THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Zhifeng Wang

,

Fajing Li

,

Mu Chai

EXPERIMENTAL INVESTIGATION OF FLOW CHARACTERISTICS IN A VERTICAL VIBRATION TWO-PHASE LOOP THERMOSYPHON

ABSTRACT
In this paper, flow characteristics of a two-phase loop thermosyphon under vertical reciprocating vibration are visually investigated with N-pentane as the working fluid. The tests are performed for a heating power range of 20 W to 40 W, the filling ratio of 30 % to 70%, and a 30 m•s-2, 35 Hz vertical reciprocating vibration. The effect of vertical vibration on flow characteristics of the two-phase loop thermosyphon is investigated by comparing the obtained results with those acquired in static, thereby providing a basis for explaining the heat transfer process of two-phase loop thermosyphon under vibration. The results indicate that vertical vibration promotes the rupture of a liquid plug and the transformation of the plug flow to annular flow or wavy flow. Furthermore, the vertical vibration does not change the distribution law of liquid flow velocity in the two-phase loop thermosyphon. However, it will reduce the overheating and flow velocity in the two-phase loop thermosyphon at the start-up. With an increase in the heating power, the influence of vertical vibration on liquid flow velocity is reduced due to continuous disturbance of the working medium in the two-phase loop thermosyphon.
KEYWORDS
two-phase loop thermosyphon, vertical vibration, flow characteristic, Visualization
PAPER SUBMITTED: 2021-10-23
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2022-01-03
PUBLISHED ONLINE: 2022-02-05
DOI REFERENCE: https://doi.org/10.2298/TSCI211023014W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 5, PAGES [4367 - 4376]
REFERENCES
  1. Zhang, H., Shao, S., Jin, T. Numerical investigation of a co2 loop thermosyphon in an integrated air conditioning system for free cooling of data centers. Applied Thermal Engineering. 126 (2017), pp. 1134-1140.
  2. Chen C.X., Cao J.Y., Yu J.G.Characterisation of a controllable loop thermosyphon for precise temperature management. Applied Thermal Engineering, 185 (2021), pp. 116444.
  3. Li F.J., Gao J.M., Shi X.J. Experimental investigation of an R600a two-phase loop thermosiphon to cool a motorized spindle shaft, International Communications in Heat and Mass Transfer, 97 (2018), pp. 9-16.
  4. Shuang Z., Liang W., Ye B. Experimental and theoretical analysis of a closed loop two-phase thermosiphon under various states for latent heat storage.Energy Reports, 6 (2020), pp. 1-7.
  5. Swart, R.T.D. Thermal-hydraulic simulation and evaluation of a natural circulation thermosyphon loop for a reactor cavity cooling system of a hightemperature reactor. Nuclear Engineering and Technology. 52 (2020), pp. 271-278.
  6. Shao S.Q., Liu H.C., Zhang H.N. Experimental investigation on a loop thermosyphon with evaporative condenser for free cooling of data centers. Energy, 185(2019), pp. 829-836.
  7. Yin X., Hu J., Chi X.Y. Experimental investigation of two-phase thermosyphon loop for passive containment cooling. Applied Thermal Engineering, 184 (2021), pp. 116403.
  8. Wang Y.F.,n Wang X.Y., Chen H.J. A combined CFD/visualized investigation of two-phase heat and mass transfer inside a horizontal loop thermosiphon. International Journal of Heat and Mass Transfer, 112(2017), pp. 607-619.
  9. Li F.J., Gao J.M., Shi X.J. Visualization research on a pentane loop thermosyphon for shaft cooling. Heat and Mass Transfer, (2021), pp. 1-10.
  10. 10.Alaei A.M. A new designed heat pipe: an experimental study of the thermal performance in the presence of low-frequency vibrations. Heat and Mass Transfer, 48(2011)4, pp. 719-723.
  11. Chen R.H., Kuo L.W., Lai C.M.. The influence of longitudinal vibrations on the heat transfer performance of inclined heat pipes. Advances in Mechanical Engineering, 7(2015)2..
  12. Arkady V.S. Resonant vibration heat transfer coefficient increase of short low-temperature heat pipes. International Journal of Heat and Mass Transfer, 158(2020), pp. 119764.
  13. Neil F.H., Neil F.H., Bowman W.J. Longitudinal vibration effects on a copper/water heat pipe's capillary limit. Journal of Thermophysics & Heat Transfer, 10(1996)1, pp. 90-96.
  14. Sugimoto K., Kamata Y., Yoshida T. Flow visualization of refrigerant in a self-vibration heat pipe by neutron radiography. Nuclear Instruments & Methods in Physics Research, 605(2009)2, pp.200-208.
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Experimental investigation of flow characteristics in a vertical vibration two-phase loop thermosyphon

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence