAB\mathrm{Nu} = \frac{hL}{k}, \qquad \mathrm{Sh} = \frac{h_m L}{D_{AB}}

  • Lewis number

    Le=αDAB=ScPr\mathrm{Le} = \frac{\alpha}{D_{AB}} = \frac{\mathrm{Sc}}{\mathrm{Pr}}

  • Colburn analogy

    St Pr2/3=Cf2\mathrm{St}\,\mathrm{Pr}^{2/3} = \frac{C_f}{2}

  • Rayleigh number

    Ra=Gr Pr\mathrm{Ra} = \mathrm{Gr}\,\mathrm{Pr}

  • Heat-exchanger effectiveness

    ε=f(NTU, Cr),Cr=Cmin⁡Cmax⁡\varepsilon = f(\mathrm{NTU},\, C_r), \quad C_r = \frac{C_{\min}}{C_{\max}}

Figures worth knowing

  • Velocity and thermal boundary-layer profiles
  • Moody chart
  • Nukiyama pool-boiling curve
  • Effectiveness-NTU charts
  • View-factor charts

Quick answers

When is Heat and mass transfer processes taught?

Heat and mass transfer processes (0542-4123) is taught in Semester B (spring), 4 weekly hours. It counts toward “Core: fluids” in the Tel Aviv University Mechanical Engineering elective requirements.

What do I need before 0542-4123?

Before Heat and mass transfer processes you need: Fluid mechanics 1, Heat transfer.

What software is used in Heat and mass transfer processes?

Heat and mass transfer processes is normally taught with ANSYS Fluent, COMSOL, MATLAB, EES.

Which jobs does Heat and mass transfer processes prepare you for?

Heat and mass transfer processes is part of the preparation for these roles: CFD engineer, Thermal engineer, electronics cooling, Energy systems and power plant engineer.

Which interest areas include Heat and mass transfer processes?

Heat and mass transfer processes sits in these interest areas: Environment and energy, Flow and thermal design.

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The topic outlines are not official syllabi. The university publishes a catalogue blurb per course, not lecture-by-lecture material, so each outline describes what a course of that name, at those hours, with those prerequisites teaches at engineering schools generally, cross-checked against the standard textbook for the subject. Treat it as an informed map, not as a transcript of the lectures.