コルバーンのJ因子

コルバーンのJ因子(コルバーンのジェーいんし)は流体力学熱力学に登場する無次元数。境膜での熱・物質・運動量移動についての物理量である。Allan Philip Colburnらが提案した。単にj因子ともいう。以下の公式で求められる[1][2]

ただし、はJ因子、は熱の移動についてのスタントン数プラントル数ヌセルト数レイノルズ数を表す。円管内で流体が混流している場所でのJ因子は、流体の圧損失についての摩擦係数の半分になることが知られている。

脚注

  1. ^ j因子」『化学辞典 第2版』https://kotobank.jp/word/%7B%7B%7Bword%7D%7D%7Dコトバンクより2022年9月5日閲覧 
  2. ^ 日本機械学会. “コルバーンのj因子”. 機械工学事典. 2022年9月5日閲覧。

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