Library Subscription: Guest
Home Archives Officers Future meetings American Society of Thermal and Fluids Engineering
Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

STABLE, CALM, AND HIGH-HEAT-FLUX HEAT REMOVAL USING A POROUS-MICRO-CHANNEL

Tomio Okawa
The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi, Tokyo 182-8585, Japan

Junki Ohashi
The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi, Tokyo 182-8585, Japan

Ryo Hirata
The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi, Tokyo 182-8585, Japan

Koji Enoki
The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi, Tokyo 182-8585, Japan

Abstract

To achieve high-heat-flux heat removal, a coolant flow channel of thin rectangular cross-section was filled with a porous metal plate of high porosity (greater than 0.9). This flow channel was referred to as a porous-microchannel (PMC) in this work. The heated surface was circular in shape and 9 mm in diameter; filtrated and deionized tap water was used as the coolant. Parametrically changing the coolant flow rate and subcooling, boiling curve under each condition was experimentally determined. It was shown that the CHF and the boiling heat transfer coefficient are generally higher in PMC than in the normal channel containing no porous plate. In addition, violent pressure loss fluctuation was induced in the normal channel at high heat fluxes, but such fluctuation was thoroughly stabilized in PMC. It was considered that enhanced heat transfer can be attributed to the mixing enhancement due to complicated flow field produced in the porous material. Another interesting observation in this work was the peculiar boiling curve that was obtained under the conditions of high subcooling and high mass flow rate. In this case, higher heat flux was achieved after normal nucleate boiling was completed. In the normal channel, this observation is known as the microbubble emission boiling (MEB). Although the boiling curve in PMC was similar to that in the normal channel, significant noise generation usually encountered during MEB in the normal channel could be avoided in PMC. Thus, the present work experimentally demonstrated that PMC enables stable, calm, and high-heat-flux heat removal.

Purchase $20.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page