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Indexed by:期刊论文

Date of Publication:2018-01-01

Journal:INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID

Included Journals:SCIE、EI

Volume:85

Page Number:42-57

ISSN No.:0140-7007

Key Words:Ranque-Hilsch vortex tube; Vortex breakdown; Flow structure; Energy separation performance; Cold mass fraction

Abstract:The flow structure and energy separation considering the effect of cold mass fraction in a Ranque-Hilsch vortex tube were investigated computationally based on the vortex breakdown theory. The velocity distributions and pressure fields for nine different cold mass fractions were considered. A quasi-cylindrical approximation was adopted to predict the size of the vortex core size by considering the pressure gradient. Further, a novel analysis was conducted on the energy separation mechanism, in which the large-scale vortex structure plays an important role; for example, increasing the cold mass fraction within a certain range can result in bigger vortex cores, yielding better energy separation performance. Finally, the type of vortex breakdown was also discussed for further understanding the vortex structure. This paper offers a new idea on the manner in which the external conditions (here, cold mass fraction) affect the large-scale vortex structure and on the subsequent energy separation performance. (C) 2017 Elsevier Ltd and IIR. All rights reserved.