Exergy analysis of the flow process and exergetic optimization of counterflow vortex tubes working with air

Application of new series connection scheme of vortex tubes in seawater desalination unit using new vortex generators

“…They reported that the energy separation at both cold and hot ends was better in case of using air as a working medium [21] rather than hydrogen. On the other hand, the performance of RHVT could be optimized and the energy was saved in case of using ejector with the RHVT as reported by Lagrandeur et al [22].…”

Research on the prediction model of energy separation effect of vortex tube based on trajectory deflection characteristics and its numerical solution method

“…Fig. 3 (b) shows the expansion flow behavior of the fluid microelement when it enters the vortex chamber under the effect of air pressure difference, and this behavior is divided into two processes for ease of solution: isothermal expansion along the z-direction and isotropic expansion along the circumferential direction [ 4 , [28] , [29] , [30] ].…”

“…However, Balmer [ 3 ] found in experiments with high-pressure water as a medium that the same energy separation phenomenon can be produced when the incident water pressure is sufficiently high. Lagrandeur et al [ 4 ] highlight the perfect gas model developed to predict the performance of counter-current vortex tubes, explaining that the tangential velocity profile can change from a forced vortex to a Rankine vortex. However, their model cannot predict the geometrical parameters of the vortex tube and theories relating to vortex decomposition and good positioning need to emerge.…”

Multiobjective Optimization Of Vortex Tubes Integrated In A Trigenerative Compressed Air Energy Storage System

“…Reference Objective [25] Exergy efficiency and total product unit cost [26] Exergy efficiency and exergy density [27] Total cost, offset of the CAES and energy saving ratio [28] Global exergetic efficiency [29] Round trip efficiency and annual cost saving For both vortex tubes, P 0in , T 0in andṁ in are either fixed values of the problem or calculate from the previous vortex tube in the cascade. For both vortex tubes, the genetic algorithm identifies the optimum values of Ma in , Ma z , µ c and r c /r vt as done by [13]. These parameters may vary in the ranges: Ma in = [0.7 − −0.95], Ma z = [0.1 − −0.5], µ c = 0.5 − −0.9] and r c /r vt = [0.3 − −0.6].…”

“…Recently, a thermodynamic model achieved a good quantitive and qualitative prediction of the outlet temperature of vortex tubes working with air [12]. This model was used to optimize the exergetic efficiency of vortex tubes [13]. Among other conclusions, they found that the exergetic efficiency of vortex tubes increases when they are used at higher pressure.…”