A Numerical Analysis on Freezing Behavior of Flowing Water inside a Pipe Cooled from Surroundings

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  • CHIBA Ryoichi
    Department of Mechanical Engineering, Miyagi National College of Technology
  • IZUMI Masaaki
    Department of Mechanical Engineering, Ishinomaki Sensyu University

Bibliographic Information

Other Title
  • 周囲から冷却される円管内を流れる水の凍結挙動解析
  • 周囲から冷却される円管内を流れる水の凍結挙動解析--凍結回避のための限界流速と氷による管閉塞時間
  • シュウイ カラ レイキャク サレル エン カンナイ オ ナガレルミズ ノ トウケツ キョドウ カイセキ トウケツ カイヒ ノ タメ ノ ゲンカイ リュウソク ト コオリ ニ ヨル カン ヘイソク ジカン
  • - 凍結回避のための限界流速と氷による管閉塞時間 -
  • -Critical Velocity of Water Flow to Avoid Freezing and Period Required for Ice to Blockade a Pipe-

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Abstract

A freezing phenomenon in forced convectional flow inside a pipe is investigated numerically in this paper .The numerical analysis is carried out to assess the transient freezing behavior of flowing water inside a pipe cooled from surroundings in consideration of pressure drop caused by the freezing. The finite element technique is applied to solve the equations of motion and energy transport for laminar flow. The numerical model attempts to capture the solid-fluid interface on a fixed computational grid. The correlations among cooling conditions of pipe, velocity and temperature of water at the inlet, and location at which the freezing starts are examined to show the critical velocity to avoid freezing. In addition, under the condition that pressure remains constant at the inlet, the period in which the pipe is not blockaded by ice is calculated. The period is illustrated with some dimensionless parameters to predict the conditions under which blockage occurs within a given time.

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