✦ LIBER ✦

Behaviors of micro-layer in micro-channel boiling system applying laser extinction method

✍ Scribed by Yoshio Utaka; Yutaka Tasaki; Shuhei Okuda

Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 819 KB
Volume: 35
Category: Article
ISSN: 1099-2871
DOI: 10.1002/htj.20096

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✦ Synopsis

To elucidate the mechanism and characteristics of boiling heat transfer in a micro-channel vaporizer, the experimental investigation of the micro-layer thickness that formed between the heating surface and vapor generated was important. The micro-layer thickness was measured applying the laser extinction method for channel gap sizes of 0.5, 0.3, and 0.15 mm. It was clarified that the gap size, the rate of bubble growth, and the distance from the incipient bubble site have an effect on the microlayer thickness in a micro-channel boiling system. The initial micro-layer thickness grew with an increase of the velocity of bubble forefront to moderate the value of the velocity. In the region of greater velocity, the thickness was constant for each gap. The distributions of the initial thickness of micro-layer on the heat transfer surface were shown.

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