The present investigation has been carried out to investigate the steady-state forced convection heat transfer and pressure drop characteristics of turbulent flow in an air cooled horizontal duct. The aspect ratio (W/H, where W is width and H is the height of the duct) is varied in the range of 1 to 4. Square ribs are fixed on the inner side of the bottom wall which is heated with constant heat flux. Numerical simulation is carried out by adopting the k-ε turbulence model. The rib pitch-to-rib height ratio (p/e where p is the pitch and e is rib height) used is 10. The rib to height ratio (e/D, where D is the hydraulic diameter of the duct) on account of the varying aspect ratio is in the range of 0.05 to 0.125. The Reynolds Number is varied from 3,000 to 30,000. It is observed that the overall heat transfer coefficient increases with the increase in the duct aspect ratio. The highest heat transfer enhancement, accompanied by the highest friction factor occurs at an aspect ratio equal to 4.
|Number of pages||15|
|Journal||Recent Trends in Fluid Mechanics|
|Publication status||Published - 2016|