TED-AJ03-339 EXPERIMENTAL STUDY ON POOL BOILING OF FC-72 IN GRAPHITE FOAMS

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概要

• 論文の詳細を見る

• Experiments were performed to study pool boiling heat transfer from a natural graphite foam surface in saturated FC-72. Three 10 x 10 x 3mm graphite samples were tested in the study. One sample was left in its natural form and the other two underwent surface enhancements. One of the enhanced samples was drilled with three horizontal holes, each with a diameter of 0.4mm. The other was drilled with nine vertical holes with the same diameter. All three samples were mounted separately on the surface of a copper block with a heat transfer area of 1cm x 1cm. Two high-density heaters (2 x 150W) were inserted into the bottom of the copper block and the sample was supposed to dissipate the built up heat from the heater through the graphite foam into FC-72. Testing was performed in a specially designed test chamber, where the same conditions are maintained for all the tests with a saturation temperature of 40℃ and a saturation pressure of 0.54 atm In addition, the effect of electric field on pool boiling in the graphite foam was investigated. A mesh electrode was placed 8mm above the foam surface and set on several DC electric fields. 5,10,and 20KV, respectively. Experimental results show that incipient boiling commences at a slightly higher superheat in graphite foams than that on the flat plate. In the presence of graphite foam, the nucleate boiling is downgraded. However, the graphite foam with holes can improve the nucleate boiling performance in comparison with the foam without holes. The foam with vertical holes showed better performance than that with horizontal holes. In the presence of electric fields, the incipient boiling occurred at a lower superheat in graphite foams. The electric field proved to facilitate boiling incipience and make more nucleation sites active. Moreover, the use of an electric field was observed to stabilize bulk convection pattern around the foam. In a lower superheat region, a high electric field improved boiling heat transfer. However, in a high superheat region, pool boiling heat transfer was deteriorated under a high electric field.

• 一般社団法人日本機械学会の論文

著者

• Kalo Radwan

  Department Of Mechanical Engineering University Of Maryland

• Qi Jianwei

  Department of Mechanical Engineering University of Maryland

• Ohadi M.

  Department of Mechanical Engineering University of Maryland

関連論文

• TED-AJ03-339 EXPERIMENTAL STUDY ON POOL BOILING OF FC-72 IN GRAPHITE FOAMS
• TED-AJ03-131 A SOURCE-INTEGRATED MICRO COOLING DEVICE

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