Department of Mechanical Engineering, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-85858, Japan.
Department of Mechanical and Physical Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-85858, Japan.
Philos Trans A Math Phys Eng Sci. 2023 May;381(2246):20220116. doi: 10.1098/rsta.2022.0116. Epub 2023 Mar 13.
This study experimentally and numerically investigated the thermo-fluid dynamics of Taylor-Couette flow with an axial temperature gradient from the chemical engineering perspective. A Taylor-Couette apparatus with a jacket vertically divided into two parts was used in the experiments. Based on the flow visualization and temperature measurement for glycerol aqueous solutions with various concentrations, the flow pattern was classified into six modes: heat convection dominant mode (Case I), heat convection-Taylor vortex flow alternate mode (Case II), Taylor vortex flow dominant mode (Case III), fluctuation maintaining Taylor cell structure mode (Case IV), segregation between Couette flow and Taylor vortex flow mode (Case V) and upward motion mode (Case VI). These flow modes weremapped in terms of the Reynolds and Grashof numbers. Cases II, IV, V and VI are regarded as transition flow patterns between Case I and Case III, depending on the concentration. In addition, numerical simulations showed that in Case II, heat transfer was enhanced when the Taylor-Couette flow was altered by heat convection. Moreover, the average Nusselt number with the alternate flow was higher than that with the stable Taylor vortex flow. Thus, the interaction between heat convection and Taylor-Couette flow is an effective tool to enhance heat transfer. This article is part of the theme issue 'Taylor-Couette and related flows on the centennial of Taylor's seminal paper (Part 2)'.
本研究从化学工程的角度，对具有轴向温度梯度的泰勒-库埃特流的热流体动力学进行了实验和数值研究。实验中使用了一种具有垂直分为两部分夹套的泰勒-库埃特装置。基于对不同浓度甘油水溶液的流动可视化和温度测量，将流动模式分为六种模式：热对流主导模式（Case I）、热对流-泰勒涡旋流交替模式（Case II）、泰勒涡旋流主导模式（Case III）、保持泰勒胞结构的波动模式（Case IV）、库埃特流和泰勒涡旋流之间的分离模式（Case V）和向上运动模式（Case VI）。这些流动模式根据雷诺数和格拉肖夫数进行了映射。Case II、IV、V 和 VI 被认为是 Case I 和 Case III 之间的过渡流动模式，这取决于浓度。此外，数值模拟表明，在 Case II 中，当热对流改变泰勒-库埃特流时，传热得到增强。此外，交替流的平均努塞尔数高于稳定的泰勒涡旋流的平均努塞尔数。因此，热对流和泰勒-库埃特流的相互作用是增强传热的有效工具。本文是主题为“泰勒-库埃特及相关流百年纪念（第 2 部分）”的一部分。
