Experimental investigation of turbulence level in enhanced heat exchangers with active insert devices
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AuthorCrespí Llorens, Damián; Vicente Quiles, Pedro Ginés; Solano Fernández, Juan Pedro; García Pinar, Alberto; Viedma Robles, Antonio
Knowledge AreaMecánica de Fluidos
Bibliographic CitationCRESPI, D. & VICENTE, P.G & SOLANO, J.P. & GARCÍA, A. VIEDMA, A. (2009). “Experimental investigation of turbulence level in enhanced heat exchangers with active insert devices” En: Heat Exchanger Fouling and Cleaning VIII, Pichl/Schladming, Austria, June 14 -19, 2009.
Particle Image Velocimetry (PIV)
Heat transfer augmentation
This work presents a visualization study carried-out on a dynamic insert device. The flow pattern is obtained by employing the Particle Image Velocimetry (PIV) technique. The insert device is moved alternatively along a tube and consists of several circular elements with six circumferentially distributed holes on them, which are mounted on a shaft with a pitch of 5D. The whole is moved alternatively along the axial direction by a hydraulic cylinder. The increase of the turbulence level of the Flow will be analyzed and related to the heat transfer augmentation. By the use of Particle Image Velocimetry technique and water as test fluid, the 2-Dimensional pattern of the turbulent flow is obtained on the two symmetry planes of the device: hole center and between holes. The results permit to establish the flow pattern along the devices. In static conditions of the scraper, experiments are carried out at three different Reynolds ranging from 4000 to 6323. In dynamic conditions, the Reynolds ...