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Effect of the axial scraping velocity on enhanced heat exchangers

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Identifiers
URI: http://hdl.handle.net/10317/5478
ISSN: 0142-727X
DOI: DOI: 10.1016/j.ijheatfluidflow.2013.06.009
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Author
Martínez, Pedro; Vicente, Pedro; Viedma Robles, Antonio; Crespí Llorens, Damián
Research Group
Mecánica de Fluidos e Ingeniería Térmica
Knowledge Area
Mecánica de Fluidos
Publication date
2013
Bibliographic Citation
Crespí-Llorens D Martínez P Vicente P Viedma A. (2013). Effect of the axial scraping velocity on enhanced heat exchangers. En International Journal of Heat and Fluid Flow, vol: 44 pp: 265-275.
Peer review
SI
Keywords
Heat transfer enhancement
Visualization study
Turbulence level,
Numerical simulation
Insert device
Abstract
The flow pattern within an enhanced tubular heat exchanger equipped with a reciprocating scraping device is experimentally analysed. The insert device, specially designed to avoid fouling and to enhance heat transfer, has also been used to produce ice slurry. It consists of several circular perforated scraping discs mounted on a coaxial shaft. The whole is moved alternatively along the axial direction by a hydraulic cylinder. The phase-averaged velocity fields of the turbulent flow have been obtained with PIV technique for both scraping semi-cycles. Special attention has been paid to the effect of the non-dimensional scraping velocity and the Reynolds number in the flow field. CFD simulations provide support for the identification of the flow patterns and the parameter assessment extension. The results show how the scraping parameters affect the turbulence level produced in the flow and therefore the desired heat transfer enhancement.
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