

EXPERIMENTAL INVESTIGATION THE FORMATION OF GASLIQUID FLOW AND ITS STRUCTURE IN RECTANGULAR MICROCHANNEL WITH TSHAPED ENTRANCE
Kozulin I.A.^{1,2}, Kuznetsov V.V.^{1,2}
^{1} Institute of Thermophysics SB RAS, Novosibirsk, Russia ^{2} Novosibirsk State University, Novosibirsk, Russia
Citation:
Kozulin, I.A. and Kuznetsov, V.V., (2012) Experimental investigation the formation of gasliquid flow and its structure in rectangular microchannel with Tshaped entrance, Modern Science: Researches, Ideas, Results, Technologies, Iss. #2(10), PP. 123  127.

Keywords: regimes of gasliquid flow; microchannel systems; microchannel; Tshaped entrance; statistical characteristics 
Abstracts:
Microchannel systems are actively used to cool the processor supercomputers, avionics systems, chemical and medical technologies. It is associated with a significant increase in heat and mass transfer on surfaces, and with the possibility of new regimes of flow. The aim of this work is study of twophase gasliquid flow in rectangular microchannel with dimension 370x217 um; we investigated the effect of the Tshaped entrance on the organization of the flow, including the distribution of gas and liquid lengths. Research methods based on the twobeam laser scanning and video, capable of measuring the velocity of slugs in the twophase flow; determine the statistical characteristics of the twophase flow. 
References:
Coleman J.W., Garimella S. Characterization of twophase flow patterns in small diameter round and rectangular tubes // Int.J. of Heat and Mass Transfer.  1999.  Vol. 42.  N 15.  P. 28692881.
Qu W., and Mudawar I. Thermal design and methodology for highheatflux single phase and twophase microchannel heat sinks // Proceedings of the Intersocietal Conference on Thermal Phenomena in Electronics Systems.  2002.  P. 347359.
Choi C.W. Yu D.I., Kim M.H. Adiabatic twophase flow in rectangular microchannels with different aspect ratios: part 1  flow pattern, pressure drop and void fraction //Int.J. of Heat and Mass Trans. 2011.  Vol. 54.  P. 616624.
Chung P.M.Y., Kawaji M. The effect of channel diameter on adiabatic twophase flow characteristics in microchannels // Int.J. Multiphase Flow.  2004.  Vol.30.  N 78.  P.735761.
Chung P.M.Y., Kawaji M., Kawahara A., and Shibata Y. Twophase flow through square and circular microchannels  effects of channel geometry // J. Fluid. Eng.  2004.  Vol. 126.  N 4.  P.546552.
Mishima K. and Ishii M. Flow regime transition criteria for upward twophase flow in vertical tubes // Int.J. Heat Mass Trans.  1984.  Vol. 27.  N 5.  P.723737.
Dukler A.E., Wicks M., and Cleveland R.G. Frictional pressure drop in twophase flow // AIChE J.  1964.  Vol.10.  N 1.  P.3851.
Kreutzer M.T., Kapteijn F., Moulijn J.A., Kleijn C.R., Heiszwolf J.J. Inertial and interfacial effects on pressure drop of Taylor flow in capillaries // AIChE J.  2005.  Vol. 51.  N 9.  P. 24282440.


