Author
Bo Liu
Bio: Bo Liu is an academic researcher from Dalian University of Technology. The author has contributed to research in topics: Vortex tube & Vortex. The author has an hindex of 2, co-authored 4 publications receiving 33 citations.
Topics: Vortex tube, Vortex, Body orifice, Turbulence, Mean flow
Papers
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TL;DR: In this paper, a critical review and discussion on the current studying methods, findings and differences on the flow structures in vortex tube is presented, and future scopes were proposed on the experimentally and theoretically verification of these flow structures and their effects on the energy separation process and performance.
Abstract: Various methods had been taken for the flow field studies, among them, qualitative visualizations and probe intrusive measurements have a long history and had been adopted since last 50s, while laser non-intrusive measurements and numerical simulations are the emerging methods, especially the former. Nowadays, more and more researchers have realized there are specific and regular flow structures in the strong turbulence of vortex tube, and the flow structures have great significance on understanding the energy separation process and performance. However, there still did not exist a review on the flow structure studies. The aim of this paper is to offer a critical review and discussion on the current studying methods, findings and differences on the flow structures in vortex tube. In addition, future scopes were proposed on the experimentally and theoretically verification of these flow structures and their effects on the energy separation process and performance.
31 citations
TL;DR: In this paper, a 2D laser Doppler velocimetry (LDV) measurement was adopted to investigate the mean flow field on the meridian plane, and 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.
Abstract: 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.
29 citations
TL;DR: In this article, the authors analyzed the precessing frequency characteristics of a vortex tube with a diameter of 30mm and the energy separation process and performance under increasing inlet pressure, and the pattern of large-scale vortices and energy separation of the vortex tube were determined.
9 citations
TL;DR: In this article, the relationship between the flow structures in the vortex tube and its coordinated variation of the performance is numerically investigated and it is shown that the poor performance of vortex tubes is possibly due to the morbid flow structure controlling in it.
Abstract: In this paper, the relationship between the flow structures in the vortex tube and its coordinated variation of the performance is numerically investigated. It is shown that the poor performance of vortex tubes is possibly due to the morbid flow structure controlling in it. A new method of managing the flow structures inside the vortex tube to achieve best suitable to the operation condition with a variable cold orifice ratio is proposed. Different cold orifice ratios, ranging from 0.3
4 citations
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TL;DR: In this paper, a critical review and discussion on the current studying methods, findings and differences on the flow structures in vortex tube is presented, and future scopes were proposed on the experimentally and theoretically verification of these flow structures and their effects on the energy separation process and performance.
Abstract: Various methods had been taken for the flow field studies, among them, qualitative visualizations and probe intrusive measurements have a long history and had been adopted since last 50s, while laser non-intrusive measurements and numerical simulations are the emerging methods, especially the former. Nowadays, more and more researchers have realized there are specific and regular flow structures in the strong turbulence of vortex tube, and the flow structures have great significance on understanding the energy separation process and performance. However, there still did not exist a review on the flow structure studies. The aim of this paper is to offer a critical review and discussion on the current studying methods, findings and differences on the flow structures in vortex tube. In addition, future scopes were proposed on the experimentally and theoretically verification of these flow structures and their effects on the energy separation process and performance.
31 citations
TL;DR: In this article, the authors focus on perfect gas models developed to predict the performances of counterflow vortex tubes, including empirical and thermodynamics models, models of heat exchangers, models based on a pressure gradient, models on the momentum transfer with particles spinning inward and models on unsteady phenomena like the vortex breakdown.
28 citations
22 citations
TL;DR: In this article, the potential of integrating a Ranque-Hilsch vortex tube (RHVT) in the precooling process for refueling high-pressure hydrogen vehicles in hydrogen refueling stations is investigated.
21 citations
TL;DR: In this article, a novel association between temperature gradient magnitude with thermo-physical properties of VT material has been proposed, which indicated performance improvement with increase in entry pressure for all materials tested.
19 citations