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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v7.i5.30
pages 327-331

Heat Transfer Enhancement and Pressure Drop in the Flow Boiling Field with the Bubble Movement Restricted by a Screen Sheet

Katsushiko Kadoguchi
National Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, 305-8569 Ibaraki, Japan
Morifumi Tashiro
National Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, 305-8569 Ibaraki, Japan

ABSTRAKT

A unique method, which was previously proposed by the authors in the pool boiling case, was experimentally investigated under flow boiling conditions. A screen sheet was used in this method. It was set parallel to the horizontal heated wall with a very small separation. When nucleate boiling occurred on the wall, the vapor bubbles generated were trapped by the screen and became flat. Then they moved downstream along the heated surface in the gap between the screen and the wall. This movement caused the heat transfer augmentation. Although the pressure drop was increased considerably, the results showed that the heat transfer enhancement seen in pool boiling also occurred under the flow boiling situation within the present experimental range.


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