Numerical analysis of unsteady free convection of Al2O3 inside a tubular reactor under the influences of exothermic reaction, and inclined MHD as an application to chemical reactor

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2024-10-01 DOI:10.1016/j.rinp.2024.107993

Hussein H. Alaydamee , Mohammed Azeez Alomari , Qusay H. Al-Salami , Farah Q.A. Alyousuf , Faris Alqurashi , Mujtaba A. Flayyih

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Abstract

This paper delves into the numerical investigation of aluminum oxide–water nanofluid thermal and dynamic performances under the influences of magnetic field application and chemical reaction, utilizing the Finite Element Method within a circular enclosure containing three inner tubes, as an application to the heat exchanging phenomenon between the reactive shell of the cavity and the surface of the triple tubes. Various governing parameters were studied for their interaction on the nanofluid flow and heat transmission rate within the proposed geometry, including the Rayleigh parameter (

10^{3} \leq R a \leq 10^{5}

), Hartmann parameter (

0 \leq H a \leq 61

), nanoparticles concentration (

0 \leq \emptyset \leq 6 \times 10^{- 2}

), magnetic rotational angle (

0^{o} \leq γ \leq 90^{o}

), and Frank-Kamenetskii parameter (

0 \leq F_{k} \leq 3

). The results indicated that raising Ra from 10³ to 10⁵ results in expediting the nanofluid velocity by 10.62 % and 100 % respectively as well as raising the total heat transfer efficiency. The nanofluid speed was also increased by 28.57 % when F_k has to further increase to a value of 3. When there was no exothermic activity present, the rate of heat transmission was at its lowest, and it was greater when the F_k value was 3. Similarly, there were discernible impacts in various areas of the geometry as the Ha number intensified and the Nu_avg decreased. Improvements in local and mean Nusselt parameters are observed when the concentration of nanoparticles is increased, suggesting better heat transfer, achieving an increase by 7 % in the average Nusselt number. This research emphasizes the importance of nanoparticle concentration in raising the medium’s rates of heat transmission, contributing to advancements in energy storage development.

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放热反应影响下管式反应器内 Al2O3 的非稳定自由对流数值分析，以及倾斜 MHD 在化学反应器中的应用

本文采用有限元法，对氧化铝-水纳米流体在磁场应用和化学反应影响下的热性能和动态性能进行了数值研究，并将其应用于包含三根内管的圆形外壳中，以研究空腔的反应外壳与三根内管表面之间的热交换现象。研究了各种调节参数，包括瑞利参数（103≤Ra≤105）、哈特曼参数（0≤Ha≤61）、纳米颗粒浓度（0≤∅≤6×10-2）、磁旋转角（0o≤γ≤90o）和弗兰克-卡缅涅茨基参数（0≤Fk≤3），以了解它们对拟议几何形状内纳米流体流动和热传递率的影响。结果表明，将 Ra 值从 103 提高到 105 后，纳米流体的速度分别提高了 10.62 % 和 100 %，总传热效率也提高了。当 Fk 值进一步增加到 3 时，纳米流体的速度也提高了 28.57%。当没有放热活动时，热量传输率最低，而当 Fk 值为 3 时，热量传输率更高。同样，随着 Ha 值的增加和 Nuavg 的降低，几何体的各个区域都受到了明显的影响。当纳米粒子的浓度增加时，局部和平均努塞尔特参数都有所改善，表明传热效果更好，平均努塞尔特数增加了 7%。这项研究强调了纳米粒子浓度在提高介质热传导率方面的重要性，有助于推动储能技术的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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