E201 HEAT TRANSFER AND PRESSURE DROP IN A BOILING TWO-PHASE FLOW WITH A RESTRICTED BUBBLE BEHAVIOR UNDER A SCREEN SHEET(Boiling two-phase flow)

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概要

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• A unique method previously proposed by the authors was applied to the heat transfer augmentation in the flow boiling field. In this method a screen sheet was put on the horizontal heated surface where bubble nucleation occurred. Generated vapor bubbles were trapped between the screen and the wall, became flat and moved along the surface. This restricted bubble behavior caused the heat transfer enhancement. Three types of the screen were tested in the present experiment and the effect of the screen was investigated on the heat transfer and two-phase flow characteristics. In two cases of them, the screen was displaced upward by the bubble nucleation. Compared with the ordinary flow boiling case, heat transfer was enhanced by a factor of 1.2 to 6 within the present experimental range. By using a simple flow model, it was made clear that the effect of the height of the displaced screen was important to evaluate the increase in pressure drop.

• 一般社団法人日本機械学会の論文
• 2000-10-01

著者

• Kadoguchi Katsuhiko

  National Institute For Resources And Environment

• Tashiro Morifumi

  National Institute for Resources and Environment

関連論文

• E106 MICRO GAS TURBINE CO-GENERATION SYSTEM AT SAPPORO CITY UNIVERSITY UNDER SERVICE CONDITIONS(Distributed Energy System-1)
• E201 HEAT TRANSFER AND PRESSURE DROP IN A BOILING TWO-PHASE FLOW WITH A RESTRICTED BUBBLE BEHAVIOR UNDER A SCREEN SHEET(Boiling two-phase flow)
• Thermal Conductivity of Water and Steam at High Temperatures and Pressures : 1st Report, Experimental Apparatus and Results with Water up to 200℃

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