Title: Evaluation of entropy generation in different microchannels and heat transfer properties in a triangular microchannel

Authors: Brahim Kalech; Hana Ouri; Mourad Bouterra

Addresses: Laboratory of Energizing and Thermal and Mass Transfer (LETTM), Faculty of Sciences of Tunis, Department of Physics, University of Tunis-El Manar, 2092 ElManar, Tunis, Tunisia ' Laboratory of Energizing and Thermal and Mass Transfer (LETTM), Faculty of Sciences of Tunis, Department of Physics, University of Tunis-El Manar, 2092 ElManar, Tunis, Tunisia ' Laboratory of Energizing and Thermal and Mass Transfer (LETTM), Faculty of Sciences of Tunis, Department of Physics, University of Tunis-El Manar, 2092 ElManar, Tunis, Tunisia

Abstract: This study investigates the effects of nanoparticles in a water-based fluid on minimising entropy generation in a microchannel, with nanoparticle volume concentrations of 2% at 6%. The total entropy generation rates of nanofluids have been analysed in different cross-sectional shapes of microchannels. Nanofluid mixtures were studied under varying wall heat flux levels, and the total entropy generation rates were compared for three different types of nanofluids. This investigation introduces a model to calculate the dimensionless entropy generation for various duct cross-sections. The results indicate that the minimum total entropy generation value was observed for the nanofluid CuO-water with a concentration of 6% in the equilateral triangular cross-section duct.

Keywords: microchannel; nanofluid; entropy generation; thermophysical properties; heat transfer; thermodynamic optimisation.

DOI: 10.1504/IJEX.2024.142625

International Journal of Exergy, 2024 Vol.45 No.3/4, pp.192 - 206

Received: 06 Jul 2024
Accepted: 21 Aug 2024
Published online: 12 Nov 2024 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article