混相流研究の進展
Online ISSN : 1881-6088
Print ISSN : 1881-5804
ISSN-L : 1881-5804
論文
給液方法の改善による狭あい流路内強制流動沸騰における高効率冷却
三浦 進一稲田 幸博原 健太新本 康久大田 治彦
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2009 年 4 巻 p. 53-60

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For the high-performance, large-capacity and downsizing of electronic equipments, the thermal management becomes more important by the increasing heat generation density from semiconductors densely integrated. Flow boiling heat transfer is one of effective methods because of its high heat removal ability. Experiments on the increase of CHF for flow boiling in narrow channels by improved liquid supply were conducted for the development of high-performance cold plates for space applications. A large surface of 150mm in heated length and 30mm in width with fine grooves was employed. A structure of narrow heated channel between parallel plates with an auxiliary unheated channel was devised and tested by using water as a test fluid for different combinations of gap sizes and volumetric flow rates, where five different liquid supply modes were compared. Values of CHF larger than 2×106W/m2 were obtained only for a gap size of 2mm, indicating that higher vapor velocity in the main heated channel was more important than the enlargement of gap size to increase CHF in the experimental range. Under several conditions for gap size of 2mm, the extensions of dry-patches are observed at the upstream location of the main heated channel resulting burnout not at the downstream but at the upstream. It was clarified that there is an optimum flow rate distribution for both channels to obtain the highest values of CHF. For a gap size of 2mm, high heat transfer coefficient as much as 7.4×104W/m2K are obtained at heat flux 1.5×106W/m2 under the mass velocity 720kg/m2s based on the total volumetric flow rate and on the cross section area of the main heated channel. It is a useful method to supply the cooling liquid from the auxiliary unheated channel in the transverse direction perpendicular to the flow in the main heated channel in order to also obtain high heat transfer coefficient.

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© 2009 日本混相流学会
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