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：在两个相环形流动条件的一范围内测量水平90度弯曲的质量传递系数的分布。在高施密量（SC = 1280）处的溶解墙技术用于测量。在弯曲外壁的中心线上发生在弯曲外壁的中心线上，在所有测试条件下的弯曲入口的角度大约50度。发现最大传质面积在圆周方向上横跨大约30度。在一些情况下，在弯曲的后部发生弯曲部分的后部发生了第二个引起的质量传递区域。改变空气和水位表速度（J_V = 20至30 m / s，J_L = 0.17至0.41 m / s）表明，空气速度对大规模转移的效果大于水速度;然而，水速度对传质转移的影响并不微不足道。
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