Effects of Arc-Shaped Partitions in Corners of a Shallow Cavity on Natural Convection

Year 2019, , 17 - 23, 28.03.2019

Mert Gurturk Hakan Fehmi Oztop Fatih Selimefendigil Khaled Al-salem

https://doi.org/10.17350/HJSE19030000128

Cited By: 1

Abstract

I n this study, a numerical analysis carried out to determine the effects of arc-shaped partitions in corners of a shallow cavity on heat transfer which is natural convection and fluid flow. Partitions are accepted as conductive and two different partitions materials are chosen as wood and aluminum. The finite volume approach is used to discretize the governing equations for Rayleigh numbers Ra and shape ratio of the arc-shaped partition. It is found that arc-shaped partitions have effect on characteristic parameters of fluid flow and heat transfer. Specially, aluminum arc-shaped partition affects the average heat transfer enhancement, because it has high heat transfer coefficient. Also, possibilities of occurring dead regions are examined and streamlines obtained for without partitions and high Rayleigh numbers which are Ra=105 and Ra=106 show that dead regions occur in corners of the shallow cavity. Results obtained from the analysis using partitions and considering different Rayleigh numbers and partition materials show that using partition which is arcshaped prevent occurring dead regions

Keywords

Natural convection, Conjugate heat transfer, Heat transfer, Shallow cavity, Arc-shaped

References

• 1. Polat O, Bilgen E. Conjugate heat transfer in inclined open shallow cavities. International Journal of Heat Mass Transfer 46 (2003) 1563-1573.
• 2. Shiralkar GS, Tien CL. A numerical study of laminar natural convection in shallow cavities. Transactions of ASME 103 (1981) 226-231.
• 3. Drummond JE, Korpela SA. Natural convection in a shallow cavity. Journal Fluid Mechanic 182 (1987) 543-564.
• 4. Paolucci S, Chenoweth DR. Natural convection in shallow enclosures with differentially heated endwalls. Transactions of ASME 110 (1988) 625-634.
• 5. Zhang Z, Bejan A, Lage JL. Natural convection in a vertical enclosure with internal permeable screen. Transactions of ASME 113 (1991) 377-383.
• 6. Novak MH, Nowak ES. Natural convection heat transfer in slender window cavities. Transactions of ASME 115 (1993) 476-479.
• 7. Bhave P, Narasimhan A, Rees DAS. Natural convection heat transfer enchancement using adiabatic block: Optimal block size and Prandtl number effect. International Journal of Heat and Mass Transfer 49 (2006) 3807-3818.
• 8. Karatas H, Derbentli T. Natural convection and radiation in rectangular cavities with one active vertical wall. International Journal of Thermal Sciences 123 (2018) 129-139.
• 9. Benos LTh, Kakarantzas SC, Sarris IE, Grecos AP, Vlachos NS. Analytical and numerical study of MHD natural convection in a horizontal shallow cavity with heat generation. International Journal of Heat and Mass Transfer 75 (2014) 19–30.
• 10. Alloui Z, Vasseur P. Natural convection in a shallow cavity filled with a micropolar fluid. International Journal of Heat and Mass Transfer 53 (2010) 2750–2759.
• 11. Alloui Z, Vasseur P, Reggio M. Natural convection of nanofluids in a shallow cavity heated from below. International Journal of Thermal Sciences 50 (2011) 385-393.
• 12. Patankar SV. Numerical Heat Transfer and Fluid Flow, Hemisphere, NewYork, 1980.
• 13. Hayase J, Humphrey AC, Greif AR. A Consistently formulated QUICK scheme for fast and stable convergence using finite-volume ıterative calculation procedures. Journal of Computational Physics 98 (1992) 108-118.
• 14. Fluent, 12.0 User Guide. 2009.
• 15. Barakos G, Mitsoulis E, Assimacopoulos D. Natural convection flow in a square cavity revisited: laminar and turbulent models with wall functions. International Journal for Numerical Methods in Fluids 18 (1994) 695-719.
• 16. Wan DC, Patnaik BSV, Wei GW. A new benchmark quality solution for the buoyancy-driven cavity by discrete singular convolution. Numerical Heat Transfer, Part B: Fundamentals 40 (2001) 199-228.