Best vortex tube cascade for highest thermal separation

•Cascade arrangements of VT are investigated for thermal separation.•Effects of thermo-physical parameters on temperature separation are investigated.•A simple new equation for hot outlet temperature estimation is proposed.•Optimal heat separation in a cascade of three VT and a HEX is reported.•Recy...

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Bibliographic Details
Published in:International journal of refrigeration 2018-01, Vol.85, p.282-291
Main Authors: Majidi, Davood, Alighardashi, Hashem, Farhadi, Fatola
Format: Article
Language:English
Subjects:
Cold pressing
Cooling
Cooling effects
Cooling/heating
Experiment
Expérimentation
Heat exchangers
Heating
Physical properties
Refroidissement/chauffage
Simulation
Studies
Temperature
Temperature gradients
Tube vortex
Tubes
Vortex tube
Vortices
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Summary:•Cascade arrangements of VT are investigated for thermal separation.•Effects of thermo-physical parameters on temperature separation are investigated.•A simple new equation for hot outlet temperature estimation is proposed.•Optimal heat separation in a cascade of three VT and a HEX is reported.•Recycling for feed cooling in cascades cannot always enhance the thermal separation. The current study examines different arrangements of vortex tubes (VTs) to get higher performances for cooling and heating. The effects of thermo-physical parameters such as inlet feed temperature and inlet/outlet vortex tube pressure on generated temperature gradient are investigated. To estimate the cold outlet temperatures, the available equations in the literature are verified against our experimental data. Moreover, we propose a new equation to estimate the hot outlet temperature based on the upper limit of hot temperature (ULHT) and the lower limit of cold temperature (LLCT), verified with experimental data as well. Further, several arrangements are simulated to obtain the minimum cold and the maximum hot temperatures for the outlet streams. Finally, the optimal arrangement of the three vortex tubes and a double-pipe helical heat exchanger that gives the highest performance is proposed.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2017.10.006