层流
努塞尔数
湍流
机械
半径
普朗特数
传热
停滞点
喷射(流体)
雷诺数
热力学
材料科学
物理
计算机安全
计算机科学
作者
X. Liu,John H. Lienhard,James S. Lombara
出处
期刊:Journal of heat transfer
[ASME International]
日期:1991-08-01
卷期号:113 (3): 571-582
被引量:194
摘要
The impingement of circular, liquid jets provides a convenient method of cooling surfaces. Here, jet impingement cooling of uniformly heated surfaces is investigated analytically and experimentally for stable, unsubmerged, uniform velocity laminar jets in the absence of phase change. Analytical and numerical predictions are developed for a laminar radial film flow. Experiments using undisturbed laminar jets were performed to determine local Nusselt numbers from the stagnation point to radii of up to 40 diameters. Turbulent transition in the film flow is observed experimentally at a certain radius. Beyond this transition radius, a separate turbulent analysis is constructed. Integral method results are compared to numerical results, and Prandtl number effects are investigated. The predictions are found to agree well with the measurements for both laminar and turbulent flow. Predictive formulae are recommended for the entire range of radii.
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