Thermal transport of magnetohydrodynamic electroosmotic flow in circular cylindrical microchannels
Thermal transport of magnetohydrodynamic electroosmotic flow in circular cylindrical microchannels
复制标题
圆柱形微通道中磁流体动力电渗流的热传输
DOI：
10.1016/j.ijheatmasstransfer.2017.11.026
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
Li Feng Qin
中科院分区：
文献类型：
--
作者：
Xie Zhi Yong;Jian Yong Jun;Li Feng Qin
研究了圆柱形微通道内磁流体电渗流的热输运现象。流体流动可以通过施加的压力梯度、电渗和附加电磁场的相互作用来驱动。在适当的假设下，可以得到无量纲流速的分布。基于获得的速度场，传热特性，解释的无量纲温度和努塞尔数，讨论了图形考虑粘性耗散和焦耳加热的影响下，恒定的壁面热流的情况下。结果表明，在没有横向电场的情况下，随着Hartmann数的增加，流动速度减小，无量纲温度降低，最终导致Nusselt数增加。但由于横向电场的存在，无量纲流速、无量纲温度和Nusselt数的分布被划分为两个区域，且在不同区域之间呈现出相反的趋势。本奋进可用于设计精密高效的电磁器件，特别是在特定的热传输特性范围内。
Thermal transport phenomena of magnetohydrodynamic electroosmotic flow are investigated through a circular cylindrical microchannel. The fluid flow can be actuated by the interactions of imposed pressure-gradient, electroosmosis and additional electromagnetic field. Under the appropriate assumptions, the distributions of the non-dimensional flow velocity can be obtained. Based upon the achieved velocity field, heat transfer characteristics, explained by the non-dimensional temperature and Nusselt number, are discussed graphically by taking into account the effects of viscous dissipation and Joule heating under the constant wall heat flux circumstance. Concisely, the results show, in the absence of lateral electric field, the flow velocity decreases with the increasing magnitudes of Hartmann number resulting in the decrease of non-dimensional temperature, which ultimately culminates in increasing the Nusselt number. However, the profiles of non-dimensional flow velocity, non-dimensional temperature and Nusselt number are demarcated into two regions based on the value of critical Hartmann number and exhibit an adverse trend among different regions due to the existence of lateral electric field. The present endeavor can be utilized to design the exquisite and efficient electromagnetic devices, especially within a specific regime of thermal transport characteristics.