Abstract
In previous chapters, the fluid flow and conjugate heat and mass transfer processes are solved and discussed. The Nusselt and Sherwood numbers are calculated to estimate the performance. However, the procedures are highly reliant on detailed numerical schemes to solve partial differential equations. For more universal solutions, in this chapter, in analogy to sensible heat exchangers, simple effectiveness number of transfer units (NTU) correlations are proposed to estimate the sensible and mass transfer effectiveness of various heat and mass transfer processes. The dimensionless parameters in the correlations, which reflect the influencing factors of materials, operating conditions, as well as the interactions between them, are used to summarize the transport mechanisms in these processes. The set of partial differential equations, which are always coupled together, is transformed into two independent algebraic formulae. The benefits with these techniques are that they are simple, and can be conveniently used in engineering design.
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