Abstract
This chapter provides an overview of the available literature on the modeling of condensation in microchannels. Microchannel definitions and governing influences, flow regimes and transition criteria, void fraction correlations, pressure drop, and heat transfer are also discussed in the chapter. The building blocks for the modeling of condensation in microchannels are slowly becoming available. The progress on addressing microchannel flows in the area of flow regime determination is documented in adiabatic and condensing flows in mini channels. The Wilson plot techniques used for large channels are limited in their utility for small channels. Controlled experiments measure heat transfer rates of the order of a few watts for local condensation in microchannels. Models for heat transfer coefficients reflect the cumulative effects of reliable or unreliable establishment of flow regimes, modeling of void fractions, the computation of the shear stress through a pressure drop, and uncertainties in the measurement of heat transfer coefficients. Microchannels are increasingly being used in industry to yield compact geometries for heat transfer in a wide variety of applications.
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