AIR FLOW CHARACTERISTICS OF STAGGERED WING-SHAPED TUBE BUNDLE AT DIFFERENT ANGLES OF ATTACK

Sayed Ahmed E. Sayed, Emad Z. Ibrahiem, Osama M. Mesalhy, Mohamed A. Abdulatief

Abstract


An experimental and numerical study has been conducted to clarify fluid flow characteristics and pressure drop distributions of a cross-flow heat exchanger employing staggered wing-shaped tubes at different angles of attack. The water-side Rew and the air-side Rea were at 5 x 102 and at from 1.8 x 103 to 9.7 x 103, respectively. Three cases of the tubes arrangements with various angles of attack, row angles of attack and 90° cone angles were employed at the considered Rea range. Correlation of pressure drop coefficient Pdc in terms of Rea, design parameters for the studied cases were presented. The flow pattern around the staggered wing-shaped tubes bundle were predicted using the commercial CFD FLUENT 6.3.26 software package. Results indicated that the values of Pdc increased with the angle of attack from 0° to 45°, while the opposite was true for angles of attack from 135° to 180°. Comparisons between the experimental and numerical results of the present study and those obtained by similar previous studies showed good agreements

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