摘要
反映流体中能量和动量迁移过程相互影响的无因次组合数———普朗特数，在热力计算中具有重要的作用．作者从分子运动理论角度出发，对普朗特数进行了分析．通过氩、氮和水蒸气３种常见物质的普朗特数的变化情况，对普朗特数的一些基本变化规律进行了初步研究，并提出了适用于这３种物质的普朗特数变化规律的经验公式．
Prandtl number reflects the effect of energy and momentum transport in fluid; it has been frequently used in thermodynamic and hoat transfer computation. Based on the kinetic molecular theory, the Prandtl number can be related to the intermolecular force. An empirical relation is presented for its variation in argon, nitrogen and water. This study shows that for gas in a dilute state, the Prandtl number is nearly constant; while in a dense state it varies as a function of intermolecular force.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1999年第1期77-80,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金
