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dc.contributor.authorYan, YYen_US
dc.contributor.authorLin, TFen_US
dc.date.accessioned2014-12-08T15:47:15Z-
dc.date.available2014-12-08T15:47:15Z-
dc.date.issued1998-12-01en_US
dc.identifier.issn0017-9310en_US
dc.identifier.urihttp://dx.doi.org/10.1016/S0017-9310(98)00127-6en_US
dc.identifier.urihttp://hdl.handle.net/11536/31710-
dc.description.abstractAn experiment was carried out to investigate the characteristics of the evaporation heat transfer and pressure drop for refrigerant R-134a flowing in a horizontal small circular pipe having an inside diameter of 2.0 mm. The data are useful in designing more compact and effective evaporators for various refrigeration and air conditioning systems. The effects of the imposed wall heat flux, mass flux, vapor quality and saturation temperature of R-134a on the measured evaporation heat transfer and pressure drop were examined in detail. When compared with the data for larger pipes (D-i greater than or equal to 8.0 mm) reported in the literature, the evaporation heat transfer coefficient for the small pipe considered here is about 30-80% higher for most situations. Moreover, we noted that in the small pipe the evaporation heat transfer coefficient is higher at a higher imposed wall heat flux except in the-high vapor quality region, at a higher saturation temperature, and at a higher mass flux when the imposed heat flux is low. In addition, the measured pressure drop is higher for increases in the mass flux and imposed wall heat flux. Based on the present data, empirical correlations were proposed for the evaporation heat transfer coefficients and friction factors. (C) 1998 Elsevier Science Ltd. All rights reserved.en_US
dc.language.isoen_USen_US
dc.titleEvaporation heat transfer and pressure drop of refrigerant R-134a in a small pipeen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/S0017-9310(98)00127-6en_US
dc.identifier.journalINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFERen_US
dc.citation.volume41en_US
dc.citation.issue24en_US
dc.citation.spage4183en_US
dc.citation.epage4194en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
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