Characterizing the complex two-phase hydrodynamics in structured packed columns requires a power- ful modeling tool. The traditional two-dimensional model exhibits limitations when one attempts to model the de- tailed...Characterizing the complex two-phase hydrodynamics in structured packed columns requires a power- ful modeling tool. The traditional two-dimensional model exhibits limitations when one attempts to model the de- tailed two-phase flow inside the columns. The present paper presents a three-dimensional computational fluid dy- namics （CFD） model to simulate the two-phase flow in a representative unit of the column. The unit consists of an CFD calculations on column packed with Flexipak 1Y were implemented within the volume of fluid （VOF） mathe- matical framework. The CFD model was validated by comparing the calculated thickness of liquid film with the available experimental data. Special attention was given to quantitative analysis of the effects of gravity on the hy- drodynamics. Fluctuations in the liquid mass flow rate and the calculated pressure drop loss were found to be quali- tatively in agreement with the experimental observations.展开更多
Cavitation is one of the troublesome problems in rocket turbo pumps,and since most of high-efficiency rocket propellants are cryogenic fluids,so called 'thermodynamic effect' becomes more evident than in water...Cavitation is one of the troublesome problems in rocket turbo pumps,and since most of high-efficiency rocket propellants are cryogenic fluids,so called 'thermodynamic effect' becomes more evident than in water.In the present study.numerical and experimental study of liquid nitrogen cavitation in 2D Laval nozzle was carried out ,so that the influence of thermodynamic effect was examined.It was revealed that temperature and cavitation have strong inter-relationship with each other in thermo-sensitive cryogenic fluids.展开更多
基金Supported by the Major State Basic Research Development Program of China(2011CB706501)the National Natural Science Foundation of China(51276157)
文摘Characterizing the complex two-phase hydrodynamics in structured packed columns requires a power- ful modeling tool. The traditional two-dimensional model exhibits limitations when one attempts to model the de- tailed two-phase flow inside the columns. The present paper presents a three-dimensional computational fluid dy- namics （CFD） model to simulate the two-phase flow in a representative unit of the column. The unit consists of an CFD calculations on column packed with Flexipak 1Y were implemented within the volume of fluid （VOF） mathe- matical framework. The CFD model was validated by comparing the calculated thickness of liquid film with the available experimental data. Special attention was given to quantitative analysis of the effects of gravity on the hy- drodynamics. Fluctuations in the liquid mass flow rate and the calculated pressure drop loss were found to be quali- tatively in agreement with the experimental observations.
文摘Cavitation is one of the troublesome problems in rocket turbo pumps,and since most of high-efficiency rocket propellants are cryogenic fluids,so called 'thermodynamic effect' becomes more evident than in water.In the present study.numerical and experimental study of liquid nitrogen cavitation in 2D Laval nozzle was carried out ,so that the influence of thermodynamic effect was examined.It was revealed that temperature and cavitation have strong inter-relationship with each other in thermo-sensitive cryogenic fluids.
