Experimental correlations on critical Reynolds numbers and friction factor in tubes with wire-coil inserts in laminar, transitional and low turbulent flow regimes
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The authors gratefully acknowledge the “Fundación Séneca” (Fundación Séneca: Project with Ref. 15297/PI/10) and the Spanish Ministry of Science (Project with Ref. ENE2011-28571-C02-01) for supporting this research.Fecha de publicación
2018-02Editorial
ElsevierCita bibliográfica
J. Pérez-García, A. García, R. Herrero-Martín, J.P. Solano, Experimental correlations on critical Reynolds numbers and friction factor in tubes with wire-coil inserts in laminar, transitional and low turbulent flow regimes, Experimental Thermal and Fluid Science, Volume 91, 2018, Pages 64-79, ISSN 0894-1777, https://doi.org/10.1016/j.expthermflusci.2017.10.003Revisión por pares
siPalabras clave
Wire-coil-insertsFriction factor correlations
Critical Reynolds numbers
Transition flow
Laminar flow
Low turbulent flow
Resumen
This paper analyses 23 circular helicoidal wire-coils with different geometric characteristics ranging from: dimensionless pitch p/d = [0.25–3.37], dimensionless thickness e/d = [0.071–0.286] and a Reynolds number interval from 50 to 8000. This interval widely includes the Reynolds number range in which rigid wire-coil inserts present better performance as passive enhancement technique for tubular heat exchanger applications Re = [200–2000]. Based on their hydraulic performance, the wire-coil inserts are categorized according to a new dimensionless parameter: the Transition Shape Parameter (TSP). A new set of correlations are obtained to predict the Fanning friction factor coefficient as a function of Reynolds number and geometrical characteristics of the insert within the three flow regimes: laminar, transitional and low turbulent. Additional correlations are proposed to estimate the critical Reynolds number at the beginning and ending of the transition region, which allows to select ...
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