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Title：Non - isothermal separated gas-liquid flows in mini and micro channels: Theory and experiment
Speaker：Professor Oleg A. Kabov, Department of engineering thermal physics, Tomsk Institute of Technology
Host：Pro. WANG Wen
Time：13：30 PM, June 14th
Place：F201, School of Mechanical Engineering
 

Abstract:
Thin liquid films driven by a forced gas/vapor flow are a promising candidate for the thermal management of advanced semiconductor devices in earth and space applications. Two-sided three-dimensional non-stationary mathematical model was developed. Numerical code has been tested by comparison with exact solutions and experimental data. Systematic numerical investigations of temperature and concentration profiles evolution in gas and liquid phases as well as evolution of free interface deformations have been performed. The effects of temperature dependence of liquid viscosity and gravity have been studied on intensity of evaporation and gas-liquid interface flow structure. Schlieren technique, high-speed visualization and infrared thermography have been used in experimental investigations. Experiments with water and FC-72 in flat channels (height 0.6 - 2 mm) have been conducted. Pure nitrogen has been used as a gas phase. Maps of flow subregimes for shear-driven film were plotted. Stratified flow exists and stable in minichannels with width of 40 mm. Thermocapillary effect can be considered as one of the most important reason for the film rupture. The effect of a contact angle on the critical heat flux has been studied for water. The longitudinal micro-fins with the height of 0.3 and 0.5 mm may increase CHF by a factor 3.
 

Biography:
Oleg A. Kabov graduated from the Tomsk Polytechnic State University, Russia, in 1978 and received the Ph.D. degree from the Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences (IT) in 1987. In 1999 he received the degree of Doctor of Sciences in Physics and Mathematics (habilitation) from the same institute. In 2007 he has been granted the diploma of Professor on thermal physics and thermal fluids science of Russian Academy of Sciences. Since 1987, he has been the Head of Laboratory of Enhancement of Heat Transfer in IT (Novosibirsk). His current research interests include: shear-driven and falling liquid films and rivulets, two-phase flows in microgravity and hypergravity, drop spreading and drop evaporation, condensation, evaporative and thermocapillary convection. He has authored and coauthored 271 papers in referred journals and conference proceedings, 7 patents, has delivered 59 keynotes, plenary, and invited lectures at technical conferences and institutions. Since 2009 he is a member of the Editorial Board of the Journal of Microgravity Science and Technology. In 2006 Professors Kabov and Legros initiated the permanent yearly Workshop on Two-Phase Systems for Ground and Space Applications. Since 2013 he is serving as Editor-in-Chief of the Journal “Interfacial Phenomena and Heat Transfer” published by Begell House.