Experimental investigation of flow structure and energy separation of Ranque–Hilsch vortex tube with LDV measurement
| Autor: | Bo Zhang, Tinghuang Fu, Xiangji Guo, Bo Liu, Ling Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Vortex tube
Materials science 020209 energy Mechanical Engineering Flow (psychology) Boundary (topology) 02 engineering and technology Building and Construction Mechanics Laser Doppler velocimetry 021001 nanoscience & nanotechnology Vortex 0202 electrical engineering electronic engineering information engineering Mean flow Tube (fluid conveyance) 0210 nano-technology Axial symmetry |
| Zdroj: | International Journal of Refrigeration. 101:106-116 |
| ISSN: | 0140-7007 |
| DOI: | 10.1016/j.ijrefrig.2019.02.004 |
| Popis: | In this study, transparent vortex tubes of diameter 30 mm were designed for the main tube visualisation and a 2D laser Doppler velocimetry (LDV) measurement was adopted to investigate the mean flow field on the meridian plane. The distributions of the axial and radial velocities, and particularly the reverse flow boundary, were obtained for understanding the characteristics of large-scale vortex structures. Various operation conditions with different cold mass fractions (0.1–0.9), tube lengths (360 mm, 600 mm, and 900 mm), and inlet pressures (0.1 bar and 0.2 bar) were studied to reveal how the reverse flow boundary affects the energy separation performance. The LDV results show that the mean axial velocity distribution present good axial symmetry, and increasing the cold mass fraction results in an expansion of the reverse flow boundary as reported for previous numerical calculations. A deterioration in the energy separation performance due to an excessively short or long tube was revealed, and the proposed tube optimization criteria were proven. |
| Databáze: | OpenAIRE |
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