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1 International Journal of Applied Mechanics and Engineering

1 2002

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Effects of the characteristic parameters of micropolar flows in a micro-slot between rotating surfaces of revolution

Kim Y. J., Choi G. W., Walicka A., Walicki E.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

81-86

Micron-size mechanical devices are becoming more prevalent, both in commercial applications and in scientific inquiry. Within the last decade, a dramatic increase in research activities has taken place, mostly due to the rapidly expanding growth of applications in areas of MEMS, bioengineering, chemical systems, and advanced energy systems. The effects of vortex viscosity variation on the flow fields in a micro-slot between the rotating surfaces of revolution are studied, using a micropolar fluid theory. In order to solve this problem, we have used boundary layer equations and applied non-zero values of the micro-rotation vector on the wall. The results are compared with the corresponding flow problems for Newtonian fluid. Results show that the coefficient d, the ratio of the vortex viscosity coefficient to the shear viscosity coefficient, has an important effect on the streamwise velocity . Also, the coefficient m, a combination of vortex and spin gradient viscosity coefficients, controls the main part of micro-rotation component.