TY - JOUR
TI - Radiant absorption characteristics of corrugated curved tubes
AU - Đorđević Milan Lj
AU - Stefanović Velimir P
AU - Kalaba Dragan V
AU - Mančić Marko V
AU - Katinić Marko D
JN - Thermal Science
PY - 2017
VL - 21
IS - 6
SP - 2897
EP - 2906
PT - Article
AB -  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]