Faculty of Engineering and Natural Sciences
ME 551 SEMINARS
Critical Heat Flux in Micro Domains
Heat dissipation from high power microelectronic devices is continuously rising due to their increasing functionality and demands. New cooling technologies are emergently sought to address to the requirement for effective heat dissipation capabilities, so that more compact and functional devices would be produced. Flow boiling is considered superior to single-phase flow since higher power densities can be achieved for a fixed mass velocity with a lower surface temperature rise. The most limiting factor in boiling flow systems is known as the critical heat flux (CHF) condition, which imposes an upper limit to the heat flux applied to microchannel surface. As a result, in recent studies, research has been directed to critical heat flux in minichannels and microchannels. The aim of the talk is to familiarize the audience with this subject and to discuss about recent advances and research efforts of the speaker in this subject. After a brief introduction in CHF, recent research activities in CHF in micro domains will be summarized. General trends in two different CHF mechanisms (DNB (Departure from Nucleate Boiling) and Dryout) will be discussed for both microscale and conventional scale and the differences will be revealed. In the second part of the talk, the speaker will include his experimental and analytical contributions to the subject and talk about his current and future research directions in this subject.
Ali Kosar received the B.S. degree in Mechanical Engineering from Boğaziçi University, Istanbul, in 2001. He pursued his graduate study in the Department of Mechanical Engineering at Rensselaer Polytechnic Institute between 2001 and 2006. He completed his M.S. and Ph.D. degrees in 2003 and 2006, respectively. He worked at Rensselaer Polytechnic Institute as a post doctorate research associate and adjunct faculty between 2006 and 2007. He joined the Mechatronics Engineering Program at Sabancı University in Fall 2007. His research interests lie in heat and fluid flow in micro domains, miniaturization of heat sinks, phase change phenomena in micro scale, microfluidics, and MEMS (Microelectromechanical Systems).
Wednesday, 15 October 2008, 13:40-14:30, FENS L065