Nanofluids, solid-liquid suspensions with solid particles of size of the order of few nanometers, have created interest in many researchers because of their enhancement in thermal conductivity and convective heat transfer characteristics. Many studies have been done on the pool boiling characteristics of nanofluids, most of which have been with nanofluids containing oxide nanoparticles owing to the ease in their preparation. Deterioration in boiling heat transfer was observed in some studies. Metallic nanofluids having metal nanoparticles, which are known for their good heat transfer characteristics in bulk regime, reported drastic enhancement in thermal conductivity. The present paper investigates into the pool boiling characteristics of metallic nanofluids, in particular of nanofluids, on flat copper heater surface. The results indicate that at comparatively low heat fluxes, there is deterioration in boiling heat transfer with very low particle volume fraction of 0.01%, and it increases with volume fraction and shows enhancement with 0.1%. However, the behavior is the other way around at high heat fluxes. The enhancement at low heat fluxes is due to the fact that the effect of formation of thin sorption layer of nanoparticles on heater surface, which causes deterioration by trapping the nucleation sites, is overshadowed by the increase in microlayer evaporation, which is due to enhancement in thermal conductivity. Same trend has been observed with variation in the surface roughness of the heater as well.
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November 2011
This article was originally published in
Journal of Heat Transfer
Research Papers
Pool Boiling Characteristics of Metallic Nanofluids
K. Hari Krishna,
K. Hari Krishna
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
Indian Institute of Technology Madras
, Chennai 600036, India
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Harish Ganapathy,
Harish Ganapathy
Department of Mechanical Engineering,
National Institute of Technology Calicut
, Kerala 673601, India
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G. Sateesh,
G. Sateesh
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
Indian Institute of Technology Madras
, Chennai 600036, India
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Sarit K. Das
Sarit K. Das
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
e-mail: skdas@iitm.ac.in
Indian Institute of Technology Madras
, Chennai 600036, India
Search for other works by this author on:
K. Hari Krishna
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
Indian Institute of Technology Madras
, Chennai 600036, India
Harish Ganapathy
Department of Mechanical Engineering,
National Institute of Technology Calicut
, Kerala 673601, India
G. Sateesh
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
Indian Institute of Technology Madras
, Chennai 600036, India
Sarit K. Das
Department of Mechanical Engineering, Heat Transfer and Thermal Power Laboratory,
Indian Institute of Technology Madras
, Chennai 600036, India
e-mail: skdas@iitm.ac.in
J. Heat Transfer. Nov 2011, 133(11): 111501 (8 pages)
Published Online: August 31, 2011
Article history
Received:
September 12, 2009
Revised:
August 28, 2010
Online:
August 31, 2011
Published:
August 31, 2011
Citation
Krishna, K. H., Ganapathy, H., Sateesh, G., and Das, S. K. (August 31, 2011). "Pool Boiling Characteristics of Metallic Nanofluids." ASME. J. Heat Transfer. November 2011; 133(11): 111501. https://doi.org/10.1115/1.4002597
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