Abstract
Flow and heat transfer characteristics of slot jets impingement to a cylindrical convex surface are numerically investigated. Suitable turbulence models have been determined through comparison with the experimental data. Flow structures are described and impingement heat transfer characteristics are discussed. The effects of Re, H/B and D/B on single-slot jets impingement heat transfer are analyzed and heat transfer characteristics of multiple-slot jets are investigated. The results show that: Gas flows along the convex surface and boundary layer separation occurs in both single and multiple-slot jets impingement. A maximum stagnation Nu appears at H/B=8 and the local Nu decreases with increasing H/B in the region far away from the stagnation. The Nu in the stagnation region decreases with increasing D/B but the Nu is nearly the same in the region far away from the stagnation. Pressure gradient is an important factor on heat transfer enhancement. Correlations of the Nu m for single-slot, double-slot and quadric-slot jets impinging on a convex surface are obtained. It indicates the effects of Re and D/B on Nu m could become more important in less slot jets impingement.
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C. Gau, C.M. Chung. Surface curvature effect on slot-air-jet impingement cooling flow and heat transfer process[J]. Journal of Heat Transfer, 1991, 113: 858–864
Geunyoung Yang, Mansoo Choi, Joon Sik Lee. An Experimental study of slot jet impingement cooling on concave surface: effects of nozzle configuration and curvature[ J]. International Journal of Heat and mass Transfer, 1999, 42: 2199–2209
F. Gori, I. Petracci, V. Tedesco. Cooling of two smooth cylinders in row by a slot jet of air with low turbulence[J]. Applied Thermal Engineering, 2007, 27: 2415–2425
F. Gori, L. Bossi. Optimal slot height in the jet cooling of a circular cylinder[J]. Applied Thermal Engineering, 2003, 23: 859–870
F. Gori, L. Bossi. On the cooling effect of an air jet along the surface of a cylinder[J]. International Communications in Heat and Mass Transfer, 2000, 27(5): 667–76
C.S. McDaniel, B.W. Webb. Slot jet impingement heat transfer from circular cylinders[J]. International Journal of Heat and Mass Transfer, 2000, 43: 1975–1985
T.L. Chan, C.W. Leung, K. Jambunathan, et al. Heat Transfer characteristics of a slot jet impinging on a semi-circular convex surface[J]. International Journal of Heat and Mass Transfer, 2002, 45: 993–1006
E.E.M. Olsson, L.M. Ahrne, A.C. Tragardh. Flow and heat transfer from multiple slot air jets impinging on circular cylinders[J]. Journal of Food Engineering, 2005, 67: 273–280
H. Martin. Heat and mass transfer between impinging gas jets and solid surfaces[J]. Advances in Heat Transfer, 1997, 13: 1–60
E.E.M. Olsson, L.M. Ahrne, A.C. Tragardh. Heat transfer from a slot air jet impinging on a circular cylinder[J]. Journal of Food Engineering, 2004, 63: 393–401
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Jiang, Z., Liu, C., Zhang, X. et al. Numerical simulation of flow and heat transfer from slot jets impinging on a cylindrical convex surface. J. Therm. Sci. 20, 460–466 (2011). https://doi.org/10.1007/s11630-011-0496-z
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DOI: https://doi.org/10.1007/s11630-011-0496-z