The Maximum and Minimum Values of the Heat Q Transmitted from Metal to Boiling Water under Atmospheric Pressure
The Maximum and Minimum Values of the Heat Q Transmitted from Metal to Boiling Water under Atmospheric Pressure
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DOI：
10.1299/jsmemagazine.37.206_367
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发表时间：
1966-12
期刊：
影响因子：
--
通讯作者：
S. Nukiyama
中科院分区：
文献类型：
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作者：
S. Nukiyama
从金属表面传递到沸水的热量随着温差ΔT的增加而增加，但在ΔT达到一定限度后，量Q随着ΔT的进一步增加而减少。这个转折点是传递的热的最大值。这一点的存在实际上是在实验中观察到的。在大气压下，对应于100℃时水的最大热传递值的ΔT在20℃到40℃之间，Q在1080000到1800000千卡/m2·h之间(即，如果在100℃下以恒定蒸发率表示，在2000到3000 kg/m2·h之间)；这个数字大于以前认为的最大热传递值。在高温区的Q-−Δ-T曲线中，讨论了烧毁效应。
The quantity of heat transmitted from a metal surface to boiling water increases as the temperature difference ΔT is increased, but after the ΔT has reached a certain limit, quantity Q decreases with further increase in ΔT. This turning point is the maximum value of heat transmitted. The existence of this point was actually observed in the experiment. Under atmospheric pressure, ΔT corresponding to the maximum value of heat transfer for water at 100°C falls between 20 degC to 40 degC, and Q is between 1080000 and 1800000 kcal/m2 h (i.e. between 2000 and 3000 kg/m2h, if expressed in constant evaporation rate at 100°C) ; this figure is larger than the maximum value of heat transfer as was previously considered. Also, the minimum value of heat transfer was obtained, and in the Q−ΔT curve for the high temperature region, the burn-out effect is discussed.