A REVIEW ON DIFFERENT TECHNIQUES USED FOR IMPROVEMENT HEAT TRANSFER IN SQUARE DUCT

Abstract

The improvement of heat transfer along square ducts is essential for optimum thermal management in a variety of mechanical applications. The present review investigates the impact of using baffles, ribs, and tapes to increase heat transfer efficiency in square ducts and the design parameter which also play critical role to improve heat transfer such as inclination angle, blockage ratio, pitch ratio, Etc. Ribs, tapes and baffles all of them placed in different arrangements such as in-line, staggered and systematic arrangement with various technique used like adding perforation, gaps, wavy surface. This review utilizes both of experimental and numerical methods to evaluate the performance of each technique, either alone or in a combination. Empirical examination includes different rib configurations, baffle placements, and tape types. The findings reveal that gaps and holes enhance heat transfer and design parameters like attack angle has various of optimal values depended on type of obstructive where it estimates in baffles a value to 90° while in tapes and ribs are equal to 45°.