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Understanding the movement of drops and bubbles in microchannels is increasingly important in the design and operation of microfluidic devices that involve two-phase flows. Thus, Bretherton's analysis of the motion of long bubbles in tubes and the associated profile of the wetting film around it are relevant. In this work, steady motion of a long bubble through a cylindrical tube is revisited in the case where the wetting film between the bubble interface and the capillary wall is non-Newtoniandoi:10.1155/amrx/2006/36283 fatcat:4dwmibzybvdrfjhn2iqb546fti