Numerical investigation of entropy generation and double-diffusive natural convection for nanofluid flow inside a hexagonal enclosure with different hot obstacles

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL Journal of Thermal Analysis and Calorimetry Pub Date : 2024-08-06 DOI:10.1007/s10973-024-13513-w
Fahad Sikander, Taghreed A. Assiri, Tanveer Fatima, Ebrahem A. Algehyne, Muhammad Ibrahim, Nudrat Aamir
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Abstract

In this paper, a simulation is performed on nanofluids flow with double-diffusive natural convection. The enclosure is hexagonal, and hot obstacles of various shapes are placed inside it. The partial differential equations governing fluid flow and heat and mass transfer are solved using the finite element method. Mass diffusion, characterized by the Lewis number (Le), is a significant parameter affecting the behavior of two-phase flow. This parameter is the most influential parameter in concentration distribution. Temperature, velocity, and concentration fields inside the enclosure are analyzed using temperature, velocity, and concentration contours. The results of this study show that increasing the Le from 1 to 5 causes a reduction in the \(\overline{{{\text{Nu}}}}\) by 11.23%, 11.7%, 11.95%, and 11.03% and an increase in the \(\overline{{{\text{Sh}}}}\) by 64.41%, 70.82%, 69.64%, and 69.60% for circular, triangular, rectangular, and rhombus obstacles, respectively. Increasing the aspect ratio (AR) from 0.1 to 0.3 leads to an increase in the \(\overline{{{\text{Nu}}}}\) by 49%, 36%, 33.7%, and 45.3% and an increase in the \(\overline{{{\text{Sh}}}}\) by 48.8%, 39.4%, 44.3%, and 47.6% for circular, triangular, rectangular, and rhombus obstacles, respectively. The average Be decreases with an increase in the AR and increases with an increase in the Le. Increasing the Le leads to a decrease in fluid entropy generation (ENT) and total ENT but increases the AR, which increases fluid ENT and total ENT. However, the change in both thermal ENTs did not result in any significant change.

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带不同热障碍物的六边形围墙内纳米流体流动的熵生成和双扩散自然对流的数值研究
本文对具有双扩散自然对流的纳米流体流动进行了模拟。外壳为六边形,内部放置了各种形状的热障碍物。流体流动、传热和传质的偏微分方程采用有限元法求解。以路易斯数(Le)为特征的质量扩散是影响两相流行为的一个重要参数。该参数是对浓度分布影响最大的参数。利用温度、速度和浓度等值线分析了外壳内的温度场、速度场和浓度场。研究结果表明,对于圆形、三角形、矩形和菱形障碍物,Le 值从 1 增加到 5 会使\(\overline{{text/{Nu}}}}\) 分别减少 11.23%、11.7%、11.95% 和 11.03%,使\(\overline{{text/{Sh}}}}\) 分别增加 64.41%、70.82%、69.64% 和 69.60%。长宽比(AR)从 0.1 增加到 0.3 会导致圆形、三角形、矩形和菱形障碍物的 \(\overline{{text\{Nu}}}}\) 分别增加 49%、36%、33.7% 和 45.3%, \(\overline{{text\{Sh}}}}\) 分别增加 48.8%、39.4%、44.3% 和 47.6%。平均 Be 随 AR 的增大而减小,随 Le 的增大而增大。增加 Le 会导致流体熵产生量(ENT)和总熵产生量减少,但增加 AR 会增加流体熵产生量和总熵产生量。然而,两个热熵值的变化并没有导致任何显著变化。
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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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