Numerical Simulation on Two-Phase Ejector with Non-Condensable Gas

Yinghua Chai, Yuansheng Lin (), Qi Xiao, Chonghai Huang, Hanbing Ke and Bangming Li
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Yinghua Chai: Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
Yuansheng Lin: Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
Qi Xiao: Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
Chonghai Huang: Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
Hanbing Ke: Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China
Bangming Li: Science and Technology on Thermal Energy and Power Laboratory, Wuhan 430205, China

Energies, 2024, vol. 17, issue 6, 1-19

Abstract: The two-phase ejector is a simple and compact pressure boosting device and widely used in ejector steam-generator water feeding systems and core emergency cooling systems. The direct contact condensation of water and steam is the key process of a two-phase ejector. Usually, the high-temperature and high-pressure steam will inevitably induce non-condensable gases. The existence of non-condensable gases will reduce the condensation heat transfer rate between steam and water, and harm the equipment. This study carried out 3D numerical simulations of a two-phase ejector based on an inhomogeneous multiphase model. The steam inlet pressure and the non-condensable gas mass fraction rang in 0.6–2.9 MPa and 1–10%, respectively. The heat and mass transfer characteristics were analyzed under different conditions. The results show that the heat transfer coefficient and plume penetration length increased with the steam inlet pressure. Non-condensable gas prevents direct contact condensation between the steam and water. The non-condensable gas mass fraction rises from 1% to 10%, the heat transfer between steam and water deteriorates, and leads to a lower heat transfer coefficient.

Keywords: non-condensable gas; two-phase ejector; direct contact condensation; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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