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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 5

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

FLOW BOILING IN SUBCOOLED AND LOW QUALITY REGIONS − HEAT TRANSFER AND LOCAL VOID FRACTION

Kotohiko Sekoguchi
Kyushu University, Fukuoka, Japan

Kaneyasu Nishikawa
Kyushu Univ.; Fukuoka, Japan

Masao Nakasatomi
Kyushu Univ., Fukuoka, Japan

Noriaki Hirata
Kyushu Univ., Fukuoka, Japan

Hiroyuki Higuchi
Kyushu Univ., Fukuoka, Japan

DOI: 10.1615/IHTC5.440
pages 180-184

Resumo

Experimental results of the heat transfer and phase distribution in the flow boiling with inlet subcooling are reported. The phase distribution measurements were made on the spacial (i.e., radial and axial) distributions of void fraction and bubble frequency, which corresponds to the number of bubbles in contact with an electric probe tip per unit time. These phase profiles are compared with those of the flow boiling simulator using the air-water two-phase fluids, into which air is introduced through a porous tube wall. A bubble sublayer was found in the boiling experiments as well as had been recognized in the air-water flow boiling simulation results (l). Test data show that the void fraction of the bubble sublayer has a close relationship to heat transfer coefficient. An empirical correlation is also presented for the onset of bubble departure.

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