抄録
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.
