A series of vortex tube nozzles were designed and fabricated,and the effect of various cross sections of nozzle and the number of the nozzle intakes on the energy separation performance of a vortex tube were investiga...A series of vortex tube nozzles were designed and fabricated,and the effect of various cross sections of nozzle and the number of the nozzle intakes on the energy separation performance of a vortex tube were investigated experimentally by using air as test fluid. The experimental results showed that the vortex tube with the nozzle cross section designed in this study was superior to that with the nozzles of normal rectangle cross section and that of Archimedes’ spiral type in terms of regeneration temperature performance under the condition of ambient temperature with inlet pressure of 0.4 MPa.The cooling performance of the vortex tube with four intakes nozzle was the best while that of the vortex tube with eight intakes nozzle was the worst under the same experimental condition.展开更多
Despite the simplicity of the vortex tube’s geometry,the fundamental mechanism underlying the energy separation effect is still elusive due in part to the complexity of flow behavior inside the tube.In order to inves...Despite the simplicity of the vortex tube’s geometry,the fundamental mechanism underlying the energy separation effect is still elusive due in part to the complexity of flow behavior inside the tube.In order to investigate its fundamental mechanism,a three-dimensional simulation was performed to predict the flow field and temperature distribution within a vortex tube.The results demonstrated that the large pressure gradient in the radial and axial directions was the main reason for the separation of hot and cool flow.Radial centrifugal force led to different static pressures at different positions along the axis.Inner flow experienced an adiabatic expansion process while peripheral flow experienced an adiabatic compression process.Due to gradient distribution of static temperature from axial center to periphery at different positions along the axis and re-circulating flow,heat trasfer and mass transfer occurred between inner and peripheral flow.Meanwhile,the numerical data and experimental results were compared and good agreement was obtained.展开更多
文摘A series of vortex tube nozzles were designed and fabricated,and the effect of various cross sections of nozzle and the number of the nozzle intakes on the energy separation performance of a vortex tube were investigated experimentally by using air as test fluid. The experimental results showed that the vortex tube with the nozzle cross section designed in this study was superior to that with the nozzles of normal rectangle cross section and that of Archimedes’ spiral type in terms of regeneration temperature performance under the condition of ambient temperature with inlet pressure of 0.4 MPa.The cooling performance of the vortex tube with four intakes nozzle was the best while that of the vortex tube with eight intakes nozzle was the worst under the same experimental condition.
文摘Despite the simplicity of the vortex tube’s geometry,the fundamental mechanism underlying the energy separation effect is still elusive due in part to the complexity of flow behavior inside the tube.In order to investigate its fundamental mechanism,a three-dimensional simulation was performed to predict the flow field and temperature distribution within a vortex tube.The results demonstrated that the large pressure gradient in the radial and axial directions was the main reason for the separation of hot and cool flow.Radial centrifugal force led to different static pressures at different positions along the axis.Inner flow experienced an adiabatic expansion process while peripheral flow experienced an adiabatic compression process.Due to gradient distribution of static temperature from axial center to periphery at different positions along the axis and re-circulating flow,heat trasfer and mass transfer occurred between inner and peripheral flow.Meanwhile,the numerical data and experimental results were compared and good agreement was obtained.
