Optimal spray characteristics in water spray cooling
Optimal spray characteristics in water spray cooling
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DOI：
10.1016/j.ijheatmasstransfer.2004.05.033
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发表时间：
2004-11
影响因子：
5.2
通讯作者：
Ruey-Hung Chen;L. Chow;J. E. Navedo
中科院分区：
文献类型：
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作者：
Ruey-Hung Chen;L. Chow;J. E. Navedo
对过冷水喷雾冷却系统进行了实验研究，得到了CHF下液体利用率（η）与喷雾参数的关系。喷雾可以由三个独立的参数（液滴Sauter平均直径d32、液滴速度V和液滴通量N）表征。在这项研究中，这些参数中的每一个都是变化的，其他两个保持不变，通过使用喷嘴，操作压力，喷嘴出口和加热器表面之间的距离的组合。结果表明，当三个喷雾参数中的两个保持基本不变时，η分别随N−2/3、d32-14/5和V1/4变化。CHF随N_（1/6）和V_（1/4）的变化而变化，与d_（32）相对无关。得出的结论是，为了实现最大可能的CHF，同时使用最少量的水，它是可取的选择喷嘴，产生尽可能小的液滴直径与尽可能高的速度。
The dependence of the efficiency of liquid usage (η) at CHF on spray parameters was experimentally investigated for subcooled water spray cooling. A spray can be characterized by three independent parameters (droplet Sauter-mean diameter, d32, droplet velocity, V, and droplet flux, N). In this study, each of these parameters was varied with the other two kept constant by using a combination of spray nozzles, operating pressures, and distance between the nozzle exit and the heater surface. It was found that η varies with N−2/3, d32-14/5and V1/4, respectively, when two of the three spray parameters are kept nearly constant. It was also found that CHF varies with N1/6and V1/4and is relatively independent of d32. It is concluded that to achieve the maximum possible CHF while using the minimum quantity of water, it is desirable to select nozzles that produce as small a droplet diameter with as high a velocity as possible.