Numerical Simulation Study Of Cold And Heat Energy Separation In Ranque-Hilsch Vortex Tube

The vortex tube has a simple structure and is easy to use.It can well separate the hot and cold gases entering its interior without any refrigerant to achieve the effect of cooling and heating.In addition to refrigeration and heating,vortex tubes also have important applications in many other projects because of their superior separation characteristics,but because of their complex internal fluid flow,no unified theoretical system has been formed so far,especially the study of micro-vortex tubes in the slip flow area has rarely been reported.In order to analyze the influence mechanism of size factor,boundary factor and slip boundary of slip flow area on the miniature Ranque-Hilsch vortex tube,this paper mainly divides the model by block meshing according to ICEM in ANSYS software,and then simulates it in FLUENT after combining by interface,so as to realize the numerical simulation and analysis of the internal flow field of Ranque-Hilsch vortex tube(RHVT).By comparing the temperature field,velocity field and vortex field of the internal flow field,the variation law of static temperature,total temperature,dynamic temperature and cooling and thermal performance coefficients in the temperature field,the variation law of velocity field and its sub-velocity field,the variation law of positive and negative vortex field in the vortex field,and the clarification of the influence mechanism of size factor,boundary factor and slip boundary of slip flow area on the Ranque-Hilsch vortex tube were analyzed.It is shown that the size factor has a large influence on the internal flow field of RHVT when the size factor is considered alone,which is mainly related to the special structure of RHVT and the physical properties of the fluid.And when the size is small,the conclusions drawn by previous studies on RHVT appear to be somewhat biased.In the case of considering the boundary factor alone,the boundary factor also has a large influence on the internal flow field of RHVT,but it has a certain difference with the influence brought by the size factor.When the dimensional and boundary factors are considered simultaneously,the interaction of the two interacts and the effect on the internal physical field is different from the effect of either of them alone.The slip boundary has a large effect on the internal physical field when in the slip flow region.In addition to some flow fields more similar to the continuous flow region,there are also other flow fields such as similar axial velocity fields,but they have a large difference with them,which has a certain complementary meaning to the blank field of micro RHVT research.The results of this paper provide some data support and theoretical supplement to the study of RHVT,and have certain guiding significance for practical engineering.