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Experimental results on local heat transfer coefficient inside a rectangular channel with chevron-shaped ribs

By Pasqualino Gramazio, Luigi Vitali, Damiano Fustinoni, Federica Vignati and Alfonso Niro

Abstract

A non-intrusive measurement technique of the heat transfer coefficient field, based on IR-thermography, is applied on a 12-mm-height rectangular channel of 1:10 aspect ratio, whose lower surface is enhanced by chevron-shaped square-cross-section ribs. The channel is operated at imposed heat flux while forced-air flows for Reynolds numbers ranging from 700 to 8000. In particular, the technique uses local temperature measurements to retrieve the radiative heat flux with a three-wavelength-band model for partially transparent enclosures, and the conductive flux towards the backside with a FEM model, which allow an edge-to-edge estimation of the local convective heat transfer. The resulting local Nusselt number maps are presented and compared to data obtained operating both at fixed temperature and inside a channel with flat surfaces

Publisher: 'IOP Publishing'
Year: 2018
DOI identifier: 10.1088/1742-6596/1224/1/012048
OAI identifier: oai:re.public.polimi.it:11311/1085310
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