The Theory Research Based On The MHD Microfluidic Drive Technology

Microfluidic technology research is one of the frontier areas of science and technology in current world, how to efficiently drive the fluid in the groove is the key of it’s development. Among the commonly used driving force, the MHD drive is a technology based on the conductive liquid flow in the electromagnetic field and the motion state changes by lorentz force, because of it’s unique advantages of simple structure, reversible pump and low operating voltage, it catches the attention. The main part for MHD drive research of this stage is scientific experiments, because of the MHD drive technology involving the electric field, magnetic field and multi-physics coupling of flow field, the numerical simulation analysis is difficult. In order to do further research and application of MHD drive technology, the numerical simulation become the current problems to solve.This research object is based on MHD drive technology in the application of microfluidic driving simulation, completed the basic theoretical analysis, and by means of numerical software set up different scales, different port configuration of MHD drive physical model, and calculated out the drive data, as well as the electric field, magnetic field in the runner and the distribution of flow field and relevant physical parameters. Solves the difficulties of the electric field, magnetic field abstract and invisible, verify the numerical simulation is reasonable, provides a powerful means of auxiliary and validation for further optimize the MHD drive device design, is sure to promote the engineering application of MHD propulsion technology.In this article first analyzes the basic theory of MHD microfluidic drive technology, establish the mathematical model under the ideal conditions, deduce the DC and AC MHD drive force equations, get the specific relational expression about the electric field, magnetic field and the flow field. Second by reference to specific experimental unit, use the Comsol Multiphysics to simulate the MHD drive, consistent with the real physical model, set parametersand obtained evaluation arithmetic flow passage the distribution of magnetic field, electric field and flow field, get the fluid flow velocity under different parameters. Results show that under the DC 8 voltage, magnetic field intensity is 0.5T, the velocity is 0.8 mm/s, the experimental rate is 0.68 mm/s, similar with the experimental data, verify the numerical simulation is a effective solution. Finaly take the application of the MHD drive technology in the microfluidic devices as the target, choice rectangular and trapezoidal channel usual in microfluidic device design, establish the micron physical model, study the physical model of electric field, magnetic field and flow field and relevant physical parameters, provides reference for the subsequent MHD microfluidic drive device applly research.