Research on Two-phase Flow Distribution in a Vertical Multi-branch Header

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  • MATSUMOTO Takashi
    Advanced Technology R&D Center, Mitsubishi Electric Corporation
  • ONAKA Yoji
    Advanced Technology R&D Center, Mitsubishi Electric Corporation
  • YAMASHITA Koji
    Air-Conditioning & Refrigeration Systems Div., Mitsubishi Electric Corporation

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Other Title
  • 多分岐な垂直ヘッダ型分配器における気液二相冷媒分配
  • 多分岐な垂直ヘッダ型分配器における気液二相冷媒分配 : 液冷媒上部不到達条件を含む分配特性予測手法の検討
  • タブンキ ナ スイチョク ヘッダガタ ブンパイキ ニ オケル キエキ ニソウレイバイブンパイ : エキレイバイ ジョウブ フトウタツ ジョウケン オ フクム ブンパイ トクセイ ヨソク シュホウ ノ ケントウ
  • －Numerical Simulation of Maldistribution and Liquid Reverse Flow condition－
  • －液冷媒上部不到達条件を含む分配特性予測手法の検討－

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Abstract

<p>Authors applied one dimensional computational model of Watanabe and Katsuta 5 branch headers to the shunt characteristics of vertical header type distributor with more than 30 branches which we clarified in the experiment and verified the accuracy and calculation time and further LBL (Liquid Branch Limit) model was newly studied using the flood reduction formula in order to predict the splitting characteristics at the time when the liquid refrigerant failed to reach the upper part of the header important for equipment design. As a result, even in the header exceeding 30 branches, the Watanabe model predicts the liquid refrigerant flow distribution characteristics in the range of deviation 0 to -0.6, and the calculation time is less than 10 minutes and it was confirmed to be industrially effective. By applying the LBL model, it is possible to predict the liquid refrigerant arrival height ratio to be ± 20 points and the liquid refrigerant flow deviation within ± 0.2, and the refrigeration flow distribution prediction accuracy under the liquid refrigerant unreachable condition is improved compared with the conventional method. </p><p></p><p></p>

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