pr ratio 中文意思是什麼

pr ratio 解釋
泵減速比
  • pr : PR ＝public relations （通過宣傳手段建立的）與公眾的聯系，對外聯絡；公關；公關人士。Pr ＝praseodymium 【化學】鐠。
  • ratio : n. （pl. ratios）1. 比，比率，比值；比例；系數。2. 【經濟學】復本位制中金銀的法定比價。vt. 1. 用比例方式表達；求出…的比值；使…成比例。2. 將（相片）按比例放大或縮小。
  1. When pr / sc is a constant, the value of buoyancy ratio bmin decrease with the increasing inclination angle

    B _ （ min ）的值則隨傾斜角度的減小而增大。
  2. The characteristic of combined heat and mass transfer by natural convection has been the focus of researches for a long time. numerical analysis is conducted for combined heat transfer and mass transfer by natural convection on inclined surface. effects of the inclination angle and the ratio of buoyancies due to heat diffusion and mass diffusion on fluid flow and heat and mass transfer characteristics have been investigated for pr = 0. 7 and sc = 0. 05 - 5. 0

    本文採用數值計算方法研究了傾斜平面上的傳熱傳質復合自然對流，求解了動量、能量及質量的完整方程，考察了熱質擴散共存時傾斜平面上的流動和傳熱特性，著重分析了熱浮力及物質擴散浮力之比b和傾斜角度對流體流動和傳熱傳質特性的影響。
  3. The nusselt and sherwood numbers increase with the increasing buoyancy ratio of b. when b reaches bmin, nusselt and sherwood numbers are attained minimum. the value of buoyancy ratio bmin which is a function of pr / sc increase with the increasing pr / sc and bmin varies drastically when 0 < pr / sc < 2

    流體速度和熱質傳遞速度出現最小值時即nusselt數和sherwood數為最小值時的浮力比為b _ （ min ） ，它是普朗特數和施米特數之比pr / sc的函數，隨pr / sc的增大而增大。
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