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Experimental study on CuO nanoparticles in distilled water and its effect on heat transfer on a vertical surface

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Abstract

The pool boiling characteristics of dilute dispersions of CuO nanoparticles in water were studied at atmospheric pressure on a vertical heating surface. Experimental investigation of different weight concentrations of nanoparticles revealed significant enhancement in heat flux and deterioration in pool boiling. Out of many reasons, nanoparticles coating the heater surface was believed to be the reason behind this. Subsequent inspection of the heater surface showed nanoparticles coating the surface, forming a porous layer. To substantiate the nanoparticle deposition and its effect on heat flux, an investigation was performed by measuring the surface roughness of the heater surface before and after the experiment. While SEM images of the heater surface revealed nanoparticle deposition, measurement of surface roughness of the heater surface confirmed it. Formation of the porous layer on the heater surface as revealed by SEM images provided an excellent location for nucleation sites enhancing heat transfer. However, deterioration in nucleate boiling at different weight concentrations indicated some phenomenon is working behind this.

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Authors and Affiliations

  1. Department of Mechanical Engineering, M.S. Ramaiah Institute of Technology, M S R Nagar, Bangalore, 560054, India

    Ramakrishna N. Hegde

  2. Department of Mechanical Engineering, National Institute of Technology, Surathkal, 575025, India

    Srikanth S. Rao

  3. Reva Institute of Technology, Yelahanka, Bangalore, 560064, India

    R. P. Reddy

Authors
  1. Ramakrishna N. Hegde
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  2. Srikanth S. Rao
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  3. R. P. Reddy
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Correspondence to Ramakrishna N. Hegde.

Additional information

This paper was recommended for publication in revised form by Associate Editor Dongsik Kim

Ramakrishna N. Hegde is working as an assistant professor with 18 years of teaching and industrial experience. He has published/presented over 15 articles in reputed international journals and conferences. He has authored two popular books on heat transfer and power plant engineering. He is an authorized boiler operation engineer and presently involved in active research in the field of heat transfer using nanofluids. His areas of interest include CFD, heat transfer, and boiler operation and maintenance.

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Hegde, R.N., Rao, S.S. & Reddy, R.P. Experimental study on CuO nanoparticles in distilled water and its effect on heat transfer on a vertical surface. J Mech Sci Technol 25, 2927–2934 (2011). https://doi.org/10.1007/s12206-011-0719-y

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  • DOI: https://doi.org/10.1007/s12206-011-0719-y

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