THERMAL SCIENCE

International Scientific Journal

Chemseddine Maatki

,

Mohammed A. Almeshaal

,

Lioua Kolsi

HEAT TRANSFER ENHANCEMENT IN AN INCLINED SOLAR COLLECTOR USING PARTIALLY DRIVEN COLD WALL AND CARBON NANOTUBES BASED NANOFLUID

ABSTRACT
In order to improve the performance of a solar collector in low heat transfer rate zones, a 3-D numerical study of the effects of partially moving wall sections and the use of a water nanofluid (CNT) in a tilted parallelepiped solar collector was performed. Equations governing the mixed convection phenomena occurring in the cavity are developed based on the 3-D potential-vorticity formulation and solved using the finite volume method. Two cases related to the direction of the moving surfaces are considered and compared to the base case (no driven walls). The results are presented in term of flow structures, temperature fields and local and average Nusselt numbers. The Richardson number is varied from 0.001 to 10 and the CNT volume fraction from 0 to 0.045. The results showed that for low Richardson values (less than 1), the motion direction of the moving surfaces has no significant effect on heat transfer rates and becomes effective for higher values. The highest rates of heat transfer are found for high Richardson values and CNT volume fractions, while the enhancement ratio (compared to the base case) occurs for low Richardson values.
KEYWORDS
Heat Transfer Enhancement, partially driven surfaces, nanofluids, 3D Numerical analysis, solar collector
PAPER SUBMITTED: 2022-05-20
PAPER REVISED: 2022-08-14
PAPER ACCEPTED: 2022-08-25
PUBLISHED ONLINE: 2022-09-25
DOI REFERENCE: https://doi.org/10.2298/TSCI220520144M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 6, PAGES [5081 - 5094]
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Heat transfer enhancement in an inclined solar collector using partially driven cold wall and carbon nanotubes based nanofluid

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence