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Flow boiling critical heat flux on small heated regions

机译：在较小的受热区域内流动沸腾临界热通量

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Abstract: Often, in optical and electronic equipment, heating is concentrated in very small regions, and, because of materials constraints, cooled walls must be as thin as possible. Also, for efficiency, many high-flux cooling designs involve forced- convection boiling heat transfer. Though efficient, a design with boiling heat transfer can be difficult for it must properly account for the complexities of the boiling flux-temperature relationship. Of concern is locating the point of incipience to boiling and the point of maximum nucleate boiling heat flux, Critical Heat Flux (CHF), and describing the complex behaviors in the vicinities of these points. Characteristics of boiling near these points are discussed in terms of boundary layer behavior. Changes in either the heater size or the wall thickness affects the boiling curve, particularly the CHF behavior. Results from experiments which were conducted on small, heated regions are discussed in light of their application to the design of high- power optical and electronic devices. The effects of flow velocity, subcooling, pressure, heating length, dissolved gas content, and flow streamline curvature are addressed. !38
机译：摘要：通常，在光学和电子设备中，热量集中在很小的区域，并且由于材料的限制，冷却后的壁必须尽可能薄。同样，为了提高效率，许多高通量冷却设计都涉及强制对流沸腾传热。尽管有效，但是沸腾传热的设计可能很困难，因为它必须适当考虑沸腾通量-温度关系的复杂性。值得关注的是确定沸点的起始点和最大核沸腾热通量临界热通量（CHF）的点，并描述这些点附近的复杂行为。根据边界层行为讨论了这些点附近的沸腾特性。加热器尺寸或壁厚的变化都会影响沸腾曲线，特别是CHF行为。讨论了在加热的小区域进行的实验结果，并将其应用于大功率光学和电子设备的设计。讨论了流速，过冷，压力，加热长度，溶解气体含量和流线弯曲度的影响。 ！38

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