利用晶格玻尔兹曼方法研究自然对流的不稳定性:空腔宽高比效应

IF 1.1 4区 工程技术 Q4 ENGINEERING, MECHANICAL
El Mehdi Berra, M. Faraji
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引用次数: 0

摘要

本文采用格子Boltzmann方法,数值研究了由顶壁冷却的局部加热空腔中的自然对流不稳定流动;并且空腔被部分加热并且包含来自下方的热源,该热源被呈现为电子部件。为了跟踪空腔纵横比随时间对传热的影响,首先,通过将空腔的纵横比从[公式:见正文]变为[公式:见图正文]来完成一系列数值模拟。结果表明,长宽比的变化对传热行为,特别是空腔内的温度分布有显著影响,所获得的数值结果表明了两种不同的温度分布状态:稳定稳定状态和稳定振荡状态。在第二步中,对[公式:见正文]的纵横比配置进行了数值模拟,以研究进入空腔的自然对流不稳定性。结果表明,空腔结构对空腔内的传热有重要影响。选择格子Boltzmann方法作为一种数值模拟方法是因为它在流体流动模拟中取得了可观的结果,也因为它的实现简单,它已经成为解决流体动力学和热问题的一种合适的替代方法,并因其实现的简单性而挑战了许多领域的传统方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Natural Convection Instabilities Using the Lattice Boltzmann Method: Cavity Aspect Ratio Effect
In this paper, the natural convection instability flows in a partial heating cavity filled with air and cooled by the top wall are numerically investigated using the lattice Boltzmann method; and the cavity is partially heated and contains a heat source from below that is presented as an electronic component. To track the cavity aspect ratio effect on the heat transfer over time, first, a series of numerical simulations is completed by varying the aspect ratio of the cavity from [Formula: see text] to [Formula: see text]. The results show that the change in aspect ratio has a noticeable impact on the heat transfer behavior, specifically on the temperature distribution in the cavity, and the numerical results obtained indicate two different temperature distribution regimes: a stable steady regime, and a stable oscillatory regime. In the second step, a numerical simulation is done to study the natural convection instability into the cavity for the aspect ratio configuration of [Formula: see text]. The results show that the cavity structure has an important effect on the heat transfer in the cavity. The lattice Boltzmann method choice as a numerical simulation approach is due to its considerable result in fluid flow simulation and also to its simplicity of implementation, and it has become a suitable alternative method for solving fluid dynamics and thermal problems, as well as challenged traditional methods in many sectors by its simplicity of implementation.
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来源期刊
Journal of Thermophysics and Heat Transfer
Journal of Thermophysics and Heat Transfer 工程技术-工程:机械
CiteScore
3.50
自引率
19.00%
发文量
95
审稿时长
3 months
期刊介绍: This Journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. The Journal publishes qualified papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include aerothermodynamics; conductive, convective, radiative, and multiphase modes of heat transfer; micro- and nano-scale heat transfer; nonintrusive diagnostics; numerical and experimental techniques; plasma excitation and flow interactions; thermal systems; and thermophysical properties. Papers that review recent research developments in any of the prior topics are also solicited.
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