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Enhancement of nucleate pool boiling heat transfer coefficient by reentrant cavity surfaces

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Abstract

The pool boiling of acetone, isopropanol, ethanol and water at atmospheric pressure has been carried out on a plain tube, and five different reentrant cavity (REC) heating tubes. The heat flux has remained in a range of 11–42 kW/m2 for all the heating tubes. The enhancement factor, E, has been found to increase with the rise in heat flux, irrespective of the boiling liquid and the test-section tube combinations. For the pool boiling of acetone and isopropanol, the maximum enhancement factor has been attained for REC-2 tube with mouth size of 0.3 mm and for ethanol and water the mouth size could not be optimized, however, the maximum enhancement factor has been attained for REC-4 tube with mouth size of 0.2 mm. A correlation has also been developed to predict the enhancement factor, E, for the pool boiling of the test-liquids on REC heating tubes. This correlation has predicted the enhancement factor, E, in an error band of +12.5 to −7.5%.

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Authors and Affiliations

  1. Jawaharlal Nehru Technological University, Kukatpally, Andhra Pradesh, India

    K. G. Rajulu

  2. Indian Institute of Technology Roorkee, Roorkee, India

    Ravi Kumar & Bikash Mohanty

  3. Ideal Institute of Technology, Gahaziabad, India

    H. K. Varma

Authors
  1. K. G. Rajulu
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  2. Ravi Kumar
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  3. Bikash Mohanty
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  4. H. K. Varma
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Correspondence to Ravi Kumar.

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Rajulu, K.G., Kumar, R., Mohanty, B. et al. Enhancement of nucleate pool boiling heat transfer coefficient by reentrant cavity surfaces. Heat Mass Transfer 41, 127–132 (2004). https://doi.org/10.1007/s00231-004-0526-4

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  • DOI: https://doi.org/10.1007/s00231-004-0526-4

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