Graphical '/> Thermal conductivity of composite materials: Alkali carbonate-based melts filled with fine α-Al_2O_3
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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal conductivity of composite materials: Alkali carbonate-based melts filled with fine α-Al_2O_3
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Thermal conductivity of composite materials: Alkali carbonate-based melts filled with fine α-Al_2O_3

机译：复合材料的导热性：填充有细α-Al_2O_3的碳酸盐基熔体

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Graphical abstractDisplay OmittedHighlights•The thermal conductivity (λ) of molten salt-Al2O3composites is first measured.•The thermal conductivity grows as the temperature and α-Al2O3concentration rise.•The temperature coefficient dλ/dT decreases sharply as the oxide content increases.•A correlation between the λ and the mean thickness of the molten salt gap is found.•A model is proposed for describing the heat transfer in the composites under study.AbstractThe thermal conductivity of composite materials, specifically alkali carbonate-based melts filled with fine α-Al2O3, was measured in relation to the temperature and thickening agent content using the steady-state coaxial cylinder method. The thermal conductivity was found to be a linear function of the temperature in the range from 670 K to 930 K for salt melts and all of the thickened melt-oxide mixtures that were studied, while this value increased non-linearly as the α-Al2O3volume fraction increased showing a tendency to be unchanged at α-Al2O3volume concentrations greater than 15%. The thermal conductivity of the (Li2CO3- Na2CO3- K2CO3)eut+ α-Al2O3composites measured was adequately described by the Maxwell-Wagner equations derived for two-phase heterogeneous materials. The alternating sign of the temperature coefficients of the composites thermal conductivity and peculiarities of its concentration dependency point to the existence of “ionic heat conductor - oxide heat insulator” transaction in alkali carbonate-based melts thickened with fine α-Al2O3.
机译： 图形摘要 省略显示 突出显示 • 熔融盐-Al 2 O 3的热导率（λ） 首先测量复合材料。 • < ce：para id =“ p0010” view =“ all”>散热孔随温度的升高，α-Al 2 O 3 的浓度升高。 • 随着氧化物含量的增加，温度系数dλ/ dT急剧下降。 • 找到了λ与熔盐间隙平均厚度之间的相关性。 • 提出了一种用于描述复合材料在下列条件下的传热的模型研究。 摘要 复合材料的导热系数，特别是填充有细α-Al的碳酸盐基熔体的导热系数使用稳态同轴圆筒法测量“ post 2” O 3 与温度和增稠剂含量的关系。对于盐熔体和所研究的所有增稠的熔体氧化物混合物，热导率是温度在670 K至930 K范围内的线性函数，而该值随α-Al呈非线性增加 2 O 3 体积分数增加，显示在α-Al 2 O 3 体积浓度大于15％。 （Li 2 CO 3 -Na 2 CO 3 -K 2 CO < ce：inf loc =“ post”> 3 ）出口 +α-Al 2 < / ce：inf> O 3 的复合物可以通过针对两相异质材料导出的Maxwell-Wagner方程来充分描述。复合材料导热系数的温度系数的交替符号和其浓度依赖性的特点表明，在细α-Al 2 O 3 。

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