Flow and Heat Transfer of Impinging Jet with Low Nozzle-Plate Spacing and Their Control (Effects of Nozzle Wall Thickness and Geometry)

敏彦, 社河内; 秀樹, 杉本; 俊剛, 安藤; 公一, 辻本; 剛, 田辺

doi:10.1299/kikaib.69.2305

Cited by 2 publications

(2 citation statements)

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“…T w solid = T wgas , and K w solid ∂T w solid ∂x = K wgas ∂T wgas ∂x (12) No thermal radiation loss from the solid surface is assumed. This is due to the temperature difference within the surface region of the cavity wall.…”

Section: Solid-fluid Interfacementioning

confidence: 99%

“…They showed that the usual method of representing the Nusselt number as a function of Reynolds number was inadequate in the compressible flows where the nozzle Mach number or pressure ratio ought to be included. The flow and heat transfer characteristics during the jet impingement onto a closely spaced plate were examined by Shakouchi et al [12]. They indicated that the heat transfer characteristics could be considerably improved.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Jet emerging from an annular nozzle and impinging onto cylindrical cavity: Effect of jet velocity on flow structure and heat transfer rates

Shuja

Yilbaş

Khan

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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In laser gas assisting processes, nozzles are used to accelerate the impinging gas and attain a proper flow structure to improve the quality of the end product. In this study, the jet emerging from an annular nozzle and impinging onto a cylindrical cavity is considered. The effects of jet velocity at nozzle exit onto the flow structure in the region of the cavity and heat transfer rates from the cavity surface are examined. To resemble the laser-produced cavity, the cavity wall temperature is kept elevated (almost the melting temperature of the substrate material). Reynolds stress turbulence model is exploited to account for the turbulence. In the simulations, four jet velocities, two outer angles of the annular nozzle, and two depths of the cylindrical cavity are employed while air is used for the working fluid. It is found that jet velocity has a significant effect on the heat transfer rates and skin friction, which is more pronounced with increasing cavity depths.

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Section: Solid-fluid Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%