Frictional pressure drops of two-phase R-134A flow in horizontal and vertical U-type wavy and straight tubes

Ing Youn Chen*, Yu Shi Wu, Yu Juei Chang, Chi-Chuan Wang

*Corresponding author for this work

研究成果: Conference contribution同行評審

摘要

This study presents the measurements of R-134a two-phase frictional pressure gradient subject to vertical and horizontal arrangements of a U-type wavy tube with inner diameter of 5.07 mm and a curvature ratio of 5. The ratio between two-phase pressure gradients of U-bend and straight tube is about 2.5 - 3.5. For the straight tube, the frictional two-phase pressure gradient ratio between the vertical and horizontal arrangements is marginally higher (1.0 - 1.2) for annular flow pattern at x > 0.5, and is 1.0 - 1.4 for the U-bend in the wavy tube. The higher resistance in the vertical arrangement is due to the buoyancy force against the flow inertia. However, for x < 0.5, this ratio is gradually increased due to the difference of flow pattern. The ratio is increased to 1.8 in the straight tube. For the U-bend, the ratio is 2.1 for flow entering the upper tube and is 1.5 for flow entering the lower tube at x = 0.1 and G = 200 kg/m2.s. For the vertical wavy tube, additional effects like the flow pattern transition, liquid flow reversal, and freezing slug may cause additional pressure drops.

原文English
主出版物標題Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Fluids Engineering Division
發行者American Society of Mechanical Engineers (ASME)
ISBN(列印)0791837904, 9780791837900
DOIs
出版狀態Published - 1 一月 2006
事件2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Chicago, IL, United States
持續時間: 5 十一月 200610 十一月 2006

出版系列

名字American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
ISSN(列印)0888-8116

Conference

Conference2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
國家United States
城市Chicago, IL
期間5/11/0610/11/06

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