Abstract
Magnetohydrodynamic (MHD) micropump which is energy saving and less pollution has been widely investigated by researchers in recent years. Based on the finite element analysis (FEA) of numerical model of 3D MHD micropump, we investigated the comprehensive effects of Joule heating, electro-osmosis and slip condition at walls on flow performance. This paper presents a new method for solving the full 3D MHD equations by coupling multi-physics fields, and gives a more comprehensive analysis of fundamental principles of MHD micropump. The temperature distribution under different flow channel geometries, the electro-osmotic velocity in MHD micropump, and the influence of slip condition at walls on flow velocity are analyzed in detail. The flow velocity slightly increases when taking the effect of Joule heating into account. In addition, the flow velocity is hardly affected by electron-osmosis in this work. It should be pointed out that the mean temperature of MHD micropump decreases with driven voltage increasing. With the advantage of fast and accurate analysis of MHD micropump performance, this study holds promising potential for the optimal design and fundamental research of MHD micropump.
Highlights
Microfluidic devices, such as lab-on-chip or micro-total analysis systems, have drawn significant attention in various fields for chemical synthesis,[1,2] biological analysis[3,4] and environmental monitoring.[5,6] Microfluidic devices generally integrate the functions of fluid flow control, mixing, filtration and reaction
When the aspect ratio is 5:3, the maximum flow velocity is in the center of channel and the performance is similar to electrokinetic flow
The obtained results showed that aspect ratio, Joule heating, slip condition at walls have significant influence on flow velocity and temperature distribution
Summary
Microfluidic devices, such as lab-on-chip or micro-total analysis systems (μTAS), have drawn significant attention in various fields for chemical synthesis,[1,2] biological analysis[3,4] and environmental monitoring.[5,6] Microfluidic devices generally integrate the functions of fluid flow control, mixing, filtration and reaction. As an inevitable component of lab-on-chip and micro-total analysis systems, micropump controls the flow of small-volume of fluid. The MHD micropump which has no moving parts is one of the important non-mechanical micropumps that allow lower driven voltage compared with electrokinetic micropumps, and has the unique ability of bidirectional flow controlling.[7] Base on the principle of right hand, the Lorentz force is produced when an electric current flows across the channel in the presence of a perpendicular magnetic field.[8] The Lorentz force points to the channel direction and drives fluid flow in microfluidic devices. Significant interest has been drawn on MHD micropump.
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