Flow Pattern Assessment in Tubes of Reciprocating Scraped Surface Heat Exchangers
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AuthorSolano Fernández, Juan Pedro; García Pinar, Alberto; Vicente Quiles, Pedro Ginés; Viedma Robles, Antonio
Research GroupMecánica de Fluidos e Ingeniería Térmica
Knowledge AreaMecánica de Fluidos
SponsorsThis 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 computations
Bibliographic CitationInternational Journal of Thermal Sciences. Volume 50, Issue 5, May 2011, Pages 803-815.
KeywordsScraped surface heat exchanger
Particle image velocimetry
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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