Abstract
Abstract In the present study the effects of ribbed and grooved walls of swirl cooling chamber on heat transfer and fluid flow characteristics are investigated. This study presents ten roughened wall shapes that are compared with a smooth wall in a swirl cooling chamber. The roughened wall shapes are circumferential and longitudinal with and without cut. The circumferential cases consist of four cases. The first case is called (CG) which has eight grooves along chamber surface. The second case is called (CGC) which has eight cut grooves along chamber surface. The third case (CR) and the fourth case (CRC) have eight ribs without and with cut along chamber surface. While the longitudinal cases, consist of six cases. The first four cases (LG, LGC, LR and LRC) have six longitudinal grooves and ribs without and with cut. The last two longitudinal cases (LRG and LRGC) have hybrid grooves and ribs without and with cut along chamber surface. The comparison is conducted by CFX software and the study parameters are bulk temperature, averaged circumferential heat transfer ratio, friction factor, global thermal performance factor and turbulence kinetic energy. The results show that heat transfer of cases LG, CG and CGC are enhanced by about 2.7, 2.6 and 2.5 higher than smooth case; respectively. The global thermal performance factor is increased by using rough walls in swirl cooling chamber, the global thermal performance factor of LG case reaches 2.8 times higher than that for smooth case. The maximum heat transfer characteristics can be achieved by a grooved wall of case LG compared with the other internal cooling techniques.
Published Version
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