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Condensate carryover phenomena in dehumidifying, finned-tube heat exchangers
Authors:Jingchun Min  Ralph L Webb  
Institution:

a Department of Thermal Engineering, The Tsinghua University, Beijing 100084, People's Republic of China

b Department of Mechanical and Nuclear Engineering, College of Engineering, The Pennsylvania State University, 137 Reber Building, University Park, PA 16802-1412, USA

Abstract:An experimental study has been conducted to investigate the condensate carryover phenomena in dehumidifying heat exchangers. Two wavy finned-tube coils were tested, for which the fin surfaces were treated to provide either low or high contact angles. The receding contact angle on the fins of the two coils were 70° and 10°, respectively. The distribution of condensate carryover was measured along the tunnel bottom downstream from the coil for different air frontal velocities. As the frontal velocity increases, the quantity of condensate carryover increases, and the condensate is blown further from the coil. The receding contact angle on the fin surface is a key factor controlling the condensate carryover characteristics. The coil having a 10° receding contact angle shows significantly less condensate carryover than the coil having a 70° receding contact angle. Numerous condensate droplets and bridges were observed on the fin surfaces of the 70° receding contact angle coil; however, few were seen for the 10° receding contact angle coil. The dominant carryover results from droplets formed from bridged condensate, and the diameter of the resulting droplets is approximately 3.0 mm.
Keywords:Heat exchanger  Finned-tube  Condensate carryover  Dynamic contact angle
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