Air-Water Two-phase Flow Patterns and Frictional Pressure Drop in 90 Degree Bend With Defferent Curvature Radius And Flow

• Main Authors: An-Kai Chang, 張安凱
• Other Authors: LIOU, SHIU GUANG
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/56530281963310952755

碩士 === 國立雲林科技大學 === 機械工程系 === 104 === This study is to conduct experimental investigations of two-phase flow air-water mixture flowing different angle in 90°bends. A total of two 90°bends has been tested for the present study. The test tubes are made of glass tube having inner diameters (D) 6.5 mm with dimensionless tube curvature ratio (2R/D) of 4.6、7.07、11.4 .The range of mass flux for two-phase mixture is between 100 ~ 300 kg/m2s. For vertical upward flow, elbow friction pressure drop is greater than horizontal flow, because the vertical upward flow generated reverse flow、rotation motion at the elbow，for vertical downflow , because there is no reverse flow、rotation motion at the elbow so elbow friction pressure drop less than horizontal flow. However, with the increased quality reverse flow、rotation motion is not obvious, vertical upward flow、horizontal flow、vertical downflow, elbow frictional pressure drop will be relatively small differences, with the increased mass flux, elbow frictional pressure drop will be small, with the increased curvature radius, elbow frictional pressure drop will be great Keywords: Two-phase flow, 90 degree bend, frictional pressure drop, flow pattern , Curvature Radius