Study of the Mechanism of Burn-Out in Boiling System of High Burn-Out Heat Flux
Study of the Mechanism of Burn-Out in Boiling System of High Burn-Out Heat Flux
复制标题
高烧毁热通量沸腾系统烧毁机理研究
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
M. Kunihiro
中科院分区：
文献类型：
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作者：
Y. Katto;M. Kunihiro
本文研究了两种特殊沸腾体系的燃尽现象，这两种沸腾体系都是在常压下水的饱和核态沸腾中实现的。首先，试图通过机械手段使在加热表面上周期性产生的蒸汽团强制塌陷。在这种情况下，燃尽热通量qc增加，但与蒸汽质量的崩溃有关的流体运动的速度受到限制，从而qc的增加是有限的。在这种情况下，烧断出现的机制，这是不同于普通池沸腾。由于蒸汽从加热表面的剧烈渗出而引起的液体飞溅中断了所供应的液体的一部分到达加热表面，使得加热表面上的液体量最终与热通量平衡，并且发生燃尽。对于这种类型的燃尽，通过提高液体射流的速度可以稳定地提高qc。
Burn-out phenomena are studied for two special systems of boiling which are both realized in the saturated nucleate boiling of water at atmospheric pressure on a horizontal 10mm dia. copper heated surface.First, it is attempted by mechanical means to cause a forced collapse of the vapor masses which are generated periodically on the heated surface. In this case, burn-out heat flux qc increases, but the velocity of fluid movement concerned with the collapse of vapor mass is restricted so that the increase of qc is limited.Second, the heated surface is supplied with liquid by means of a small liquid jet. In this case, burn-out appears with a mechanism which is different from ordinary pool boiling. Splashing of liquid due to the violent effusion of vapor from the heated surface interrupts the part of supplied liquid in reaching the heated surface so that the quantity of liquid on the heated surface balances finally the heat flux, and burn-out occurs. For the burn-out of this type, qc can be increased steadily by increasing the velocity of liquid jet.