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首页> 外文期刊>International Journal of Heat and Mass Transfer >Conjugate forced convection transient flow and heat transfer analysis in a hexagonal, partitioned, air filled cavity with dynamic modulator
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Conjugate forced convection transient flow and heat transfer analysis in a hexagonal, partitioned, air filled cavity with dynamic modulator

机译：六角形，分区，带有动态调制器的六角形，分区，空气填充腔中的缀合强制对流瞬态流量和传热分析

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Background: - Forced convection heat transfer in a cavity is of great importance due to its strong relevance to the practical aspects. Most of the studies focus on this topic from a steady perspective. But adding a flow modulator enhances a system's thermodynamic performance and makes such a system more realistic and widens the field of application. Such studies are unsteady and often quite expensive. As a result, only a few literatures are available with very idealistic geometric configuration and boundary conditions. Methodology: - Two-dimensional unsteady continuity, momentum and energy equations are used for the mathematical modeling of the problem incorporating the Boussinesq approximation. A free triangular discretization scheme is adopted to solve the moving mesh problem by formulating the Arbitrary Lagrangian Euler (ALE) finite element approach. Parameters: - Numerical studies are carried out for a fixed Prandtl number (Pr = 0.71) and fixed geometry of the rotating blade while varying the other parameters i.e. Rayleigh number, Reynolds number and Biot number. This dynamic boundary problem encompasses a wide range of parameters i.e. (100 ≤ Re ≤ 10~3), (10~3 ≤ Bi ≤ 10~4) and (10~4 ≤ Ra ≤ 10~7) to evaluate the thermodynamic behavior of the thermo-fluid system. External flow condition is taken into consideration in terms of Biot number. Effects of these parameters are visualized through streamlines, heatlines, spatially average Nusselt number evaluated on the heated surface and system effectiveness. Objective: - Present computational study focuses on the transient analysis of the conjugate forced convection flow and heat transfer characteristics in a hexagonal, air filled cavity. This cavity is equipped with a floor heater of constant heat flux under the rotational influence of an adiabatic flow modulator. And the blade is placed in the central position of the cavity which is rotating in the clockwise direction. Also, the whole computational domain is composed of four different domains, one convective domain and three solid domains. The solid domains are made of brick and glass as per their practical aspects. Findings: - A Fast Fourier Transform (FFT) analysis is presented to comprehend the thermo-oscillating system response. FFT plots indicate that for all of the cases the fundamental frequency of the system response conforms to the blade frequency. Moreover, present numerical results show that the heat transfer effectiveness has an inverse relationship with the Biot and Rayleigh numbers while improves significantly with the increase of Reynolds number and reaches a critical state for Re_(cr) = 650. Higher Reynolds number also attenuates the degree of power spectrum. Conclusion: - To attain a higher heat transfer effectiveness the thermo - fluid system should be operated at low Rayleigh number with higher Reynolds number.
机译：背景：由于与实际方面的强烈相关，腔中的强制对流热传递具有重要意义。大多数研究从稳定的角度侧重于这个主题。但添加流调制器增强了系统的热力学性能，并使这样的系统更加现实并扩大了应用领域。这些研究不稳定，通常很贵。因此，只有少数文献具有非常理想的几何配置和边界条件。方法论： - 二维不稳定连续性，动量和能量方程用于结合BoussinesQ近似的问题的数学建模。采用自由三角形离散化方案来解决任意拉格朗日欧拉（ALE）有限元方法来解决移动网格问题。参数： - 用于固定的Prandtl号（Pr = 0.71）的数值研究，以及旋转刀片的固定几何形状，同时改变其他参数I.e.RayLeigh号码，雷诺数和Biot数。这种动态边界问题包括各种参数，即（100≤Re≤10〜3），（10〜3≤bi≤10〜4）和（10〜4≤RA≤10〜7），以评估热力学行为热流体系统。在Biot号方面考虑了外部流动条件。这些参数的效果通过精简，热线，在加热表面和系统效力上评估的空间平均露天数。目的： - 目前的计算研究重点研究了六角形，空气填充腔中共轭强制对流流和传热特性的瞬态分析。该腔体配备有绝热性流动调制器的旋转影响的恒定热通量的地板加热器。并且刀片放置在腔的中心位置，该腔的沿顺时针方向旋转。此外，整个计算域由四个不同的域，一个对流域和三个固体域组成。根据其实际方面，固体域由砖和玻璃制成。调查结果： - 提出了一种快速傅里叶变换（FFT）分析来理解热振荡系统响应。 FFT图表明，对于所有情况，系统响应的基频符合刀片频率。此外，存在的数值结果表明，随着雷诺数的增加，传热效能与Biot和Rayleigh数量的反向关系，同时随着雷诺数的增加而改善，并且达到RE_（CR）= 650的临界状态。更高的雷诺数也衰减了程度功率谱。结论： - 以获得更高的传热效率，热流体系统应在低瑞利数，雷诺数较高。

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