%0 Journal Article 
%A Solano Fernández, Juan Pedro
%A García Pinar, Alberto
%A Vicente Quiles, Pedro Ginés
%A Viedma Robles, Antonio
%T Flow Pattern Assessment in Tubes of Reciprocating Scraped Surface Heat Exchangers
%D 2011
%@ 1290-0729
%U http://hdl.handle.net/10317/4471
%X 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 semi-cycle.
%K Mecánica de Fluidos
%K Scraped surface heat exchanger
%K SSH
%K Particle image  velocimetry
%K PIV
%K Flow pattern
%K CFD
%~ GOEDOC, SUB GOETTINGEN