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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

RELATIONSHIP BETWEEN PRESSURE DROP AND HEAT TRANSFER IN SMOOTH HORIZONTAL TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC16.cov.023022
pages 2883-2890

Sinopsis

Although pressure drop and heat transfer measurements are usually taken simultaneously, limited work has been done specifically focusing on the relationship between pressure drop and heat transfer, especially in the transitional flow regime. The purpose of this study was therefore to experimentally investigate and compare the pressure drop and heat transfer characteristics, as well as the flow regime boundaries, of developing and fully developed flow in a smooth horizontal tube heated at a constant heat flux. An experimental set-up was designed, built and validated against correlations from literature. Pressure drop and heat transfer measurements were taken simultaneously in a test section with an inner diameter and length of 11.5 mm and 9.5 m respectively, at heat fluxes of 1 kW/m2 and 3 kW/m2. Experiments were conducted using water between Reynolds numbers of 1 000 and 10 000 and the Prandtl number ranged between 3 and 7. It was found that the flow regime boundaries were the same for the pressure drop and heat transfer results. In the laminar flow regime, the relationship between pressure drop and heat transfer was found to be a strong function of Grashof number, while it was a strong function of Reynolds number in the other flow regimes. Furthermore, by using this relationship between pressure drop and heat transfer, correlations were developed to determine the friction factors as a function of Nusselt number for mixed convection developing and fully developed flow in all flow regimes.