Experimental and computational fluid dynamics was used in this study to predict the escape particles and evaluate the performance of PSC type cyclone tube with slotted vortex finder.The simulation results showed that ...Experimental and computational fluid dynamics was used in this study to predict the escape particles and evaluate the performance of PSC type cyclone tube with slotted vortex finder.The simulation results showed that the PSC type cyclone tube could remove the particles with a diameter greater than 5 μm.The PSC type cyclone tube increased the grade efficiency of particles with a diameter greater than 2 μm as compared with the Shell type cyclone tube.Short circuit flow occurred around the vortex finder slots and there was almost no short circuit flow under the vortex finder inlet.Most small particles escaped from vortex finder slots of the PSC type cyclone tube.The slotted vortex finder could develop "upwards flow" near the vortex finder inlet outside wall and control the escape particles under the vortex finder inlet.The force analysis of particles near the slotted vortex finder slots showed that gas flow carried the particles with a diameter smaller than 3 μm out the separator.展开更多
Heat transfer and fluid flow performance in internally finned tube with blocked core-tube was numerically investigated with the realizable k-ε turbulence model and wall function method.The working fluid was air.The n...Heat transfer and fluid flow performance in internally finned tube with blocked core-tube was numerically investigated with the realizable k-ε turbulence model and wall function method.The working fluid was air.The numerical method was validated by comparing the calculated results with available experimental data.It was found that there existed an optimal value for the ratio of core-tube outside diameter to outer-tube inside diameter, and this optimal value decreased with the increase of air flow rate.The optimal ratio was about 0.5—0.625 in the range of studied parameters.Meanwhile under the condition of identical pressure, the optimal ratio was also about 0.44—0.56.The conclusion is useful for the design of this kind of internally finned tubes.展开更多
文摘Experimental and computational fluid dynamics was used in this study to predict the escape particles and evaluate the performance of PSC type cyclone tube with slotted vortex finder.The simulation results showed that the PSC type cyclone tube could remove the particles with a diameter greater than 5 μm.The PSC type cyclone tube increased the grade efficiency of particles with a diameter greater than 2 μm as compared with the Shell type cyclone tube.Short circuit flow occurred around the vortex finder slots and there was almost no short circuit flow under the vortex finder inlet.Most small particles escaped from vortex finder slots of the PSC type cyclone tube.The slotted vortex finder could develop "upwards flow" near the vortex finder inlet outside wall and control the escape particles under the vortex finder inlet.The force analysis of particles near the slotted vortex finder slots showed that gas flow carried the particles with a diameter smaller than 3 μm out the separator.
文摘Heat transfer and fluid flow performance in internally finned tube with blocked core-tube was numerically investigated with the realizable k-ε turbulence model and wall function method.The working fluid was air.The numerical method was validated by comparing the calculated results with available experimental data.It was found that there existed an optimal value for the ratio of core-tube outside diameter to outer-tube inside diameter, and this optimal value decreased with the increase of air flow rate.The optimal ratio was about 0.5—0.625 in the range of studied parameters.Meanwhile under the condition of identical pressure, the optimal ratio was also about 0.44—0.56.The conclusion is useful for the design of this kind of internally finned tubes.
