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Cavitation induced by water hammer in liquid hydrogen pipelines threatens operational safety. A cavitation flow model incorporating unsteady friction was established and validated via experimental data. Compared with traditional cavitation model, average prediction errors are reduced by 7.24 and 6.95 percentage points for the water hammer without cavitation and water hammer with cavitation by the proposed model. The effects of valve closure time, flow velocity, and supercooling temperature on water hammer conditions were investigated. The results show that more severe cavitation is caused by shorter valve closing time and higher flow velocity, while reducing water hammer wave speed and prolonging wave transmission cycle. At a valve closing time of 0.1 s, the second pressure wave peak exceeds the first by 14.04 %. Water hammer pressure is increased by 31.78 kPa on average per 0.5 m/s velocity increase. Cavitation resistance is significantly increased by lower supercooling temperatures despite minor effects on peak pressure. • Modeling cavitating flow in liquid hydrogen pipelines. •Unsteady friction effects are non-negligible. •Investigate effects of valve closing time, flow velocity, and subcooling temperature. •Cavitation intensifies under shorter valve closure and higher flow velocity. •Lowering subcooling temperature mitigates cavitation. The information of the ORCID is informed as follows:
Qiu et al. (Wed,) studied this question.