Evaporating Heat Transfer in Horizontal Internal Spiral-grooved Tubes in the Region of Low Flow Rates

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概要

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• This paper presents some experimental data about evaporating heat transfer in horizontal tubes about 4.75mm I.D. with small internal spiral grooves using R efrigerant R12. The groove inclinations of the tested internal spiral-grooved tubes are 4,7,15 and 30 degrees. It is found that a spiral-grooved tube can increase the evaporating heat transfer coefficient in tubes from one and a half times to twice as much as that of a smooth tube for annular flow region, and about ten times due to capillary phenomenon in grooves for stratified flow region.

• 一般社団法人日本機械学会の論文

著者

• Kimura Hideyuki

  Mechanical Engineering Research Laboratory Hitachi Ltd.

• Ito Masaaki

  Mechaical Engineering Research Laboratory Hitachi Ltd.

関連論文

• Boiling Heat Transfer and Pressure Drop in Internal Spiral-Grooved Tubes
• Evaporating Heat Transfer in Horizontal Internal Spiral-grooved Tubes in the Region of Low Flow Rates

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