The effect of velocity ratio on thermal-hydraulic performance of reciprocating scraped surface heat exchangers at low Reynolds number
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AuthorSolano Fernández, Juan Pedro; García Pinar, Alberto; Vicente Quiles, Pedro Ginés; Viedma Robles, Antonio
Knowledge AreaMecánica de Fluidos
SponsorsThis research has been partially financed by the DPI2007-66551-C02-01 grant of the ''Dirección General de Investigación del Ministerio de Educación y Ciencia de España'' and the “HRS Spiratube” company.
Bibliographic CitationSOLANO, J.P. & GARCÍA, A. & VICENTE, P.G. & VIEDMA, A. (2009). The effect of velocity ratio on thermal-hydraulic performance of reciprocating scraped surface heat exchangers at low Reynolds number”. En: ExHFT-7, 7th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Cracovia, Polonia, 28 Jun – 3 Julio, 2009.
KeywordsHeat transfer enhancement
The thermal-hydraulic performance of a reciprocating scraper inserted in a round tube at low Reynolds number is studied. Pressure drop and heat transfer characteristics have been experimentally determined in static conditions in laminar regime (Reh=30), and results are contrasted with dynamic performance at several velocity ratios (ω=0.1 - 1). Maximum increases of Fanning friction factor of the order of 1.2 have been found, together with increases in Nusselt number of the order of 2, using propylene-glycol as working fluid.