THERMAL SCIENCE

International Scientific Journal

Milan Lj Đorđević

,

Velimir P. Stefanović

,

Dragan V. Kalaba

,

Marko V. Mančić

,

Marko D. Katinić

RADIANT ABSORPTION CHARACTERISTICS OF CORRUGATED CURVED TUBES

ABSTRACT
The utilization of modern paraboloidal concentrators for conversion of solar radiation into heat energy requires the development and implementation of compact and efficient heat absorbers. Accurate estimation of geometry influence on absorption characteristics of receiver tubes is an important step in this process. This paper deals with absorption characteristics of heat absorber made of spirally coiled tubes with transverse circular corrugations. Detailed 3-D surface-to-surface Hemicube method was applied to compare radiation performances of corrugated and smooth curved tubes. The numerical results were obtained by varying the tube curvature ratio and incident radiant heat flux intensity. The details of absorption efficiency of corrugated tubes and the effect of curvature on absorption properties for both corrugated and smooth tubes were presented. The results may have significance to further analysis of highly efficient heat absorbers exposed to concentrated radiant heating. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 42006]
KEYWORDS
heat absorbers, corrugated tubes, spiral coil, absorption efficiency
PAPER SUBMITTED: 2016-04-20
PAPER REVISED: 2016-10-28
PAPER ACCEPTED: 2016-10-31
PUBLISHED ONLINE: 2016-11-06
DOI REFERENCE: https://doi.org/10.2298/TSCI160420263D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 6, PAGES [2897 - 2906]
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Radiant absorption characteristics of corrugated curved tubes

© 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