THE COMBINED EFFECT OF RIB WITH TANDEM LARGE EDDY BREAK UP DEVICES ON FLOW AND HEAT TRANSFER CHARACTERISTIC OF TURBULENT FLOW IN RECTANGULAR DUCT : PART B | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 17, Issue 1, March 2017, Pages 142-158 | ||
| Authors | ||
| Ali Falah Mohammed; Ekhlas Mohammed Fayyedh; Moayed R. Hasan | ||
| Abstract | ||
| An experimental investigation was carried out to study the effect of Large Eddy Breakup Devices with of circular ribs on one heated wall of a rectangular duct with fully developed turbulent flow , on heat transfer and flow characteristic. The artificially roughened duct has an aspect ratio (W/H) of 10, hydraulic diameter of 72.72 mm, relative roughness pitch (P/e) of 10 and relative roughness height (e/Dh) of 0.05. The experiments were conducted by varying airflow rate in terms of Reynolds number ranging from 3.2x104 to 6.2x104 and constant heat flux of 600 W/m2.The heat transfer and friction characteristics of the duct were compared with those of a smooth duct under similar experimental conditions. It was found that there was a significant enhancement of Nusselt number for combined high Reynolds number (2.6) and friction factor (3.47). | ||
| Keywords | ||
| Drag reduction; turbulence manipulation; large; eddy break; up devices | ||
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