Critical heat flux of binary mixtures in pool boiling and its correlation in terms of Marangoni number
Critical heat flux of binary mixtures in pool boiling and its correlation in terms of Marangoni number
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DOI：
10.1016/s0140-7007(97)00026-1
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发表时间：
1997-12
期刊：
影响因子：
--
通讯作者：
Y. Fujita;Q. Bai
中科院分区：
文献类型：
--
作者：
Y. Fujita;Q. Bai
用直流加热的0.5mm铂丝测量了二元混合物在全浓度范围内的池核沸腾临界热流密度（CHF）。选择了七种混合物，旨在涵盖各种类型的混合物：甲醇/水、乙醇/水、甲醇/乙醇、乙醇/正丁醇、甲醇/苯、苯/正庚烷和水/乙二醇，每种在大气压下均处于饱和状态。在包括纯组分的75个浓度下获得了总共311个原始CHF数据。甲醇和乙醇的含水混合物显示显着增加的CHF相比，无论是CHF之间的线性插值纯组分或CHF预测从一个单一的组件的相关性与使用的混合物的属性。三种有机混合物表现出或多或少相同的水平作为插值CHF，而剩余的两种混合物的甲醇/苯和水/乙二醇给出了减少CHF的20%和50%，分别最多。Marangoni数被引入作为一个控制变量，以解释所观察到的增加，不变，或减少CHF，和经验的相关性。
Critical heat flux (CHF) in nucleate pool boiling of binary mixtures was newly measured with a horizontal platinum wire, 0.5 mm in diameter, and heated by DC, over the full range of concentrations. Seven mixtures were selected with the intent to cover various types of mixtures: methanol/water, ethanol/water, methanol/ethanol, ethanol/n-butanol, methanol/benzene, benzene/n-heptane and water/ethylene glycol, each in the saturated state at atmospheric pressure. Total 311 raw CHF data were obtained at 75 concentrations including pure components. Aqueous mixtures of methanol and ethanol revealed significant increase of CHF compared to either CHF linearly interpolated between pure components or CHF predicted from a single component correlation with use of the mixture properties. Three organic mixtures showed more or less the same level as an interpolated CHF, while the remaining two mixtures of methanol/benzene and water/ethylene glycol gave the reduced CHF by 20% and 50% at most, respectively. Marangoni number was introduced as a controlling variable to explain the observed increased, invariable, or reduced CHF, and an empirical correlation was developed.