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Journal of Engineering and Applied Sciences

ISSN: Online 1818-7803
ISSN: Print 1816-949x
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Mixed Convection Heat Transfer in an Absorber Tube with Non‐Uniform Heat Flux Distributions boundary for a Linear Fresnel Solar Thermal Collector: Review Work

Izuchukwu F. Okafor and Bappah Adamu Umar
Page: 103-109 | Received 10 May 2022, Accepted 15 Nov 2022, Published online: 29 Dec 2022

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https://doi.org/10.36478/10.59218\makjeas.2022.103.109

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Abstract

This study reviewed the mixed convective heat transfer in absorber tubes similar to that of a linear Fresnel solar collector. Studies on the experimental and numerical simulations of linear Fresnel solar thermal collectors were reviewed to establish the gaps in the literature for further studies that could improve the overall performance of a linear Fresnel solar collector. The solar heat flux impinges on the absorber tubes of a linear Fresnel solar collector, from underneath independent of the position of the sun. This resulted in a circumferential non‐uniform heat flux distributions around the tube wall, contrary to previous studies which assumed uniform heat flux boundaries for convenience. A number of studies had investigated mixed convection heat transfer in horizontal circular tubes for uniform heat flux distribution boundary symmetrical to the direction of the gravitational field. Studies are lacking for linear Fresnel solar collectors due to non‐uniform circumferential heating of the absorber tubes from underneath for weak turbulent or laminar flow conditions. Studies are also lacking in the literature for the case of asymmetrical non‐uniform heat flux distributions boundary on the absorber tube when the incident solar radiation deviated from the zenith angle position due to the sun tracking system of the collector. The degree of asymmetry of the heat flux distribution boundary could have a significant influence on the internal heat transfer characteristics of the
absorber tubes.

How to cite this article:

Izuchukwu F. Okafor and Bappah Adamu Umar. Mixed Convection Heat Transfer in an Absorber Tube with Non‐Uniform Heat Flux Distributions boundary for a Linear Fresnel Solar Thermal Collector: Review Work.
DOI: https://doi.org/10.36478/10.59218\makjeas.2022.103.109
URL: https://www.makhillpublications.co/view-article/1816-949x/10.59218\makjeas.2022.103.109