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Experimental Measurements of Thermal Conductivity for Non-Newtonian Polymeric Fluids Using a Concentric Cylindrical Cell Under Static Conditions
International Journal of Thermophysics ( IF 2.2 ) Pub Date : 2021-03-29 , DOI: 10.1007/s10765-021-02834-9
Waleed M. Abed

In the current article, the experimental measurement of thermal conductivities for non-Newtonian polymeric fluids has been performed over a wide range of polymer concentrations. Measurements of the thermal conductivity for three Newtonian fluids and three different groups of non-Newtonian polymeric aqueous fluids (twenty-four polymeric solutions) under static conditions are conducted using the cell of concentric cylinders with the annular gap of 0.4 mm. Various polymer concentrations ranged from 100 ppm to 5000 ppm by weight are implemented in the experiments with temperature changed from 20 °C to 50 °C. Accordingly, the impact of relevant non-Newtonian fluid parameters, such as polymer concentrations, polymer types and molecular weights as well as the kind of solvents on the thermal conductivity of non-Newtonian fluids were systematically tested. The experimental results of thermal conductivity for the Newtonian fluids (distilled water, 50 % methanol-50 % water and 50 % glycerin-50 % water) are in a reasonable agreement with the previously published data with the differences always being less than 4.5 %. Moreover, thermal conductivities of non-Newtonian polymeric solutions are approximately the same values of Newtonian fluids with the corresponding temperatures under rest condition and any fluctuation in the measured data is within the permissible error uncertainty. Although, the addition of polymeric particles has the ability to turn the state of the fluid from Newtonian to non-Newtonian, there is no noteworthy influence on the thermal conductivity of these non-Newtonian fluids.



中文翻译:

在静态条件下使用同心圆柱单元对非牛顿聚合物流体的导热系数进行实验测量

在当前文章中,非牛顿聚合物流体的热导率的实验测量已在多种聚合物浓度范围内进行。使用具有0.4 mm环形间隙的同心圆柱体单元,在静态条件下测量三种牛顿流体和三种不同组的非牛顿聚合物水性流体(二十四种聚合物溶液)的热导率。在实验中,温度从20°C变为50°C,实现了100 ppm至5000 ppm重量范围的各种聚合物浓度。因此,系统地测试了相关的非牛顿流体参数(例如聚合物浓度,聚合物类型和分子量以及溶剂种类)对非牛顿流体导热系数的影响。牛顿流体(蒸馏水,50%甲醇-50%水和50%甘油-50%水)的热导率实验结果与先前公布的数据合理吻合,差异始终小于4.5%。此外,非牛顿聚合物溶液的热导率在静止条件下与相应温度下的牛顿流体的热导率近似相同,并且测量数据的任何波动都在允许的误差不确定性范围内。尽管添加聚合物颗粒具有将流体状态从牛顿流体转变为非牛顿流体的能力,但是对这些非牛顿流体的热导率没有显着影响。50%的甲醇(50%的水)和50%的甘油(50%的水)与先前公布的数据在合理的范围内,差异始终小于4.5%。此外,非牛顿聚合物溶液的热导率在静止条件下与相应温度下的牛顿流体的热导率近似相同,并且测量数据的任何波动都在允许的误差不确定性范围内。尽管添加聚合物颗粒具有将流体状态从牛顿流体转变为非牛顿流体的能力,但是对这些非牛顿流体的热导率没有显着影响。50%的甲醇(50%的水)和50%的甘油(50%的水)与先前公布的数据在合理的范围内,差异始终小于4.5%。此外,非牛顿聚合物溶液的热导率在静止条件下与相应温度下的牛顿流体的热导率近似相同,并且测量数据的任何波动都在允许的误差不确定性范围内。尽管添加聚合物颗粒具有将流体状态从牛顿流体转变为非牛顿流体的能力,但是对这些非牛顿流体的热导率没有显着影响。在静止条件下,非牛顿聚合物溶液的热导率与相应温度下的牛顿流体的值大致相同,并且测量数据的任何波动都在允许的误差不确定性范围内。尽管添加聚合物颗粒具有将流体状态从牛顿流体转变为非牛顿流体的能力,但是对这些非牛顿流体的热导率没有显着影响。在静止条件下,非牛顿聚合物溶液的热导率与相应温度下的牛顿流体的值大致相同,并且测量数据的任何波动都在允许的误差不确定性范围内。尽管添加聚合物颗粒具有将流体状态从牛顿流体转变为非牛顿流体的能力,但是对这些非牛顿流体的热导率没有显着影响。

更新日期:2021-03-29
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