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

• Autorzy: Kim Y. J. , Choi G. W. , Walicka A. , Walicki E.
• Konferencja: Second International Tribology Conference
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

micropolar fluid; microrotation; micro-slot; Vortex viscosity

PL

hydromechanika; płyn mikropolarny; lepkość

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, Spec. is
• Strony: 81--86
• Opis fizyczny: Bibliogr. 8 poz., wykr.

Twórcy

autor

Kim Y. J.

• School of Mechanical Engineering, SungKyunKwan University, 300 Cheoncheon-dong, Suwon 440-746, KOREA

autor

Choi G. W.

• School of Mechanical Engineering, SungKyunKwan University, 300 Cheoncheon-dong, Suwon 440-746, KOREA

autor

Walicka A.

• University of Zielona Góra, Department of Mechanics ul. Szafrana 2. P.O. Box 47, 65-016 Zielona Góra, POLAND

autor

Walicki E.

• University of Zielona Góra, Department of Mechanics ul. Szafrana 2. P.O. Box 47, 65-016 Zielona Góra, POLAND

Bibliografia

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• [3] Eringen A.C. (1966): Theory of micropolar fluids. - J. Math. Mech., vol.16, No.l, pp.1-18.
• [4] Nigam K.M., Manohar K. and Jaggi J. (1982): Micropolar fluid film lubrication between two parallel plates with reference to human joints. - Int. J. Mech. Sci., vol.24, No.l 1, pp.661-671.
• [5] Papautsky I., Brazzle J., Ameel T. and Frazier A.B. (1999): Laminar fluid behavior in microchannels using micropolar fluid theory. - Sensors and Actuators, vol.A73, pp.101-108.
• [6] Rees D.A.S. and Bassom A.P. (1996): The Blasius boundary-layer flow of micropolar fluid. - Int. J, Engng. Sci., vol.34, No.l, pp.113-124.
• [7] Walicka A. (1994): Micropolar Flow in a Slot Between Rotating Surfaces of Revolution. - Zielona Góra: TU Press.
• [8] Walicka A. (2000): Pressurized flows of a micropolar fluid between surfaces of revolution', the fixed one and the rotating one. - Chemical and Processing Eng., vol.21, No.l, pp.57-74.