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Optimum spacing between grooved tubes: An experimental study

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Abstract

An experimental study on optimum spacing between grooved tubes is reported in this paper. Two grooved tubes having pitch of 10 mm and 15 mm and a plain tube were considered for the heat transfer analysis. The spacing between two tubes with same pitch was varied from 10 mm to 35 mm with a step size of 5 mm. Velocity of air flowing over the tube surfaces was changed from 0.4 m/s to 1 m/s using a blower fan. Based on Nusselt number (Nu) the optimum spacing between the tubes was decided. The optimum spacing between grooved tubes of pitch 10 mm and 15 mm was compared with that of plain tubes. From the experimental analysis it was noticed that with increase in air velocity (increase in Reynolds number) the tube surface temperature reduced irrespective of any tube considered. Nu increased with increase in air velocity for all the tubes. The important conclusion drawn from the present study was that, there exists a limiting spacing (optimum) between the tubes above which no change in Nu was observed. Spacing of 30 mm was found to be the optimum spacing between the tubes irrespective of its surface geometry modifications.

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, P. A. College of Engineering, Visvesvaraya Technological University, Mangaluru, India

    Asif Afzal & R. K Abdul Razak

  2. Department of Mechanical Engineering, N. K. Orchid College of Engineering, Solapur, India

    A. D Mohammed Samee

  3. Department of Mechanical Engineering, International Islamic University Malaysia, Kuala Lumpur, Malaysia

    Sher Afghan Khan

  4. Department of Mechanical Engineering, HMS Institute of Technology, Tumkur, India

    Hurmathulla Khan

Authors
  1. Asif Afzal
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  2. A. D Mohammed Samee
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  3. R. K Abdul Razak
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  4. Sher Afghan Khan
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  5. Hurmathulla Khan
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Corresponding author

Correspondence to Asif Afzal.

Additional information

Recommended by Editor Yong Tae Kang

Asif Afzal has obtained his maters and doctorate from Visvesvaraya Technological University Belagavi. His areas of research interest is heat transfer and parallel CFD.

Mohammed Samee has published several articles in international peer reviewed journals and has obtained Ph.D. in the area of experimental heat sinks and fluid flow.

Abdul Razak is working in the area of computational thermal sciences and has received several funding’s from several central agencies of India.

S. A. Khan is a Professor in IIUM, Malaysia. His students have worked in the area of experimental fluid flow and gas dynamics.

Hurmathulla Khan is Assistant Professor in HMSIT, Tumkur. His specialization is in the field of heat transfer in industrial phenomena’s, energy utilization, and solar materials.

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Afzal, A., Mohammed Samee, A.D., Abdul Razak, R.K. et al. Optimum spacing between grooved tubes: An experimental study. J Mech Sci Technol 34, 469–475 (2020). https://doi.org/10.1007/s12206-019-1244-7

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  • DOI: https://doi.org/10.1007/s12206-019-1244-7

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