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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Analysis of heat transfer and fluid flow of a slot jet impinging on a confined concave surface with various curvature and small jet to target spacing
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Analysis of heat transfer and fluid flow of a slot jet impinging on a confined concave surface with various curvature and small jet to target spacing

机译：狭缝射流撞击小曲率和小射流到目标间距的受限凹面的传热和流体流动分析

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Purpose This study aims to focus on the surface curvature, jet to target spacing and jet Reynolds number effects on the heat transfer and fluid flow characteristics of a slot jet impinging on a confined concave target surface at constant jet to target spacing. Design/methodology/approach Numerical simulations are used in this research. Jet to target spacing, H/B is varying from 1.0 to 2.2, B is the slot width. The jet Reynolds number, Rej, varies from 8,000 to 40,000, and the surface curvature, R2/B, varies from 4 to 20. Results of the target surface heat transfer, flow parameters and fluid flow in the concave channel are performed. Findings It is found that an obvious backflow occurs near the upper wall. Both the local and averaged Nusselt numbers considered in the defined region respond positively to the Rej. The surface curvature plays a positive role in increasing the averaged Nusselt number for smaller surface curvature (4-15) but affects little as the surface curvature is large enough (> 15). The thermal performance is larger for smaller surface curvature and changes little as the surface curvature is larger than 15. The jet to target spacing shows a negative effect in heat transfer enhancement and thermal performance. Originality/value The surface curvature effects are conducted by verifying the concave surface with constant jet size. The flow characteristics are first obtained for the confined impingement cases. Then confined and unconfined slot jet impingements are compared. An ineffective point for surface curvature effects on heat transfer and thermal performance is obtained.
机译：目的这项研究的重点是表面曲率，射流到目标的间距以及射流雷诺数对以恒定射流到目标间距撞击狭小凹形目标表面的狭缝射流的传热和流体流动特性的影响。设计/方法/方法在本研究中使用了数值模拟。射流到目标的距离，H / B在1.0到2.2之间变化，B是插槽宽度。射流雷诺数Rej从8,000到40,000不等，表面曲率R2 / B从4到20不等。执行目标表面热传递，流量参数和凹道中流体流动的结果。结果发现在上壁附近发生明显的回流。在定义区域中考虑的本地和平均努塞尔数均对Rej产生积极的响应。对于较小的表面曲率（4-15），表面曲率在增加平均Nusselt数方面起积极作用，但由于表面曲率足够大（> 15），影响很小。对于较小的表面曲率，热性能较大，而在表面曲率大于15时，热性能几乎不变。射流到目标的间距对传热增强和热性能产生负面影响。创意/值通过验证具有恒定射流大小的凹面来进行表面曲率效应。首先针对受限的冲击情况获得流动特性。然后比较受限和无限制的狭缝射流冲击。获得了表面曲率对传热和热性能的影响的无效点。

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