Title: Energy and exergy analyses to enhance the performance of coiled-tube heat exchanger by employing water/Al₂O₃ nanofluid

Authors: Esam I. Jassim

Addresses: Mechanical Engineering Department, Prince Mohammad Bin Fahd University, Al Khobar-31952, Saudi Arabia

Abstract: The purpose of this research is to experimentally evaluate the degree of enhancement in the heat transfer and entropy generation when nanoparticles mix with ordinary water. Several concentrations of Al₂O₃ nanoparticles at various flowrates are investigated to assess the enhancement in the exchanger's (NTU) and efficiency. Results illustrate that the heat exchanger performance enhances up to 27% due to presence of nanoparticles and is supplemented with the increase of the volume fraction as well as the nanofluid flowrate. Numerically speaking, the total irreversibility decreases by 47% at volume concentration of 0.5% although the frictional source augments by 27%.

Keywords: Al₂O₃ nanoparticles; coiled tube heat exchanger; efficiency; exergy; nanofluid.

DOI: 10.1504/IJEX.2023.131894

International Journal of Exergy, 2023 Vol.41 No.3, pp.270 - 281

Received: 28 Sep 2022
Received in revised form: 04 Mar 2023
Accepted: 04 Mar 2023
Published online: 04 Jul 2023 *

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