Abstract
Measurement of pressure drop was conducted on water-air foam flowing through a vertical rectangular pipe. The foam flow was modeled by a plug flow lubricated by a thin layer (slip layer) of a Newtonian liquid on a pipe wall. Direct measurement of the thickness of the slip layer was also conducted in this study. Video images of the slip layer indicated that the thickness of the layer is in the order of tenth of micron meters and increases as increasing the velocity of the foam flow. Image processing of the video images showed that the increase in the slip layer thickness is due to deformation of nearest bubbles at the pipe wall which subject to shear force from the liquid slip layer.
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