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首页> 外文期刊>Journal of enhanced heat transfer >NUCLEATE POOL BOILING OF R-134A ON ENHANCED HORIZONTAL SURFACES HAVING PORES ON SUB-TUNNELS
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NUCLEATE POOL BOILING OF R-134A ON ENHANCED HORIZONTAL SURFACES HAVING PORES ON SUB-TUNNELS

机译：R-134a的核池沸腾在增强的水平表面上，在子隧道上具有毛孔

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Enhanced surfaces having circular pores and rectangular sub-tunnels were made and nucleate boiling tests were conducted using R-134a under horizontal positions. Nine samples had pore diameters from 0.1 mm to 0.3 mm and pore pitches from 0.75 mm to 3.0 mm. The heat transfer coefficient increased as the pore size increased, at least for the investigated test range. The reason was attributed to the increased bubble departure diameter with the pore diameter. The heat transfer coefficient also increased as the pore pitch decreased, while the number of pores increased approximately in proportion to the square of pitch ratio. Increased nucleate site density at smaller pore pitch appears responsible for the high heat transfer coefficient. Existing theoretical models did not adequately predict the present data. A new model was proposed, which predicted 70% of the present data within +/- 50%.
机译：制备具有圆形孔和矩形子隧道的增强表面，在水平位置下使用R-134a进行核心沸腾试验。九个样品的孔径为0.1mm至0.3mm，孔隙距0.75mm至3.0mm。随着孔径的增加，传热系数增加，至少用于研究的测试范围。原因归因于孔径增加的泡沫偏离直径。随着孔隙间距降低，传热系数也增加，而孔的数量大致成比例地增加到间距比的平方。较小的孔隙间距增加核心位点密度出现在高传热系数的原因中。现有的理论模型没有充分预测当前数据。提出了一个新模式，预测到+/- 50％内的70％的目前数据。

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