The distributions of the mass transfer coefficient in horizontal 90 degree bends were measured under a range of two phase annular flow conditions. A dissolving wall technique at a high Schmidt number (Sc=1280) is used for the measurements. The maximum mass transfer occurred on the centerline of the bend outer wall at an angle of approximately 50 degrees from the bend inlet under all tested conditions. The area of maximum mass transfer was found to span approximately 30 degrees in the circumferential direction. A second region of enhanced mass transfer occurred on the latter part of the bend with a local maximum occurring slightly off the bend centerline in some cases. Changing the air and water superficial velocities (J_v=20 to 30 m/s,J_L=0.17 to 0.41 m/s) showed that the air velocity had a larger effect on the mass transfer than the water velocity; however the effect of the water velocity on the mass transfer was not insignificant.
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机译：在两相环形流动条件下，测量了水平90度弯曲中传质系数的分布。使用高施密特数（Sc = 1280）的溶解壁技术进行测量。在所有测试条件下，最大质量转移发生在弯曲外壁的中心线上，与弯曲入口的夹角约为50度。发现最大传质区域在圆周方向上跨越约30度。传质增强的第二个区域出现在弯头的后半部分，在某些情况下，局部最大值略微偏离弯头中心线。改变空气和水的表面速度（J_v = 20至30 m / s，J_L = 0.17至0.41 m / s）表明，空气速度对传质的影响大于水速度。然而，水速对传质的影响并不显着。
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