Analytical solutions of Nusselt number for thermally fully developed flow in microtubes under a combined action of electroosmotic forces and imposed pressure gradients
Analytical solutions of Nusselt number for thermally fully developed flow in microtubes under a combined action of electroosmotic forces and imposed pressure gradients
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DOI：
10.1016/j.ijheatmasstransfer.2005.07.048
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发表时间：
2006-02-01
影响因子：
5.2
通讯作者：
Chakraborty, S
中科院分区：
文献类型：
--
作者：
Chakraborty, S
封闭形式的表达式开发的努塞尔数的变化在热充分发展的微管流，在电渗力和施加的压力梯度的综合影响下。该分析考虑了压力驱动对流和焦耳热效应之间的相互作用，以获得相关的传热速率。虽然单独的限制条件上的渐近努塞尔数可以得到纯电渗和单独的压力驱动的流量，相对影响的电势梯度和施加的压力梯度串联作用也进行了严格的分析，作为一个函数的管半径相对于德拜长度归一化。显着的见解也开发了关于不利的压力梯度对热传输的影响，在存在协助电渗效应。(c)2005爱思唯尔有限公司保留所有权利。
Closed form expressions are developed for Nusselt number variation in a thermally fully developed microtube flow, under a combined influence of electroosmotic forces and imposed pressure gradients. The analysis takes care of the interaction amongst pressure driven convection and Joule heating effects, in order to obtain the pertinent rate of heat transfer. While separate limiting conditions on the asymptotic Nusselt number can be obtained for pure electroosmotic and solely pressure driven flows, relative influences of electrical potential gradients and imposed pressure gradients acting in tandem are also critically analyzed, as a function of the tube radius normalized with respect to the Debye length. Significant insights are also developed regarding the influence of adverse pressure gradients on the thermal transport, in presence of aiding electroosmotic effects. (c) 2005 Elsevier Ltd. All rights reserved.