An experimental investigation was conducted concerning the circumferential variations of the characteristics of a liquid film formed on the inner surface of a round tube. Attention was paid to the characteristics of the disturbance wave which plays important roles in the maintenance a liquid film near the top of the tube and the transportation of liquid. The circumferential variations of film thickness parameters and the effect of pipe inclination on those parameters were examined. The main results are summarized as follows:(1) Wave height of the base film,
hB, is approximately equal to the mean base film thickness,
tBm, and the effect of pipe inclination and flow rates of both air and water on
hB is qualitatively the same as that on
tBm, (2) Disturbance wave height is five to twenty times of
tBm, and it depends strongly on superficial water velocity,
j1, while
tBm has a weak dependence on
j1.(3) The generation of a disturbance wave is mainly controlled by the flow condition of the base film at the bottom.(4) The flow mechanism of the base film changes at the liquid flow rate of
j1=0.04m/s.
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