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Skin-Friction Coefficient

  • De-Yi ShangEmail author
  • Liang-Cai Zhong
Chapter
Part of the Heat and Mass Transfer book series (HMT)

Abstract

Skin-friction coefficient is analyzed with consideration of variable physical properties. The skin velocity gradient is the only one unknown variable for evaluation of the skin-friction coefficient. Systems of numerical solutions on the skin velocity gradient are obtained with consideration of variable physical properties. They have theoretical and practical value due to consideration of coupled effect of variable physical properties. The skin velocity gradient (or skin-friction coefficient) depends on local Prandtl numbers \(Pr_{w}\) and \(Pr_{\infty }\), as well as the local mixed convection parameter \(Mc_{x,\infty }\). The former is used for demonstration of the effect of variable physical properties on velocity fields as well as skin-friction coefficient. The latter reflects the effect of buoyancy force. The skin velocity gradient will increase with increasing local Prandtl number \(Pr_{\infty }\) and will decrease with increasing local Prandtl number \(Pr_{w}\). The skin velocity gradient will increase with increasing the local mixed convection parameter. On the other hand, with increasing the local mixed convection parameter, the effect of the local Prandtl numbers \(Pr_{w}\) and \(Pr_{{\infty }}\) on the skin velocity gradient will be stranger and stranger.

Keywords

Skin velocity gradient Skin-friction coefficient Local Prandtl number Local mixed convection parameter Variable physical properties 

Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.OttawaCanada
  2. 2.Department of Ferrous MetallurgyNortheastern UniversityShenyangChina

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