RT Journal Article
T1 Experimental determination of the convection heat transfer coefficient in an eccentric annular duct
A1 Serrano García, Daniel
A1 Sánchez Delgado, Sergio
A1 Pérez Álvarez, Rafael
A1 Acosta Iborra, Antonio
AB The use of bayonet tube heat exchangers and heaters is widespread in many industrial applications and an improvement in the heat transfer coefficient may provide benefits over other technologies. This work presents novel experimental results about the turbulent convection heat transfer coefficient of air in the annular section of a bayonet tube for two different configurations: concentric and eccentric tubes. For both configurations, the convection heat transfer coefficient was obtained at different air flow rates, therefore, at different Reynolds numbers. In the case of the eccentric configuration, the angular position of the inner tube was varied to determine the circumferential distribution of the local convective heat transfer coefficient. An increase of the convection coefficient was observed for both configurations at higher Reynolds numbers. Concerning the angular position with regard the inner tube, the largest local convective heat transfer coefficient was obtained at the angular position where the distance between the inner and outer tubes was maximum, yielding a value 22.3% higher than in the case of a concentric annular section. All these experimental results were used to propose a new correlation for the local convective heat transfer coefficient as a function of the Prandtl and Reynolds numbers, the eccentricity, and the angular position of the inner tube, with a maximum discrepancy between correlation and experimental data below 10%.
PB Elsevier
SN 0894-1777
YR 2022
FD 2022-08-01
LK https://hdl.handle.net/10016/38483
UL https://hdl.handle.net/10016/38483
LA eng
NO The authors gratefully acknowledge the financial support provided by Spanish Government through the project RTI2018-096664-B-C21 (FEDER/Ministerio de Ciencia e Innovación-Agencia Estatal de Investigación). Funding for APC: Universidad Carlos III de Madrid (Read & Publish Agreement CRUE-CSIC 2022)
DS e-Archivo
RD 18 jul. 2024