Heat transfer enhancement of spray cooling in straight-grooved surfaces in the non-boiling regime
Heat transfer enhancement of spray cooling in straight-grooved surfaces in the non-boiling regime
复制标题
非沸腾状态下直槽表面喷雾冷却的强化传热
DOI：
10.1016/j.expthermflusci.2015.08.001
复制
发表时间：
2015-12
影响因子：
3.2
通讯作者：
Wang Zhaoliang
中科院分区：
文献类型：
--
作者：
Zhang Wei;Zhang Wei;Wang Zhaoliang;Wang Zhaoliang
采用压力雾化全锥喷嘴，对6个直槽表面和1个水平放置的平面进行了非沸腾工况下喷雾冷却实验，研究了表面结构参数和体积流量对喷雾冷却换热的影响。在实验中，表面温度设定为低于100 °C，并且喷嘴固定在表面上方1.0 cm处。结果表明，在体积热流密度为1.604 L/（m2 s）时，槽深为0.5 mm、槽宽为0.4 mm的表面具有最大的热流增强效果。当体积热流密度为12.73 L/（m2 s）时，最佳换热表面为槽深0.5 mm、槽宽0.2 mm的另一表面，在表面温度为80 °C时，其热流密度为202.5 W/cm 2，比平表面提高了61.6%。研究了直槽表面喷雾冷却的三种不同换热方式，即肋片顶面换热、槽壁换热和槽底换热。通过对液滴下落过程的受力分析，发现液滴在12.73 L/（m2 s）的体积流量下的剩余速度远大于1.604 L/（m2 s）的体积流量下的剩余速度，使得液滴在12.73 L/（m2 s）的体积流量下能够更好地冷却槽壁和槽底表面。这就是为什么最佳传热强化表面是不同的两个体积通量。推导出了一个传热模型，该模型可以准确地预测直槽表面的热流密度在12.73 L/（m2 s）以上。
Experiments were performed on six straight-grooved surfaces and one flat surface placed horizontally using pressure atomized full-cone nozzles to study the effects of structure parameters of surfaces and volumetric fluxes on heat transfer during water spray cooling in non-boiling regime. In the experiments, the surface temperature was set below 100 °C, and the nozzle was fixed 1.0 cm above surfaces. The results show that the surface with the groove depth of 0.5 mm and the groove width of 0.4 mm has the largest heat flux enhancement at the volumetric flux of 1.604 L/(m2s). While for the volumetric flux of 12.73 L/(m2s), the optimal heat transfer surface is another surface with the groove depth of 0.5 mm and the groove width of 0.2 mm, the heat flux of which is 202.5 W/cm2enhanced about 61.6% relative to the flat surface at the surface temperature of 80 °C. Three distinct heat transfers, which are heat transfer on top surface of fins, on sidewall of grooves and on bottom of grooves, are identified for spray cooling on straight-grooved surfaces. Based on the analysis of force acting on the falling droplet, it is found that the residual velocity of droplet is much larger for the volumetric flux of 12.73 L/(m2s) than the volumetric flux of 1.604 L/(m2s), which make the sidewall and bottom surface of grooves to be better cooled by spray at the volumetric flux of 12.73 L/(m2s). That is why the optimal heat transfer enhanced surfaces are different for two volumetric fluxes. A heat transfer model is derived which can accurately predict the heat fluxes of straight-grooved surfaces at the volumetric flux over 12.73 L/(m2s).
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影响因子：
5.2
作者：
K. A. Estes;I. Mudawar
通讯作者：
K. A. Estes;I. Mudawar
影响因子：
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作者：
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DOI：
10.1016/j.ijheatmasstransfer.2004.05.033
发表时间：
2004-11
影响因子：
5.2
作者：
Ruey-Hung Chen;L. Chow;J. E. Navedo
通讯作者：
Ruey-Hung Chen;L. Chow;J. E. Navedo
影响因子：
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作者：
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通讯作者：
Ruey-Hung Chen;D. S. Tan;Kuo-Chi Lin;L. Chow;A. Griffin;D. Rini
DOI：
10.1016/s0017-9310(03)00217-5
发表时间：
2003-09
影响因子：
5.2
作者：
Lanchao Lin;R. Ponnappan
通讯作者：
Lanchao Lin;R. Ponnappan