10.1007/s40089-020-00321-x

Numerical investigation of second law analysis of PGGNP/H2O nanofluid in various converging pipes

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  • Adefope Adeyanju Owojori*1,
  • Bolanle Adeola Olokuntoye2,
  • Olatomide Gbenga Fadodun3,
  1. Department of Physics and Engineering Physics, Obafemi Awolowo University, Ife, NG
  2. Department of Mathematics Obafemi, Awolowo University, Ife, NG
  3. Centre for Energy Research and Development, Obafemi Awolowo University, Ife, NG

Published in Issue 2021-01-06

How to Cite

Owojori, A. A., Olokuntoye, B. A., & Fadodun, O. G. (2021). Numerical investigation of second law analysis of PGGNP/H2O nanofluid in various converging pipes. International Nano Letters, 11(1 (March 2021). https://doi.org/10.1007/s40089-020-00321-x
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Abstract

Abstract This paper studies entropy production rate of propylene glycol-treated graphene nanoplatelet-based water (PGGNP-water) nanofluid flowing through three converging pipes (linear, Bessel and exponential) in laminar flow regime using computational fluid dynamics. The simulation is performed for range of Reynolds number 400≤Re≤1600\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {400 \le Re \le 1600} \right)$$\end{document} and nanoparticle concentration 0%≤φ≤0.1%\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {0\% \le \varphi \le 0.1\% } \right)$$\end{document} . The effect of Reynolds number and nanoparticle concentration were investigated on entropy production rates and Bejan number. The result showed that thermal entropy production rate of nanofluid in converging pipes was lower compared with straight pipes. In addition, increase in Reynolds number enhances viscous entropy production rate but decreases thermal entropy production rate. Furthermore, increase in nanoparticle concentration by 0.1% enhanced the viscous entropy production rate by a factor of 48.93 and reduced the thermal entropy production rate by 18.69%.

Keywords

  • Thermal entropy,
  • Viscous entropy,
  • Nanofluid,
  • Reynolds number,
  • Converging pipe,
  • Bejan number,
  • Heat transfer

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