EXPERIMENTAL STUDY ON HEAT TRANSFER OF NEW INNER FINNED TUBES HEAT EXCHANGER WITH PETAL-SHAPE FLAT CHANNELS
As an effective method for heat transfer enhancement, internally finned tubes have been often employed in compact heat exchangers, But neither experimental measurements nor numerical analysis have been performed for new internally finned tubes with petal-shaped flat channels, which are introduced in this paper. Though an experimental method studied was the heat convection and resistance characteristics of the new internally finned tubes with petal-shaped flat channels. The corresponding correlation formulas of heat convection and resistance for the new finned heat exchange tubes were obtained. Moreover, by employing the three criteria of equal mass flow rate, equal pump power and equal pressure drop compared was the heat transfer effectiveness of the new finned tubes and the ordinary bare tubes. The results show that the new inner finned tubes with petal-shaped flat channels have relatively high heat exchange effectiveness and configuration of the finned tubes has a relatively great influence on heat-exchange intensification effectiveness. The intensification effectiveness is especially conspicuous under the condition of a low Reynolds number.
internally finned heat exchange tubes experimental study heat transfer enhancement
Xiaoyan LI Haitao LI Zesheng Yan
School of Refrigeration Engineering, Harbin University of Commerce,Harbin,150028,China
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）