Internal flow mass transfer
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Internal Flow: Mass Transfer. Chapter 8 Section 8.9. Convection mass transfer occurs for gas flow through a tube whose inner surface is coated with a volatile liquid (evaporation) or solid (sublimation) and characterized by a uniform concentration, . General Considerations.

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Internal Flow: Mass Transfer

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Internal flow mass transfer

Internal Flow:Mass Transfer

Chapter 8

Section 8.9


General

  • Convection mass transfer occurs for gas flow through a tube whose inner

  • surface is coated with a volatile liquid (evaporation) or solid (sublimation) and

  • characterized by a uniform concentration, .

General Considerations

General

  • A species concentration boundary layer develops in an entry region and a fully

  • developed condition is eventually reached.

  • The mean species concentration is


Transfer rates

Species Transfer Rates

Transfer Rates

  • Local Species Mass Flux:

  • Longitudinal Distribution of Mean Species Concentration:

Applying conservation of species to a differential control volume in the tube,

the following expression may be obtained (Problem 8.107).


Transfer rates1

Total mass flow rate.

Total mass density.

Transfer Rates

  • Species Transfer Rate:


Convection coefficients

Convection Coefficients

Convection Mass Transfer Coefficients

Obtained by analogy to heat transfer correlations for internal flow:


Problem air flow through wetted tube

Problem: Air Flow through Wetted Tube

Problem 8.108: Evaporation rate and outlet vapor density for airflow

through wetted circular tube.


Problem air flow through wetted tube cont

Problem: Air Flow through Wetted Tube (cont)


Problem air flow through wetted tube cont1

Problem: Air Flow through Wetted Tube (cont)


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