Flow Pattern Assessment in Tubes of Reciprocating Scraped Surface Heat Exchangers
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Solano Fernández, Juan Pedro; García Pinar, Alberto; Vicente Quiles, Pedro Ginés; Viedma Robles, AntonioGrupo de investigación
Mecánica de Fluidos e Ingeniería TérmicaÁrea de conocimiento
Mecánica de FluidosPatrocinadores
This research has been partially financed by the DPI2007- 66551-C02 grant of the Spanish Ministery of Science and the company ”HRS Spiratube”. The authors are grateful to SEDIC-SAIT (UPCT) for providing the technical resources for CFD computationsFecha de publicación
2011-05Editorial
ElsevierCita bibliográfica
International Journal of Thermal Sciences. Volume 50, Issue 5, May 2011, Pages 803-815.Revisión por pares
SIPalabras clave
Scraped surface heat exchangerSSH
Particle image velocimetry
PIV
Flow pattern
CFD
Resumen
Flow pattern in the tubes of an innovative scraped surface heat exchanger with
reciprocating scrapers has been experimentally investigated. The scraper consists of a concentric rod inserted in each tube of the heat exchanger, mounting an array of semicircular plugs that fit the inner tube wall. A hydraulic piston provides the scraper with constant-velocity reciprocating motion. Phase-averaged velocity fields have been obtained with PIV technique for both scraping semi-cycles, with special emphasis on the effect of the scraping velocity (velocity ratio) and Reynolds number.
Visualization results have been contrasted with experimental data on Fanning friction
factor, obtaining a clear relation between flow patterns, pressure drop augmentation
and turbulence promotion. CFD simulations for quasi-steady laminar flow provide a
further insight into the relation of the flow structures with wall shear stress, and the contribution of pressure forces to global head losses, for each scraping ...
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