Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Heat Transfer Research
Facteur d'impact: 1.199 Facteur d'impact sur 5 ans: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

Volumes:
Volume 51, 2020 Volume 50, 2019 Volume 49, 2018 Volume 48, 2017 Volume 47, 2016 Volume 46, 2015 Volume 45, 2014 Volume 44, 2013 Volume 43, 2012 Volume 42, 2011 Volume 41, 2010 Volume 40, 2009 Volume 39, 2008 Volume 38, 2007 Volume 37, 2006 Volume 36, 2005 Volume 35, 2004 Volume 34, 2003 Volume 33, 2002 Volume 32, 2001 Volume 31, 2000 Volume 30, 1999 Volume 29, 1998 Volume 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018021260
pages 1319-1332

EFFECT OF LOW WICK PERMEABILITY ON TRANSIENT AND STEADY-STATE PERFORMANCE OF HEAT PIPES

Q. Chen
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
Yonghua Huang
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

RÉSUMÉ

Novel wicks made of micro/nanopillar array or carbon nanotube array have the advantages of superhigh capillary pressure and compact dimensions, which is attractive for applications like smartphones. However, much lower permeability becomes the dominant shortcoming compared to conventional wicking structures. This work presents an investigation of the effects of low-permeability wick on various aspects of the heat pipe performance, by assigning the permeability as the parametric control variable. The transient process as well as steady state have been numerically solved by an efficient heat pipe simulation tool LVHPM. Heat pipe performances with wicks covering a wide range of permeability have been studied in terms of the mass flow, temperature, and pressure influences. Calculation results showed that with decrease of the permeability, the growth of flow resistance in the wick is faster than the capillary pressure, resulting in lower capillary limit. Further, the effect of permeability on the coupled fluid flow and heat transfer inside the heat pipe was investigated, assuming that the heat load is within moderate range. The velocity was shown to be more evenly distributed for lower permeability, but the total mass flux was insensitive to it. Steady-state temperature distribution was weakly related to wick permeability, whereas the transient temperature presented stronger dependence with permeability, showing faster response at smaller permeability. During the transition of external heat loads, pressure drop inside the wick was found being established in a short time.

RÉFÉRENCES

  1. Cai, Q. and Bhunia, A., High Heat Flux Phase Change on Porous Carbon Nanotube Structures, Int. J. Heat Mass Transf, vol. 55, nos. 21-22, pp. 5544-5551,2012.

  2. Cai, Q. and Chen, C.L., Design and Test of Carbon Nanotube Biwick Structure for High-Heat-Flux Phase Change Heat Transfer, J. Heat Transf., vol. 132, no. 5, p. 052403,2010.

  3. Chen, Q. and Huang, Y., Scale Effects on Evaporative Heat Transfer in Carbon Nanotube Wick in Heat Pipes, Int. J. Heat Mass Transf, vol. 111, pp. 852-859,2017.

  4. Dunn, P., Heat Pipes, 4th Edition, Oxford, UK: Pergamon, 1994.

  5. Guo, Z. and Zhao, T., Lattice Boltzmann Model for Incompressible Flows through Porous Media, Phys. Rev, vol. 66, no. 3, p. 036304, 2002.

  6. Huang, Y. and Chen, Q., A Numerical Model for Transient Simulation of Porous Wicked Heat Pipes by Lattice Boltzmann Method, Int. J. Heat Mass Transf., vol. 105, pp. 270-278,2017.

  7. Ishino, C., Reyssat, M., Reyssat, E., Okumura, K., and Quere, D., Wicking within Forests of Micropillars, Europhys. Lett. (EPL), vol. 79, no. 5, p. 56005,2007.

  8. Kousalya, A.S., Weibel, J.A., Garimella, S.V., and Fisher, T.S., Metal Functionalization of Carbon Nanotubes for Enhanced Sintered Powder Wicks, Int. J. Heat Mass Transf, vol. 59, pp. 372-383,2013.

  9. Lin, Y.J. and Hwang, K.S., Effects of Particle Size and Particle Size Distribution on Heat Dissipation of Heat Pipes with Sintered Porous Wicks, Metal. Mater. Trans. A, vol. 40, no. 9, pp. 2071-2078,2009.

  10. Liou, J.H., Chang, C.W., Chao, C., and Wong, S.C., Visualization and Thermal Resistance Measurement for the Sintered Mesh-Wick Evaporator in Operating Flat-Plate Heat Pipes, Int. J. Heat Mass Transf., vol. 53, nos. 7-8, pp. 1498-1506,2010.

  11. Mattia, D., Leese, H., and Lee, K.P., Carbon Nanotube Membranes: from Flow Enhancement to Permeability, J. Membrane Sci., vol. 475, pp. 266-272,2015.

  12. Mistry, P., Thakkar, F., De, S., and Das Gupta, S., Experimental Validation of a Two-Dimensional Model of the Transient and Steady-State Characteristics of a Wicked Heat Pipe, Experimental Heat Transf., vol. 23, no. 4, pp. 333-348,2010.

  13. Mwaba, M.G., Huang, X., and Gu, J., Influence of Wick Characteristics on Heat Pipe Performance, Int. J. Energy Res, vol. 30, no. 7, pp. 489-499,2006.

  14. Nithiarasu, P., Seetharamu, K., and Sundararajan, T., Natural Convective Heat Transfer in a Fluid Saturated Variable Porosity Medium, Int. J. Heat Mass Transf., vol. 40, no. 16, pp. 3955-3967,1997.

  15. Ranjan, R., Garimella, S.V., Murthy, J.Y., and Yazawa, K., Assessment ofNanostructured Capillary Wicks for Passive Two-Phase Heat Transport, Nanoscale Microscale Thermophys. Eng., vol. 15, no. 3, pp. 179-194,2011.

  16. Ravi, S., Horner, D., and Moghaddam, S., Mass Transport Characteristics and Theoretical Performance Limits of Micropillar Wicks, Orlando, FL, pp. 1228-1234,2014.

  17. Ren, C., Parametric Effects on Heat Transfer in Loop Heat Pipe's Wick, Int. J. Heat Mass Transf., vol. 54, nos. 17-18, pp. 3987-3999,2011.

  18. Ryu, S., Lee, W., and Nam, Y., Heat Transfer and Capillary Performance of Dual-Height Superhydrophilic Micropost Wicks, Int. J. Heat Mass Transf., vol. 73, pp. 438-444,2014.

  19. Schrage,R., A Theoretical Study of Interphase Mass Transfer, New York: Columbia University Press, 1953.

  20. Singh, R., Akbarzadeh, A., and Mochizuki, M., Effect of Wick Characteristics on the Thermal Performance of the Miniature Loop Heat Pipe, J. Heat Transf., vol. 131, no. 8, p. 082601,2009.

  21. Yazdchi, K., Srivastava, S., and Luding, S., Microstructural Effects on the Permeability of Periodic Fibrous Porous Media, Int. J. Multiphase Flow, vol. 37, no. 8, pp. 956-966,2011.

  22. Zhu, Y., Antao,D.S.,Lu, Z., Somasundaram, S., Zhang, T., and Wang, E.N., Prediction and Characterization of Dry-Out Heat Flux in Micropillar Wick Structures, Langmuir, vol. 32, no. 7, pp. 1920-1927,2016.


Articles with similar content:

DESIGN, MANUFACTURING, AND CHARACTERIZATION OF COPPER CAPILLARY STRUCTURES FOR LOOP HEAT PIPES
Heat Pipe Science and Technology, An International Journal, Vol.8, 2017, issue 1
Valerie Sartre, Rémi Giraudon, Stephane Lips, D. Fabregue, L. Gremillard, E. Maire
EVAPORATOR HEAT-TRANSFER ANALYSIS OF A LOOP HEAT PIPE WITH LOW THERMAL CONDUCTIVITY WICKS
Heat Pipe Science and Technology, An International Journal, Vol.5, 2014, issue 1-4
Hosei Nagano, M. Nishikawara, M. Prat
PRODUCTIVITY EQUATIONS FOR A MULTIPLE-WELL SYSTEM IN CIRCULAR AND RECTANGULAR RESERVOIRS
Special Topics & Reviews in Porous Media: An International Journal, Vol.3, 2012, issue 4
Djebbar Tiab, Shawket Ghedan, Jing Lu
Experimental study of natural convection and phase transition coupling heat sink with temperature uniformity
International Heat Transfer Conference 16, Vol.18, 2018, issue
Hao Chen, Qiang Li
STEADY STATE OPERATION OF CYLINDRICAL LOOP HEAT PIPE EVAPORATORS
International Heat Transfer Conference 13, Vol.0, 2006, issue
J. Perez, Jay M. Ochterbeck, Z. Wang, Paul Rogers