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Free Convection: Mass Transfer

Free Convection: Mass Transfer. Chapter 9 Section 9.10. Mass Transfer. Mass Transfer. The heat and mass transfer analogy may be invoked if temperature-dependent density variations are negligible relative to density variations associated with species concentration gradients.

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Free Convection: Mass Transfer

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  1. Free Convection: Mass Transfer Chapter 9 Section 9.10

  2. Mass Transfer Mass Transfer • The heat and mass transfer analogy may be invoked if temperature-dependent • density variations are negligible relative to density variations associated with • species concentration gradients. In such cases,

  3. Horizontal Plate: Mass Transfer (cont) • Representative Mass Transfer Correlations: Vertical Plate: • Consider transport of species A from a horizontal surface facing upward • in a quiescent fluid B. If the molecular weight of A is less than that of B, what is the analogous heat transfer problem? If the molecular weight of A exceeds that of B, what is the analogous heat transfer problem? • If conditions are characterized by both temperature and concentration gradients, • how may convection heat and mass transfer coefficients be calculated to a • first approximation?

  4. Problem: Garment Drying Problem 9.113: Determination of drying rate per unit width of a garment hanging in dry air.

  5. Problem: Garment Drying (cont)

  6. Problem: Garment Drying (cont)

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