numerical investigation on the convective heat transfer in a spiral coil with radiant heating
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ID: 215405
2016
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Abstract
The objective of this study was to numerically investigate the heat transfer
in spiral coil tube in the laminar, transitional, and turbulent flow regimes.
The Archimedean spiral coil was exposed to radiant heating and should
represent heat absorber of parabolic dish solar concentrator. Specific
boundary conditions represent the uniqueness of this study, since the heat
flux upon the tube external surfaces varies not only in the circumferential
direction, but also in the axial direction. The curvature ratio of spiral
coil varies from 0.029 at the flow inlet to 0.234 at the flow outlet, while
the heat transfer fluid is water. The 3-D steady-state transport equations
were solved using the Reynolds stress turbulence model. Results showed that
secondary flows strongly affect the flow and that the heat transfer is
strongly asymmetric, with higher values near the outer wall of spiral.
Although overall turbulence levels were lower than in a straight pipe, heat
transfer rates were larger due to the curvature-induced modifications of the
mean flow and temperature fields. [Projekat Ministarstva nauke Republike
Srbije, br. 42006]
| Reference Key |
lj.2016thermalnumerical
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|---|---|
| Authors | ;Đorđević Milan Lj.;Stefanović Velimir P.;Vukić Mića V.;Mančić Marko V. |
| Journal | Nature |
| Year | 2016 |
| DOI |
10.2298/TSCI16S5215D
|
| URL | |
| Keywords |
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