关于热力学、热量传递和质量传递,以及流体工程的 A-Z 指南
中文 English Русский Português Español Français Deutsch 关于我们 编辑 联系我们 访问 Begell House
View in A-Z Index

Peclet number, Pe, is a dimensionless group representing the ratio of heat transfer by motion of a fluid to heat transfer by thermal conduction.

where u is fluid velocity, L is a characteristic dimension, and k is thermal diffusivity of the fluid. Re is Reynolds Number and Pr is Prandtl Number.

Heat transported by the fluid per unit area is proportional to uρcp where ρ is density and cp is specific heat capacity, while heat conducted per unit area is proportional to λ/L where λ is thermal conductivity. Hence

Peclet number for mass transfer has the corresponding form

where δ is diffusivity and Sc is Schmidt Number.

浏览次数: 67756 创建日期: 2 February 2011 最后修改日期: 4 February 2011 © Copyright 2010-2021 返回顶部
A-Z 索引 作者/编辑 语义地图 视觉画廊 贡献 Guest