Behavior of a Water Drop on a Horizontal Unwet Tube

Abstract

It is well known that the behavior of condensate drops have important significance in the heat transfer of dropwise condensation. However, it is difficult to clarify the behavior of the condensing drops on the condensing surface, because of their constantly changing weight and shape. Therefore, in the air, the behavior of a water drop with a constant weight on an unwet tube was investigated using a video-tape-recorder. The critical still mass, the falling velocity of a water drop and the condition in dropping from the tube, for some tube diameters, were clarified.