MOTION OF LONG BUBBLES DUE TO A PRESSURE-DROP IN A HYDROPHILIC CAPILLARY

Experimental results concerning the motion of a gas bubble (column) in a glass capillary filled with an aqueous solution of KCl and sodium d odecylsulfate (a surfactant) are given; these include measurements of the bubble velocity (u(c)) and the thickness of the solution film betw een the column surface and the interior surface of the capillary (r(f) ) as functions of the pressure drop (head) that causes the motion and the geometrical parameters of the system. The results of experiments s howed that the systems in question are essentially labile. The resulta nt data were compared with two theoretical dependences. The model base d on the concept of total film flow was shown to display significantly better agreement with the experimental data.