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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

PRE-HEATING EFFECT ON THE EXPANSION OF A BOILING BUBBLE ON A SMALL FILM HEATER HIGH PULSE POWERED

DOI: 10.1615/IHTC13.p28.550
10 pages

Kunito Okuyama
Yokohama National Univ.

J. Nakamura
Yokohama National University, Yokohama, Japan

Shoji Mori
Yokohama National Univ., Tokiwadai 79-5, Hodogaya-ku, Yokohama 240-8501, Japan

Yoshihiro Iida
Department of Materials Science and Chemical Engineering Yokohama National University, Hodogaya, Yokohama, 240, Japan

Abstract

The pre-heating effect on the bubble expansion following spontaneous nucleation on a small film heater of high pulse power is investigated experimentally using ethyl alcohol as a test liquid. The pre-heating stage by a low-power pulse preceding the high-power pulse heating to cause spontaneous nucleation over the heater surface provides the significant storage of liquid superheat energy before boiling incipience. The growth configuration and the size of a single bubble formed by the coalescence of simultaneously nucleated bubbles are compared to the case without preheating. The bubble volume, which is estimated from top- and side-view photographs, increases significantly by the pre-heating and is well correlated with the liquid superheat energy at boiling incipience rather than the total pre-heating energy, regardless of the power or the period of the preheating. The bubble size (length, width and height) at maximum growth also correlated with the bubble volume, regardless of the pre-heating conditions.

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Measurement of fluid temperature with an arrangement of three thermocouples