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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Measurement of anisotropic energy transport in flowing polymers by using a holographic technique.
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Measurement of anisotropic energy transport in flowing polymers by using a holographic technique.

机译：通过使用全息技术测量流动聚合物中的各向异性能量传输。

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摘要

Almost no experimental data exist to test theories for the nonisothermal flow of complex fluids. To provide quantitative tests for newly proposed theories, we have developed a holographic grating technique to study energy transport in an amorphous polymer melt subject to flow. Polyisobutylene with weight-averaged molecular mass of 85 kDa is sheared at a rate of 10 s(-1), and all nonzero components of the thermal conductivity tensor are measured as a function of time, after cessation. Our results are consistent with proposed generalizations to the energy balance for microstructural fluids, including a generalized Fourier's law for anisotropic media. The data are also consistent with a proposed stress-thermal rule for amorphous polymer melts. Confirmation of the universality of these results would allow numerical modelers to make quantitative predictions for the nonisothermal flow of polymer melts.
机译：几乎没有实验数据可用于测试复杂流体的非等温流动。为了为新提出的理论提供定量检验，我们开发了全息光栅技术来研究在流动的无定形聚合物熔体中的能量传输。重均分子量为85 kDa的聚异丁烯以10 s（-1）的速率被剪切，停止后，导热系数张量的所有非零分量都作为时间的函数进行测量。我们的结果与对微结构流体能量平衡的拟议概括相一致，其中包括对各向异性介质的广义傅立叶定律。该数据也与针对非晶态聚合物熔体的拟议应力-热定律一致。这些结果的普遍性的确认将允许数值建模者对聚合物熔体的非等温流动做出定量预测。

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