Hydraulic losses in cryogenic pipelines

Abstract

Pressure losses in cryogenic pipelines for cases of monophasity of the flow are defined by known formulas of hydraulics for ordinary viscous liquids. The movement of the two-phase flow is much complicated by the hydraulic calculation of the cryogenic pipeline. There are basically three types of cryogenic flow movement in the pipelines. The first type is characterized by a sufficiently uniform distribution of the gas phase over the entire volume of the flow (homogeneous gas-liquid mixture). The second type is characterized by sections of gas and liquid (projectile structure). The third type is characterized by the movement of liquid along the annular section at the walls of the pipe and gas with a higher speed in its central part. In the absence of heat exchange with the environment, when pressure losses are associated with gravity and friction, the calculation formulas are offered in the paper for hydraulic calculation of multiphase cryogenic pipelines.