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A critical review of analytical and numerical models of condensation in microchannels.

Author(s) : KENIAR K., EL FIL B., GARIMELLA S.

Type of article: IJR article, Review

Summary

Understanding condensation in microchannels is critical for designing optimized and compact microchannel condensers, which have the potential to increase system level efficiency and reduce system size. Analytical and numerical models can yield insights into local condensation phenomena. This study provides a review of models of condensation in microchannels. These models are categorized based on the applicable, typically annular and intermittent, flow regimes. Annular-flow-based models are further subdivided into analytical models with closed-form solutions, analytical models with numerical solutions, reduced-order CFD models, and full-fledged CFD models. Intermittent-flow-based models are subdivided into single-bubble, repeated-unit-cell, and overall-bubble-train models. The characteristics, use, and range of applicability of each of these models is highlighted. A criterion for the film Reynolds number is proposed for internal forced convective condensation in microchannels, to assess the validity of the modeling assumptions. Annular flow models using the laminar film assumption appear to be valid for Reδ0 < ~ 360, beyond which turbulent effects must be modeled. Intermittent flow models using the laminar film assumption, in turn, appear to be valid for Reδ0 < ~ 130.

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Pages: 314-330

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Details

  • Original title: A critical review of analytical and numerical models of condensation in microchannels.
  • Record ID : 30027833
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 120
  • Publication date: 2020/12
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.08.009
  • Document available for consultation in the library of the IIR headquarters only.

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