NUMERICAL STUDIES OF TWO-PHASE FLOW DISTRIBUTION IN EVAPORATORS
The present work is focused 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.
C.OLIET N.ABLANQUE J.RIGOLA C.D.P(E)REZ-SEGARRA A.OLIVA
Centre Tecnològic de Transferència de Calor (CTTC),Universitat Politècnica de Catalunya (UPC),C/ Colom, 11, Terrassa, E-08222, Spain
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）