Abstract
In improvement of the thermal performance there is necessity of the heat transfer augmentation. Heat transfer enhancement can be achieved with enlarged or extended surface, impeded boundary level, augmentation in the turbulence etc. It is desired to keep the size of heat exchanger compact for better working conditions. In the proposed work, we made the Computational Fluid Dynamics (CFD) analysis of the non-conventional type of ribs. In this work the non-conventional Stepped grooved shoe shaped ribs were studied by changing its geometry parameters like rib height (15, 20,22mm), thickness of the rib (4, 5,10 mm), and the ratio between these entities. The numerical analysis was done to study change in rate of heat transfer and pressure drop. The effects of variation in staggered arrangements and truncation gap on thermal performance were also studied. It was observed that providing staggered arrangement with truncation gap of 20 mm gives the optimum value of thermal enhancement factor of 1.33.
Highlights
A days it very important to augment the heat transfer as it applies to heavy industries to electronic components
The cross section of experimental air domain is maintained with rectangular shape of dimensions of 180mm×290mm and the length of it is 2.7 m. In this stepped shoe shape rib mounted plate is placed for the analysis of heat transfer enhancement
Effect of Truncation gap variation on Thermal Enhancement factor The thermal enhancement factor includes the effect of friction factor
Summary
A days it very important to augment the heat transfer as it applies to heavy industries to electronic components. The pitch to height ratio is confirmed to 10, width of the rib to hydraulic diameter 0.047 This shoe shape is augmented the heat transfer at the same pressure drop comparing with the square cross section rib. Where the optimum performance index is found at the 1.91 with the reference plate.S. Alfarawi et al, [7] detremined heat transfer and flow friction for a fully developed turbulent flow in a rectangular duct with its bottom wall ribbed with three different rib geometries such as semi-circular, rectangular and hybrid ribs of the two. Nianben Zheng, et al, [9] studied the heat transfer and friction loss performances of rib-roughened rectangular cooling channels having a variety of cross-sectional rib shapes were analyzed using three-dimensional Reynolds-averaged Navier– Stokes equations. Attempt is made in order to optimize the best thermal performance in case of the new stepped shoe shaped ribs
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