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Experimental study of pressure drop reduction on in-line tube bundle using passive control
Published online by Cambridge University Press: 22 August 2013
Abstract
In the present paper an experimental investigation of drag reduction on in-line tube bundles with a configuration of seven by seven with a pitch ratio of 1.44 has been performed. Two longitudinal grooves are placed on the external surface of the circular cylinders as a passive control. The experiment is carried out using a subsonic wind tunnel. The pressure distributions for various azimuthal angles along the tubes are measured using a multi-channel differential pressure. Drag forces are also determined using a combined wire-strain gauge balance. The pressure drops are deduced from the resulting drag forces. The results obtained show an unexpected reduction in the pressure drop for the tube bundles. A reduction of 36.5% in the pressure drop for a Reynolds number of 1.33 × 104 is found compared to the configuration without grooves. Some correlations for the pressure drop are proposed.
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- © AFM, EDP Sciences 2013
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