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Numerical studies of two-phase flow distribution in evaporators.

Author(s) : OLIET C., ABLANQUE N., RIGOLA J., et al.

Summary

This work focuses on the numerical simulation of the thermal and fluid-dynamic behaviour of the two-phase flow in-tube evaporating phenomena and the influence of the flow distribution through multiple parallel paths. A detailed one-dimensional numerical simulation model for the in-tube evaporation phenomena is presented. The discretized governing equations (continuity, momentum and energy) are coupled by means of a step-by-step algorithm, with special treatment considering gas-liquid transitions. All the flow variables (temperature, pressure, vapour weight fraction, gas and liquid velocities, etc.) are evaluated at each point of the grid in which the domain is discretized. In order to simulate not only a branch of a whole heat exchanger but also to study the influence of the flow distribution between multiple header-tube junctions at both inlet and outlet cross sections an extensive analysis of the different T-junction models from technical literature is presented. Finally, a numerical simulation model for the whole two-phase flow analysis in the heat exchanger is presented based on a global resolution algorithm of the header or manifold and each of the branches in which the heat exchanger is composed. A SIMPLE-like algorithm has been developed to solve the coupled continuity and momentum equation along the different T-junctions connections and their branches. First numerical illustrative results are presented in order to show the possibilities that this kind of numerical simulation models offers.

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Pages: ICR07-E1-1092

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Details

  • Original title: Numerical studies of two-phase flow distribution in evaporators.
  • Record ID : 2008-0565
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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