Pressure drop in air/kerosene two-phase flow in horizontal pipe and control valve

摘要

Two-phase flow through a pneumatic control valve in series with a 23.5mm pipe has been studied for air and kerosene flow rates of 25 to 100 lph and 50 to 150 lph, respectively, with varying valve openings from 25 to 100 percent. The discharge rate versus pressure drop relationship is continuous in the case of single-phase flow and shows non-linearity with multiplicity in case of two-phase flow. The results are presented in the form of frictional pressure drop multipliers with Lockhart-Martinelli parameter. It has been found that pressure drop increases across the valve, as opening decreases, while for the pipe it increases with valve opening. The pressure drop data were fitted to flow rates by regression analysis with an error of less than one percent. The maximum pressure drop for valves is 27948 Pa while for the pipe section it is 1123 Pa for 25 percent valve opening. The minimum pressures drop of 249.9 Pa and 124.7 Pa for pipe and valve sections respectively when valve opening is 25percent.