石墨烯修饰水凝胶中的非稳态传热

IF 1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
B. G. Pokusaev, A. A. Moshin, D. P. Khramtsov, D. A. Nekrasov, A. V. Vyazmin, S. P. Karlov, I. A. Mikhailova
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引用次数: 0

摘要

在这项研究中,我们研究了在经历相变的石墨烯修饰水凝胶中对流流动的出现,并确定了这种体系的热物理特征;结果与数值模拟数据进行了比较。我们分析了石墨烯对应用于生物3D打印技术的水凝胶材料传热性能的影响。利用全息干涉法、梯度量热法以及由此产生的折射率的温度依赖性,我们开发了用于计算石墨烯外加剂水凝胶材料热物理参数的计算复合物。研究表明,即使石墨烯混合物的浓度很小,也会对材料的热物理性质产生很大的影响。研究还表明,石墨烯添加剂降低了水凝胶样品的粘度,这是通过Höppler粘度计测量的。利用实验得到的含石墨烯水凝胶的热物理和流变性能以及数值模拟的结果,计算了含石墨烯水凝胶实验细胞中相应对流换热模式的瑞利数。瑞利数(Ra)显示了材料传热及其对流特性的实质性差异,这取决于系统的粘度、密度、导热系数和其他参数。在我们的案例中,瑞利数的变化表明了不同石墨烯水凝胶的热性能和水动力性能的差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nonstationary Heat Transfer in Graphene-Modified Hydrogels

In this study, we investigate the emergence of convective flows in graphene-modified hydrogels experiencing phase transition and determine the thermophysical characteristics of such systems; the results are compared with numerical simulation data. We analyze the effect of graphene on the heat-transfer properties of hydrogel materials as applied to 3D bioprinting technologies. Using holographic interferometry, gradient calorimetry, and resulting temperature dependences of refractive indices, we have developed the computational complex for calculating the thermophysical parameters of hydrogel materials with graphene admixtures. It has been established that even insignificant concentrations of graphene admixture substantially affects the thermophysical properties. It is also shown that a graphene admixture reduces the viscosity of hydrogel samples, which is measured by the Höppler viscometer. Using the experimentally obtained thermophysical and rheological properties of hydrogels with graphene and the results of numerical simulation, we have calculated the Rayleigh numbers for the corresponding convective heat-exchange modes in the experimental cells with a hydrogel. The Rayleigh number (Ra) demonstrates substantial differences in the heat transfer of the material and its convective properties that depend on the viscosity, density, thermal conductivity, and other parameters of the system. In our case, the variations of the Rayleigh number indicate the difference in the thermal and hydrodynamic properties of different hydrogels with graphene.

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来源期刊
CiteScore
1.90
自引率
9.10%
发文量
130
审稿时长
3-6 weeks
期刊介绍: Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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