玻璃珠多孔介质中不同渗透率和正弦壁温的自由对流传热流动

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
Mohammad M. Rahman, M. Ziad Saghir, Kuppalapalle Vajravelu, Ioan Pop
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引用次数: 0

摘要

本研究探讨了在工作流体和多孔介质的局部热非平衡条件下,不同渗透率和正弦壁温波动对填充有玻璃珠多孔介质的矩形外壳内自然对流驱动的时间传热流的影响。假设流体的导热系数是可变的,并使用达西-布林克曼-福克海默模型来描述流体流动。Galerkin 型有限元法模拟了控制流动和传热的构成方程。模拟探索了不同模型参数对流场和热场的影响。结果表明,在稳定状态下(\(\tau = 1.0\)),当玻璃珠直径 Dp 从 0.01 增大到 1.0 时,\(\overline{{text/{Nu}}_{{text/{f}} }}}\) 和\(\overline{{text/{Nu}}_{{text/{s}} }}\) 的值分别下降了 48.8% 和 26%。此外,随着波频 n 从 1 增加到 4,流体的努塞尔特数增加了 280.61%,而固体的努塞尔特数增加了 266.55%。此外,当波幅 B 从 0.1 增至 1 时,这些物理量分别增加了 629.71% 和 91.405%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Free convective heat transfer flow in a glass bead porous medium varying permeability and sinusoidal wall temperature

Free convective heat transfer flow in a glass bead porous medium varying permeability and sinusoidal wall temperature

This study examines the effects of varying permeability and sinusoidal wall temperature fluctuations on the temporal heat transfer flow driven by natural convection inside a rectangular enclosure filled with a glass bead porous medium under local thermal nonequilibrium conditions for both the working fluid and the porous medium. The fluid’s thermal conductivity is assumed to be variable, and a Darcy–Brinkman–Forchheimer model is used to describe the fluid flow. The Galerkin-type finite element method simulates the constitutive equations governing the flow and heat transfer. The simulation explores the influence of different model parameters on the flow and thermal fields. The results indicate that at a steady state (\(\tau = 1.0\)), when glass bead diameter Dp increased from 0.01 to 1.0, the values of \(\overline{{{\text{Nu}}_{{\text{f}}} }}\) and \(\overline{{{\text{Nu}}_{{\text{s}}} }}\) decreased by 48.8% and 26%, respectively. Besides, the value of the Nusselt number for the fluid increased by 280.61%, whereas the Nusselt number for the solid increased by 266.55% with the increase of the wave frequency n from 1 to 4. Furthermore, these physical quantities increased by 629.71% and 91.405% when the wave amplitude B rose from 0.1 to 1.

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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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