Incipience of Boiling at an Enhanced Heat Sink with a Microchannel Structure

Autor:	Tadakatsu Nakajima, Heikichi Kuwahara, Shigeo Ohashi
Rok vydání:	1996
Předmět:	Superheating Cross section (physics) Hysteresis Microchannel Materials science Mechanical Engineering Boiling Thermodynamics Mechanics Heat sink Condensed Matter Physics Porosity Nucleate boiling
Zdroj:	TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B. 62:3406-3412
ISSN:	1884-8346 0387-5016
Popis:	The device considered in this paper is a porous stud having microchannels running in three orthogonal directions, and was designed to enhance boiling heat transfer for liquid-cooled electronic components. The characteristics of boiling incipience at the microstructures on the porous stud were investigated. Experiments were performed to determine the temperature hysteresis during stepwise input of heater power Q to a simplified two-dimensional structure composed of parallel microchannels (cross section=0.3mm×0.5mm or 0.3mm×1.5mm). It was shown that wall superheating at incipience of boiling is almost independent of Q and channel cross section, remaining at a level of 10∼14K. Therefore, with increasing Q, temperature overshoot decreases. We also gave an analytical explanation, based on a transient heat conduction equation, for the mechanism of the incipience of boiling in the microchannels. Finally, using these results, the boiling incipience at the porous stud was explained.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cb6fba012b16a700578d03dc6dfff849 https://doi.org/10.1299/kikaib.62.3406 Zobrazit plný text záznamu