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首页> 外文期刊>International Journal of Heat and Mass Transfer >The Nukiyama curve in water spray cooling: Its derivation from temperature-time histories and its dependence on the quantities that characterize drop impact
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The Nukiyama curve in water spray cooling: Its derivation from temperature-time histories and its dependence on the quantities that characterize drop impact

机译：喷水冷却中的Nukiyama曲线：其源自温度-时间历史及其对表征液滴冲击的量的依赖

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摘要

Heat transfer from hot aluminium walls to cold water sprays was investigated. The method used was the transient two-side symmetric cooling of a planar aluminium target, previously heated to temperatures of up to 750 K, by twin sprays issuing from full-cone swirl spray nozzles of various gauge. The target's mid-plane temperature was recorded during the cooling transient by thin-foil K. thermocouples and a high-frequency data acquisition system. In order to determine the wall temperature T_w, the wall heat flux q_w". and the q_w" - T_w heat transfer (Nukiyama) curve, two different approaches were used: the first was based on the solution of an inverse heat conduction problem, the second on a suitable parameterization of the Nukiyama curve and on the solution of a minimum problem. Relevant heat transfer quantities, such as the critical heat flux and the single-phase heat transfer coefficient, were obtained from each heat transfer curve. Their dependence on the main parameters characterizing the spray impact phenomenon (mass flow rate, drop velocity and drop diameter) was investigated on the basis of a preliminary hydrodynamic characterization study, and suitable correlations were proposed.
机译：研究了从热铝壁到冷水喷雾的热传递。所使用的方法是对平面铝靶材进行短暂的两侧对称冷却，该靶材先前已通过从各种规格的全锥旋流喷嘴中喷出的双喷被加热到高达750 K的温度。在冷却瞬态期间，通过薄箔K.热电偶和高频数据采集系统记录了目标的中平面温度。为了确定壁温T_w，壁热通量q_w“。和q_w”-T_w传热（Nukiyama）曲线，使用了两种不同的方法：第一种是基于逆热传导问题的解，其次是对Nukiyama曲线进行适当的参数化，以及解决最小问题。从每条热传递曲线获得相关的热传递量，例如临界热通量和单相热传递系数。在初步的水动力特性研究的基础上，研究了它们对表征喷雾冲击现象的主要参数（质量流量，液滴速度和液滴直径）的依赖性，并提出了适当的相关性。

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