Thermally Developing Flow Induced by Electro-Osmosis in a Circular Micro-Channel

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• 作者：Ali Jabari Moghadam (1)
  
• 关键词：Electro ; osmotic flow ; Thermally developing region ; Circular micro ; channel ; Plug ; like velocity profile ; Nusselt number
• 刊名：Arabian Journal for Science and Engineering
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：39
• 期：2
• 页码：1261-1270
• 全文大小：646 KB
• 作者单位：Ali Jabari Moghadam (1)
  
  1. Department of Mechanical Engineering, Shahrood University of Technology, Post Box 316, Shahrood, Iran
  

文摘

The steady-state electro-kinetic-driven flow and heat transfer in circular micro-channels are studied under hydrodynamic fully developed and thermally developing conditions. Based on the linearized Poisson–Boltzmann equation, an exact solution of the electrical potential distribution is obtained. The analytic solutions of the velocity and temperature profiles are then obtained, and the effects of some hydrodynamic and thermal parameters on flow and heat transfer are investigated. The interesting plug-like velocity profile produced by external electrical field is not usually observed in the pressure-driven flows. In this case, the very large velocity gradient near the wall of the micro-channel may result in the enhanced temperature close to the wall (depending on the relative importance of viscous dissipation compared with the other terms); the temperature values of other portions of the flow field are increased slightly. Decreasing both Reynolds and Prandtl numbers leads to increasing the bulk fluid temperature. Nusselt number decreases in the thermally developing region.