| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
Experiments were performed on two-phase flow pattern and boiling heat transfer of refrigerants R410A and R32 flowing in horizontal rectangular and triangular mini-channels with hydraulic diameter of about 1 mm, and their characteristics were clarified, compared with results for circular mini-channels, to examine the effect of flow channel geometry. In noncircular mini-channels, enhancement of heat transfer was successfully accomplished mainly with liquid film conduction evaporation at low mass flux, low quality and low heat flux in slug flow, in which thickness of liquid film around vapor plug was very thin especially on the sides of channel cross-section perimeter. Prediction of heat transfer in noncircular mini-channels was proposed considering liquid film conduction evaporation contribution in addition to nucleate boiling and forced convection evaporation heat transfers resulting even in conventional diameter channels.
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