PRESSURE DROP IN R-245FA CONDENSATION IN TUBES FITTED WITH COILED-WIRE INSERTS

被引：1

作者：

Khatua, Ajit Kumar ^{[1
]}

Kumar, Parmanand ^{[1
]}

Singh, Hari Narayan ^{[1
]}

机构：

[1] Natl Inst Technol, Dept Mech Engn, Jamshedpur, Bihar, India

来源：

JOURNAL OF ENHANCED HEAT TRANSFER | 2014年 / 21卷 / 06期

关键词：

rough surface; two-phase flow; structured roughness and condensation enhancement hydrodynamics; HEAT-TRANSFER; PREDICTION;

D O I：

10.1615/JEnhHeatTransf.2015012442

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This study examines pressure drop during condensation of R-245fa pure vapor inside two separate horizontal coaxial double-pipe test sections with coiled-wire inserts assembled in series. For each inserted tube and the plain tube, data were collected for mass fluxes in the range of 100 to 250 kg/m(2)s in increments of 50 kg/m(2)s for vapor qualities ranging from 0.1 to 0.9. It was observed that the pressure drop inside a horizontal tube is a complex function of vapor quality, mass velocity, and coil pitch, and in a low vapor quality region. The highest pressure drop ratio was 13.33 for a coil pitch of 3.0 mm at a refrigerant mass flux of 150 kg/m(2)s.

引用

页码：425 / 438

页数：14

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