Cryogenic Liquid Hydrogen Suction Dip and Slosh Wave Excitation during Draining in Microgravity
The dynamical behavior of vapor ingestion, liquid residual at the incipience of suction dip, the critical liquid residual at the initiation of the liquid-vapor interface dip formed, and slosh wave excitation under normal and various reduced gravity environments and different flow rates of liquid have been investigated during the courses of liquid hydrogen draining. It shows that the liquid residual at the incipience of suction dip, and the critical liquid residual at the initiation of the liquid-vapor interface dip formed increases as the values of gravity environment decreases from normal gravity to lower reduced gravity, and also that the liquid residual increases as the flow rates of liquid increase during the courses of liquid hydrogen draining. In the slosh wave excitation, it shows that slosh waves are unable to excite for flow fields with a lower ratio of Bond number to Weber number. Results indicate that flow fields with lower flow rates of liquid draining and higher restoring force fields of gravity are responsible for the excitation of lower frequencies (higher wave periods) and higher wave amplitude slosh waves.
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