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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

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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.