THERMAL SCIENCE

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Authors of this Paper

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Jinwang Li

,

Ningxiang Lu

,

Tianshu Cong

EXPERIMENTAL STUDY ON EVAPORATION-CAPILLARY PUMPING FLOW IN CAPILLARY WICK AND WORKING FLUID SYSTEM

ABSTRACT
The evaporation-capillary pumping flow of the capillary wick and the working fluid system was experimentally studied in this paper. The capillary wick used in the experiment was fiber, and the working fluid contained water, ethanol and ethanol aqueous solution with water content of 25, 50, and 75 wt.%. The results show that the capillary pumping rate with ethanol as working fluid is in range 210.0-1812.5 kg/m2s when there is no heat load added. When the heating flux is 10616, 15924, 21231, and 26539 W/m2, the evaporation-capillary pumping rate is 102.5, 247.5, 390.0, and 530.0 kg/m2s, respectively. The higher the heat load power, the greater the evaporation-capillary pumping rate and the higher the final stable temperature. With the increase of heat load power, the time required to reach temperature balance becomes shorter and the temperature fluctuations after reaching temperature equilibrium become larger. The obvious temperature fluctuation has occurred when the heat flux is 26539 W/m2. The evaporation capillary pumping rate corresponding to the four different concentrations of ethanol solution in the experiment gradually decreases with the increase of water content. The temperature change processes and the final equilibrium temperatures of the four working fluids are nearly the same. The differences in boiling point of the working fluids do not have much influence here.
KEYWORDS
evaporation, capillary pumping flow, capillary wick, working fluid
PAPER SUBMITTED: 2018-09-18
PAPER REVISED: 2019-09-29
PAPER ACCEPTED: 2019-10-26
PUBLISHED ONLINE: 2019-11-17
DOI REFERENCE: https://doi.org/10.2298/TSCI180918413L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 1, PAGES [367 - 375]
REFERENCES
  1. Cao, Y. and Faghri, A., A Review on Micro/Miniature Heat Pipes, Journal of Enhanced Heat Transfer , 2017, 24, (1 6), pp. 473 482.
  2. Ozturk, A., Ozalp, M., Sozen, A., and Guru, M., Performance Improvement of the Heat Recovery Unit with Sequential Type Heat Pipes Using Tio2 Nanofluid, Thermal Science, 2019, 23, (3), pp. 1755 1764.
  3. Krambeck, L., Baptista Nishida, F., Marrone De Aguiar, V., Dias Dos Santos, P.H., and Antonini Alves, T., Thermal Performance Evaluation of Different Passive Devices for Electronics Cooling, Thermal Science , 2019, 23, (2), pp. 1151 1160.
  4. Giraudon, R., Li ps, S., Fabrègue, D., Gremillard, L., Maire, E., and Sartre, V., Effect of the Wick Characteristics on the Thermal Behaviour of a Lhp Capillary Evaporator, International Journal of Thermal Sciences , 2018, 133, pp. 22 31.
  5. Yeh, C.C., Liu, B.H., and Chen , Y.M., A Study of Loop Heat Pipe with Biporous Wicks, Heat and Mass Transfer , 2008, 44, (12), pp. 1537 1547.
  6. Iverson, B.D., Davis, T.W., Garimella, S.V., North, M.T., and Kang, S.S., Heat and Mass Transport in Heat Pipe Wick Structures, Journal of Th ermophysics and Heat Transfer 2007, 21, (2), pp. 392 404.
  7. Diamantis, Z.G., Photeinos, D.I., Margaris, D.P., and Tsahalis, D.T., Performance of Heat Pipes as Capillary Pumps: Experiments, International Journal of Low Carbon Technologies 2007, 2, (1), p p. 30 43.
  8. Kaya, T. and Goldak, J., Numerical Analysis of Heat and Mass Transfer in the Capillary Structure of a Loop Heat Pipe, International Journal of Heat and Mass Transfer 2006, 49, (17 18), pp. 3211 3220.
  9. Huang, X.M. and Liu, W., A Mathemati cal Model to Analyze Heat and Mass Transfer Characteristics of a Cpl Evaporator Porous Wick, Heat Transfer Asian Research, 2005, 34, (4), pp. 209 218.
  10. Ren, C., Wu, Q.S., and Hu, M.B., Heat Transfer with Flow and Evaporation in Loop Heat Pipe's Wick a t Low or Moderate Heat Fluxes, International Journal of Heat and Mass Transfer Mass Transfer 2007, 50, (112007, 50, (11-12), pp. 229612), pp. 2296-2308.2308.
  11. Ku, J.T., Ottenstein, L., Kobel, M., Rogers, P., and Kaya, T., Temperature Oscillations in Loop Heat Pipe Operation, Loop Heat Pipe Operation, Space Technology and Space Technology and Applications International Applications International Forum-2001, 2001, 552, pp. 255-262.
  12. Vershinin, S.V. and Maydanik, Y.F., Investigation of Pulsations of the Operating Temperature in a Miniature Loop Heat Pipe, International Journal of Heat and Mass 2007, 50, pp. 5232-5240.
  13. Li, J., Wang, D., and Peterson, G.P., Experimental Studies on a High Performance Compact Loop Heat Pipe with a Square Flat Evaporator, Applied Thermal Engineering Applied Thermal Engineering 2010, 30, pp. 741-752.
  14. Singh, R., Akbarzadeh, A., and Mochizuki, M., Operational Characteristics of a Mochizuki, M., Operational Characteristics of a Miniature Loop Heat Pipe with Flat Evaporator, International Journal of Thermal International Journal of Thermal Sciences Sciences 2008, 47, (11), pp. 1504-1515.
  15. Celata, G.P., Cumo, M., and Furrer, M., Experimental Tests of a Stainless Steel Loop op Heat Pipe with Flat Evaporator, Heat Pipe with Flat Evaporator, Experimental Thermal and Fluid Science Experimental Thermal and Fluid Science 2010, 34, (7), 2010, 34, (7), pp. 866-878.
  16. Ren, C., Wu, Q.S., and Hu, M.B., Heat Transfer in Loop Heat Pipe's Wick: Effect of Porous Structure Parameters, Journal of Thermophysics and Heat Journal of Thermophysics and Heat Transfer 2007, 21, pp. 702-711.
  17. Williams, R.R. and Harris, D.K., A Device and Technique to Measure the Heat Transfer Limit of a Planar Heat Pipe Wick, Limit of a Planar Heat Pipe Wick, Experimental Thermal and Fluid Science Experimental Thermal and Fluid Science 2006, 30, (3), 2006, 30, (3), pp. 277-284.
  18. Ren, C. and Wu, Q.S., Heat Transfer in Loop Heat Pipes Capillary Wick: Effect ransfer in Loop Heat Pipes Capillary Wick: Effect Effective Thermal Conductivity, Journal of Thermophysics and Heat Transfer 2007, 21, 2007, 21, (1), pp. 134-140.
  19. Huang, X., Franchi, G., and Cai, F., Characterization of Porous Bi-Modal Ni Structures, Journal of Porous Materials 2009, 16, (2), pp. pp. 165-173.
  20. Okada, K., Uchiyama, S., Isobe, T., Kameshima, Y., Nakajima, A., and Kurata, T., Capillary Rise Properties of Porous Mullite Ceramics Prepared by an Extrusion Method Using Organic Fibers as the Pore Former, Journal of the European Ceramic Society 2009, 29, (12), pp. 2491-2497.
  21. Singh, R., Akbarzadeh, A., and Mochizuki, M., Experimental Determination of Wick Properties for Loop Heat Pipe Applications, Journal of Porous MediaJournal of Porous Media, 2009, 12, (8), pp. 759-776.
  22. Caupin, F., Cole, M.W., Balibar, S., and Treiner, J., Absolute Limit for the Capillary Rise of a Fluid, 2008, 82, p. 56004.
  23. Li, J., Zou, Y., and Cheng, L., Experimental Study on Capillary Pumping Performance of Porous Wicks for Loop Heat Pipe, Experimental Thermal and Fluid Science Experimental Thermal and Fluid Science, 2010, 34, , 2010, 34, (8), pp. 1403-1408.
  24. Li, J., Zou, Y., Cheng, L., Singh, R., and Akbarzadeh, A., Effect of Fabricating Parameters on Properties of Sintered Porous Wicks for Loop Heat Pipe, Powder Powder Technology, 2010, 204, pp. 241-248.
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Experimental study on evaporation-capillary pumping flow in capillary wick and working fluid system

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