10.1007/s40095-021-00396-y

Effect of spherical internal surface irregularities (SISIs) on thermohydraulic features of modified SSWH riser tube flow

  • Satish Kumar Dewangan*1,
  1. Mechanical Engineering Department, National Institute of Technology, Raipur, CG, 492010, IN

Published in Issue 2021-06-05

How to Cite

Dewangan, S. K. (2021). Effect of spherical internal surface irregularities (SISIs) on thermohydraulic features of modified SSWH riser tube flow. International Journal of Energy and Environmental Engineering, 13(1 (March 2022). https://doi.org/10.1007/s40095-021-00396-y
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Abstract

Abstract Passive techniques in the riser tubes of the simple solar water heater (SSWH) are helpful to enhance the effective conversion of the solar energy into the thermal energy. In the present work, the effectiveness of providing of spherical internal surface irregularities (SISIs) has been analyzed. Three aspects, namely (a) effect of the flow Re variation, (b) effect of the distribution pattern of the SISI for equal total number of SISI and (c) effect of the variation the number of the SISI projections for a given riser tube length, have been studied. Various thermohydraulic features like pressure drop, skin friction coefficient, surface Nusselt number, velocity and temperature contours have been observed as a measure of comparison for these three aspects of analysis. A 3D, steady-state analysis was carried out for laminar flow of the single-phase flow through riser tubes having various arrangements of SISI. The flow Reynolds number from 400 to 1000 range has been studied for water and water-based nanofluids using the ANSYS Fluent software. Summarily, it was concluded that the application of SISI leads to natural thermal enhancement for SSWH; however, its distribution pattern also matters.

Keywords

  • Solar energy-based systems (SEBS),
  • Modified simple solar water heater (MSSWH),
  • Enhanced heat transfer,
  • Spherical internal surface irregularity (SISI),
  • Enhanced flow,
  • Nanofluids

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