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Analytical and experimental studies for power-law fluids in a double-pass parallel-plate heat exchanger under asymmetric isotherm conditions

机译:非对称等温条件下双程平行板换热器中幂律流体的分析和实验研究

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The double-pass parallel-plate heat exchanger under asymmetric isotherm conditions referred to conjugated Graetz problem was proposed to enhance the thermal performance and investigated theoretically and experimentally. The analytical solutions were obtained using the separation of variables, superposition principle and an orthogonal expansion technique in terms of power series. The dependence of the average Nusselt number on the Graetz number and power-law index was formulated in a simplified expression. The theoretical predictions show that the power-law fluids in such a double-pass operation come up with the considerable heat-transfer efficiency improvement as compared with those in an open conduit (without an impermeable resistless sheet inserted), especially when the double-pass device was operated in larger Graetz numbers. This work shows that the good agreement was obtained between the experimental results and theoretical predictions. The effects of the ratio of asymmetric wall temperatures, impermeable-sheet position and power-law index on both the device performance enhancement and power consumption increment have also been presented.
机译:为了提高热性能,提出了在非对称等温条件下的双通道平行板换热器,以提高其热性能,并进行了理论和实验研究。使用变量的分离,叠加原理和正交展开技术根据幂级数获得了解析解。平均Nusselt数对Graetz数和幂律指数的依赖关系用简化的表达式表示。理论预测表明,与开放式管道(未插入不可渗透的无阻片)相比,在这种双程操作中的幂律流体的传热效率得到了显着提高。该设备以更大的Graetz编号运行。这项工作表明,在实验结果和理论预测之间取得了良好的一致性。还提出了不对称壁温比,不渗透片位置和幂律指数对器件性能增强和功耗增加的影响。

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