Overall Driving Forces and Mass Transfer Coefficients

6 Overall Driving Forces and Mass Transfer Coefficients 

We start by noting that the slope of fhe line AD is given by the ratio AC/ CD and hence, by virtue of Equation 1.20, 

Mass and Heat Transfer Parameters for Two-Phase Transport 

Items listed are based on mole fraction concentration units. For conversion to other units, see Table 1.3. 

Similarly, we have for the local slope of the equilibrium curve 

It contains an equilibrium curve, which is generally nonlinear but is assumed to contain a short segment BE which is considered linear. Also indicated on the diagram are the various film and overall driving forces. For the gas phase, AC represents the film driving force J/av arid the distance AE equals the overall gas-phase driving force J/a  

The overall driving force y - y is given by the siun of the two segments AC and CE  

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