Case Studies in Thermal Engineering最新文献_第4页

Investigation of the arrangement of aluminum fins on the thermal behavior of lauric acid as a phase change material in a two-pipe heat exchanger by CFD simulation 通过 CFD 模拟研究铝翅片排列对双管热交换器中作为相变材料的月桂酸热行为的影响

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.csite.2024.105469

Weidong Liu , Majid Mokhtari , Muntadher Abed Hussein , Anjan Kumar , Talib M. Albayati , Pardeep Singh Bains , Hadeel Kareem Abdul-Redha , Soheil Salahshour , M. Hekmatifar

Background

Phase change material (PCM) thermal storage systems store more thermal energy per unit volume than sensible heat storage systems. PCMs offer a potential solution to reduce energy consumption in various thermal engineering applications. This study aimed to examine how fin arrangement affected the thermal efficiency and melting time of PCMs.

Methods

A two-dimensional numerical analysis of the melting process of lauric acid in a heat exchanger featuring two pipelines and fins was conducted using CFD simulation. In most previous investigations, the heat transfer fluid was a single-phase liquid. An enthalpy-porosity technique was used to model the solid and liquid phases of PCM. The governing equations were solved using the commercial software ANSYS Fluent 2021, and the pressure and velocity equations were coupled using the SIMPLE algorithm.

Significant findings

The best model among the 13 tested was Model 5, which featured 6 fins and a consistent angle of 60°. For Model 5, the melting time was 1818.3 s. Due to sensible heating, the fin's temperature (Temp) rose gradually from 300 K to 318 K. Temp then gradually increased as the PCM melted in the phase transition zone between 316.5 K and 321.2 K. Once the phase transition was complete, the PCM's Temp steadily rose from 324 K to 340 K. In Model 5, the inner wall Temp and the maximum Temp of the PCM were closest, at 327.34 K and 333.55 K, respectively. The thermal shock between the PCM and the ambient Temp caused a peak heat flux at the beginning of the PCM loading process.

背景相变材料（PCM）蓄热系统与显热蓄热系统相比，单位体积可存储更多热能。在各种热工应用中，相变材料为降低能耗提供了一种潜在的解决方案。本研究旨在探讨翅片排列如何影响 PCM 的热效率和熔化时间。方法利用 CFD 仿真对具有两条管道和翅片的热交换器中月桂酸的熔化过程进行了二维数值分析。在之前的大多数研究中，传热流体都是单相液体。采用焓-孔隙度技术对 PCM 的固相和液相进行建模。使用商业软件 ANSYS Fluent 2021 对控制方程进行了求解，并使用 SIMPLE 算法对压力和速度方程进行了耦合。在模型 5 中，鳍片的内壁温度和 PCM 的最高温度最为接近，分别为 327.34 K 和 333.55 K。PCM 与环境温度之间的热冲击在 PCM 加载过程开始时导致热通量达到峰值。

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引用次数: 0

Piezothermoelastic interaction in piezoelectric rods induced by a timed laser pulse without energy dissipation 无能量耗散定时激光脉冲诱导压电棒中的压热弹相互作用

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.csite.2024.105470

Zuhur Alqahtani , Ibrahim Abbas , Alaa A. El-Bary

The main aim of this article is to study the piezo-thermoelastic interaction in piezoelectric rods without energy dissipation due to a laser heat source with a timed pulse. Laplace transforms are used to represent the analytical solutions in the transformations domain. The governing equations of piezo-thermoelasticity in the Green and Naghdi model (GNII model without energy dissipation) in the presence of a laser heat source with a timed pulse are solved exactly in the Laplace domain, calculating the temperature, the stress, the displacement, and the electric potential. Numerical Laplace inversion is then used to find the general solution of the variables under study, which are then graphically shown.

本文的主要目的是研究压电棒中的压电热弹相互作用，而不考虑定时脉冲激光热源造成的能量耗散。拉普拉斯变换用于表示变换域中的解析解。在拉普拉斯域中精确求解了格林和纳格迪模型（无能量耗散的 GNII 模型）中存在定时脉冲激光热源时的压电热弹性控制方程，计算了温度、应力、位移和电动势。然后使用数值拉普拉斯反演法找到所研究变量的一般解，并以图形显示出来。

引用次数: 0

Efficient thermal integration model based on a biogas-fired gas turbine cycle (GTC) for electricity and desalination applications; thermo-economic and GA-based optimization 基于发电和海水淡化应用的沼气燃气轮机循环 (GTC) 的高效热集成模型；基于热经济和 GA 的优化

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.csite.2024.105492

Amr S. Abouzied , Sarminah Samad , Azher M. Abed , Mohamed Shaban , Fahad M. Alhomayani , Shirin Shomurotova , Mohammad Sediq Safi , Raymond Ghandour , Yasser Elmasry , Albara Ibrahim Alrawashdeh

As the global energy demand continues to rise, there is an urgent need to improve the efficiency and sustainability of power generation systems. This study integrated a modified supercritical carbon dioxide (S-CO₂) and multi-effect desalination (MED) units to recover residual heat from a gas turbine cycle (GTC) in two stages, significantly enhancing electricity production while reducing the environmental footprint of the GTC. The significance of this study lies in its comprehensive approach, combining thermodynamic, environmental, and thermoeconomic analyses alongside thorough sensitivity evaluations. A triple optimization framework was implemented to optimize the system's performance, focusing on key metrics such as exergy efficiency, CO₂ reduction rates, and levelized energy cost, utilizing the NSGA-II and the TOPSIS decision-making method in MATLAB software. Economic viability was assessed through a net present value (NPV) analysis, demonstrating substantial profitability. Finally, a comparison study of the devised system CO₂ emissions rate was performed for different renewable energy sources. A specific application of the devised system is its capacity to generate 1.415 m³/h of distilled water while generating 1441 kW of electricity. Sensitivity analysis identified the combustion chamber temperature as the most critical design parameter, with a sensitivity index of 0.328. The optimum economic indicators showed marked improvement, with the NPV increasing from 2.371 M$ to 10.75 M$ and the payback period decreasing from 13.28 years to 7.18 years.

随着全球能源需求的持续增长，迫切需要提高发电系统的效率和可持续性。本研究整合了改良型超临界二氧化碳（S-CO2）和多效脱盐（MED）装置，分两个阶段回收燃气轮机循环（GTC）中的余热，在减少 GTC 对环境影响的同时显著提高了发电量。这项研究的意义在于其综合方法，将热力学、环境和热经济分析与全面的敏感性评估相结合。利用 MATLAB 软件中的 NSGA-II 和 TOPSIS 决策方法，实施了三重优化框架来优化系统性能，重点关注放电效率、二氧化碳减排率和平准化能源成本等关键指标。通过净现值（NPV）分析，对经济可行性进行了评估，结果表明具有可观的盈利能力。最后，针对不同的可再生能源，对所设计系统的二氧化碳排放率进行了比较研究。所设计系统的一个具体应用是在发电 1441 千瓦的同时，还能产生 1.415 立方米/小时的蒸馏水。敏感性分析表明，燃烧室温度是最关键的设计参数，敏感性指数为 0.328。最佳经济指标明显改善，净现值从 237.1 万美元增至 1075 万美元，投资回收期从 13.28 年降至 7.18 年。

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引用次数: 0

Experimental analysis of intumescence fireproofing coating on base material of substation frames 变电站框架基材膨胀防火涂料的实验分析

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.csite.2024.105478

Jun Ji , Jingkai Nie , Hui Zhu , Yu Han , Hui Liu , Xiaoming Wang

In order to improve the fire resistance of the substation frame, an intumescence fireproof coating for the base material (Q235 steel and stainless steel) of substation frame was developed in this paper. The experiments of pull-out test, fire resistance test and electron microscope scanning were carried out to observe the mechanical properties, fire resistance properties and microphysical and chemical properties of the fireproof coating or base material. The main conclusions are summarized as follows: The bond strength of the Q235 steel to the intumescence fireproof coating is 1.26 MPa, which is greater than that of stainless steel at 0.506 MPa. Moreover, the variations of backside temperature and internal temperature of specimens with fireproofing coating are apparently different from those for conditions without fireproofing coating. For conditions with fireproofing coating, the backside temperature and internal temperature of specimens increase in the initial stage, while after the fireproofing coating is expanded and the insulation layer is formed on the surface, the rise rate of the temperature decreases. The average thermal insulation efficiencies of Q235 carbon steel and stainless steel are 240.32 min and 223.22 min, while the average values of fire resistance limit are 250.8 min and 244.2 min, respectively. The expansion multiples of the fireproofing coating for the two materials after being heated are between 50 and 60. Furthermore, the pull-out test would cause certain damage to the fireproof coating on the surface of steel components, and the damage to the Q235 steel sample was greater than that to the stainless steel sample. At the same time, the fireproof coating would undergo chemical reactions leading to expansion when heated, resulting in a dense surface and porous structure inside, which could reduce heat transfer to a certain extent.

为了提高变电站构架的耐火性能，本文开发了一种用于变电站构架基材（Q235 钢和不锈钢）的膨胀防火涂料。通过拉拔试验、耐火试验和电子显微镜扫描等实验，观察了防火涂层或基材的力学性能、耐火性能和微观物理化学性能。主要结论总结如下：Q235 钢与膨胀防火涂料的粘结强度为 1.26 兆帕，大于不锈钢的 0.506 兆帕。此外，涂有防火涂料的试样背面温度和内部温度的变化与未涂防火涂料的试样明显不同。在有防火涂层的条件下，试样的背面温度和内部温度在初始阶段会升高，而在防火涂层膨胀并在表面形成隔热层后，温度的升高速度会降低。Q235 碳钢和不锈钢的平均隔热效率分别为 240.32 min 和 223.22 min，耐火极限平均值分别为 250.8 min 和 244.2 min。两种材料的防火涂层在加热后的膨胀倍数介于 50 和 60 之间。此外，拉拔试验会对钢构件表面的防火涂层造成一定的破坏，Q235 钢样品的破坏程度大于不锈钢样品。同时，防火涂层在加热时会发生化学反应而膨胀，导致表面致密而内部多孔的结构，这在一定程度上会降低热量的传递。

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引用次数: 0

Analysis and testing of temperature adaptability of large-scale body-mounted radiator 大型车身散热器的温度适应性分析和测试

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.csite.2024.105476

Xingxing Huang , Shuncheng Zhang , Kang Han , Zhenyu Lu , Liang Guo , Ming Sun

This paper addresses the issue of thermal stress release in large-scale body-mounted radiator for China space station telescope under extreme temperature differences of 80 °C. To address this challenge, an innovative floating combined stress release support mechanism is proposed. Initially, the stress release mechanism for the radiator is designed with an “orthogonal + parallel” layout based on key factors such as radiator size, operating conditions, and thermal stress. Subsequently, through this layout design, specific modeling is conducted for the fixed support point, line-degree-of-freedom release mechanism, and plane-degree-of-freedom release mechanism of the stress release support mechanism. Utilizing elastic mechanics theory, the deformation of the radiator cooling panel is determined to be 2.51 mm, leading to the design of a support mechanism with a release capacity of 5 mm. Finally, the effectiveness of the design is verified through finite element simulation analysis and experimental validation. Thermal-elastic simulation analysis reveals that the strain of the radiator cooling panel under an 80 °C temperature load is 2.75 mm, representing an error of 8 % compared to the theoretical calculation. The maximum stress of 315 MPa in the radiator cooling panel and 873 MPa in the support mechanism are less than the yield strength of the respective materials. Experimental results indicate that during a temperature change of 30 °C, the lateral deformation of the radiator is 0.85 mm, differing by 17.48 % from the simulation analysis result of 1.03 mm for a ΔT of 30 °C. These errors fall within an acceptable range and meet the design requirements. The results strongly confirm that the designed stress release support mechanism can effectively release thermal stress in large-scale body-mounted radiator while ensuring that the deformation of the radiator remains within the safe range of the sliding distance of the stress release support mechanism.

本文探讨了中国空间站望远镜大型体安装散热器在 80 ℃ 极端温差下的热应力释放问题。为解决这一难题，本文提出了一种创新的浮动组合应力释放支撑机构。首先，根据散热器尺寸、工作条件和热应力等关键因素，设计了 "正交 + 平行 "布局的散热器应力释放机构。随后，通过布局设计，对应力释放支撑机构的固定支撑点、线自由度释放机构和平面自由度释放机构进行了具体建模。利用弹性力学理论，确定散热器冷却板的变形量为 2.51 毫米，从而设计出释放能力为 5 毫米的支撑机构。最后，通过有限元模拟分析和实验验证了设计的有效性。热弹性模拟分析表明，散热器冷却板在 80 °C 温度负载下的应变为 2.75 毫米，与理论计算结果相比误差为 8%。散热器冷却板的最大应力为 315 兆帕，支撑机构的最大应力为 873 兆帕，均小于相应材料的屈服强度。实验结果表明，在温度变化 30 °C 时，散热器的横向变形为 0.85 mm，与模拟分析结果（ΔT 为 30 °C 时为 1.03 mm）相差 17.48 %。这些误差在可接受范围内，符合设计要求。这些结果有力地证实了所设计的应力释放支撑机构能够有效释放大型车身安装散热器的热应力，同时确保散热器的变形保持在应力释放支撑机构滑动距离的安全范围内。

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引用次数: 0

Thermodynamic and economic analysis of ocean thermal energy conversion system using zeotropic mixtures 使用各向同性混合物的海洋热能转换系统的热力学和经济分析

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.csite.2024.105408

Yanmei Zhang , Jiawei Deng , Zilong Deng

Zeotropic mixtures offer a promising strategy for enhancing the thermodynamic efficiency and economic feasibility of ocean thermal energy conversion (OTEC) systems. This study investigates two binary mixtures containing R32: R32/R125 and R32/R134a. Through the development of comprehensive thermodynamic and economic models, the research examines the impact of mass fraction and evaporation temperature on the efficiency and cost-effectiveness of the OTEC system. The results indicate that, especially at high evaporation temperatures, the R32/R134a mixture—characterized by significant temperature glide—substantially increases the total energy production capacity of the OTEC system. Compared to pure R32, the OTEC with R32/R134a (mass fraction of R32 is 0.55) has a net output power increase of 9.87 kW and a reduction in LCOE of about 61.4 %. In addition, the advantages of R32/R125 mixtures over pure working fluids are not significant due to the small glide temperature. Ultimately, this investigation enhances the overall performance of OTEC systems, thereby supporting sustainable energy solutions for island communities.

各向同性混合物为提高海洋热能转换（OTEC）系统的热力学效率和经济可行性提供了一种前景广阔的策略。本研究调查了两种含有 R32 的二元混合物：R32/R125 和 R32/R134a。通过开发综合热力学和经济模型，研究探讨了质量分数和蒸发温度对 OTEC 系统效率和成本效益的影响。研究结果表明，特别是在高蒸发温度下，R32/R134a 混合物具有显著的温度滑动特性，可大幅提高 OTEC 系统的总能源生产能力。与纯 R32 相比，使用 R32/R134a 的 OTEC（R32 的质量分数为 0.55）净输出功率增加了 9.87 千瓦，LCOE 降低了约 61.4%。此外，由于滑行温度较低，R32/R125 混合物与纯工作液相比优势并不显著。最终，这项研究提高了 OTEC 系统的整体性能，从而为岛屿社区的可持续能源解决方案提供了支持。

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引用次数: 0

Investigation of thermodynamics performance of a heat exchanger-incorporated solar dryer equipped with double-pass flat, v-corrugated, and low-e coated collectors for drying applications 用于干燥应用的装有双通道平板、V 型波纹和低辐射涂层集热器的热交换器太阳能干燥器的热力学性能研究

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-12 DOI: 10.1016/j.csite.2024.105482

Ananta Aacharya , Henrik Davidsson , Bivek Baral , Martin Andersson

In this study, a solar dryer incorporating a flat plate heat exchanger to recover heat from exhaust air was investigated to explore the usability of different types of collectors in the system. Their usability was further evaluated through economic and environmental analyses. Moreover, the thermodynamic performance of the solar dryers was evaluated under two weather conditions in Nepal. Apple drying experiments were conducted for 8 h from 09:00 to 17:00 from February to April 2023 on solar dryers and with open sun drying (OSD) in Dhulikhel, Nepal. The results showed that the low emissivity (low-e) coated aluminum collector was more efficient in terms of collector efficiency and drying rate than collectors with flat or v-corrugated GI absorbers. The average collector efficiency and drying rate were found to be 89 % and 107 g/(h × m²) using the low-e coated aluminum collectors, while the values were 50 % and 84 g/(h × m²) for the GI sheet collector. The results indicated a slight improvement in the performance of v-corrugated collectors, with values of 53 % and 89 g/(h × m²). The drying rate for OSD was found to be 78 g/(h × m²), which was lower than for the dryers with all collectors used in this study. In terms of economic analysis, the dryer equipped with the low-e coated collector was found to be superior, with a payback time of 1.61 years compared to the dryers with flat or v-corrugated GI collectors. Reducing the thermal losses due to radiation by using the low-e coated absorber was shown to be more important than increasing the absorber area using v-corrugated GI sheets.

在这项研究中，我们调查了一种太阳能干燥器，该干燥器采用平板热交换器从废气中回收热量，以探索系统中不同类型集热器的可用性。通过经济和环境分析，进一步评估了它们的可用性。此外，还在尼泊尔的两种天气条件下对太阳能干燥器的热力学性能进行了评估。2023 年 2 月至 4 月，在尼泊尔 Dhulikhel 的太阳能烘干机和露天日晒（OSD）上进行了 8 小时（9:00 至 17:00）的苹果烘干实验。结果表明，就集热器效率和干燥速率而言，涂有低辐射率（low-e）涂层的铝制集热器比带有平面或 V 形波纹 GI 吸收器的集热器更有效。使用低辐射铝涂层集热器的平均集热器效率和干燥率分别为 89 % 和 107 g/(h × m2)，而使用 GI 片材集热器的平均集热器效率和干燥率分别为 50 % 和 84 g/(h × m2)。结果表明，V 型波纹集热器的性能略有提高，其值分别为 53 % 和 89 g/(h × m2)。OSD 的干燥速率为 78 g/（h × m2），低于本研究中使用的所有集热器的干燥机。在经济分析方面，配备低辐射涂层集热器的烘干机比配备平面或 V 型波纹 GI 集热器的烘干机更优越，投资回收期为 1.61 年。使用低辐射涂层吸收器减少辐射造成的热损失比使用 V 形波纹 GI 板增加吸收器面积更重要。

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引用次数: 0

Influence on the efficiency of liquid CO2-ECBM under the different pressure and temperature levels: From experimental to in-situ test 不同压力和温度水平对液态 CO2-ECBM 效率的影响：从实验到现场测试

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-10 DOI: 10.1016/j.csite.2024.105477

Gaoming Wei , Li Ma , Xin Yi , Hu Wen , Shangming Liu , Ruizhi Guo

This study focuses on the efficiency of liquid CO₂ (LCO₂) displacing CH₄ in the coal under optimal T_i and P_i. The objective is to study the influence on the efficiency of LCO₂ injection to displace CH₄ under the different temperature (T_i) and pressure (P_i). Thereafter, an in-situ test is conducted on LCO₂ injecting to enhance coalbed methane (LCO₂-ECBM) in a high-gas coalbed. Results showed that low temperature inhibited the movement activity of CO₂/CH₄ in coal, a significant delayed effect is exhibited during CO₂ displacing CH₄, and the maximum displacement efficiency (η_max) is only 56.02 %. The competitive-adsorption effect of CO₂/CH₄ intensified, and η_max increased to 84.13 % as T_i gradually increased. The CH₄ desorption rate and migration dynamics in the coal intensified as P_i increased, resulting in a significant increase in efficiency, and η_max reached 92.87 %. At 30 °C, where CH₄ is present in the coal, an appropriate increase in P_i caused the maximum replacement ratio to decrease from 1.60:1 to 0.40:1, indicating a higher efficiency. An In-situ test of LCO₂-ECBM showed that the concentration and flow rate of methane increased by nearly three times, and the CBM extraction time and borehole layout number have been shortened by one-third and half, respectively.

本研究的重点是在最佳 Ti 和 Pi 条件下液态 CO2（LCO2）置换煤中 CH4 的效率。目的是研究在不同温度（Ti）和压力（Pi）条件下，液态二氧化碳注入对置换煤中 CH4 的效率的影响。随后，在高瓦斯煤层中进行了注入 LCO2 提高煤层气（LCO2-ECBM）的现场试验。结果表明，低温抑制了煤中 CO2/CH4 的运动活性，在 CO2 置换 CH4 的过程中表现出明显的延迟效应，最大置换效率（ηmax）仅为 56.02%。随着 Ti 的逐渐增加，CO2/CH4 的竞争吸附效应增强，ηmax 提高到 84.13 %。随着 Pi 的增加，煤中 CH4 的解吸速率和迁移动力学增强，导致效率显著提高，ηmax 达到 92.87 %。在 30 °C 时，煤中存在 CH4，适当增加 Pi 会使最大置换比从 1.60:1 降至 0.40:1，表明效率更高。LCO2-ECBM 的原位测试表明，煤层气的浓度和流速提高了近三倍，煤层气抽采时间和井眼布置数量分别缩短了三分之一和一半。

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引用次数: 0

Order degree and centrality analysis of advanced fighter environmental control system and thermal management system 先进战斗机环境控制系统和热管理系统的有序度和中心性分析

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-10 DOI: 10.1016/j.csite.2024.105486

Junyuan Liao, Chunxin Yang, Han Yang

As fighter aircraft become more advanced, traditional air cycle systems have fallen short of meeting the complex environmental control requirements. Advanced fighters such as the F-22 Raptor have responded to these challenges by adopting integrated thermal management systems. These systems feature complex thermodynamic processes and intricate information transmission pathways among various components, creating a sophisticated network structure. To unravel the complexity of such systems, this paper employs a blend of thermodynamics and information theory. We conduct multi-level analysis using structure entropy method and centrality algorithms to explore the information transmission characteristics within these thermodynamic systems. At the system level, we find that variation in environmental parameters have only a 1 % impact on order degree, whereas the influence from the system's own structure is more pronounced. At the component level, within the whole system, the varies components in AFT PAO and fuel loops emerge as critical hubs for information transmission. Among these components, the PAO/Fuel stands out as the most important, with closeness and betweenness centrality exceeding that of all other components by at least 11.5 % and 29.1 %. This study offers a theoretical foundation for the optimization of thermodynamic system structure and layout, viewed through the lens of information theory.

随着战斗机越来越先进，传统的空气循环系统已无法满足复杂的环境控制要求。为了应对这些挑战，F-22 "猛禽 "等先进战斗机采用了集成热管理系统。这些系统具有复杂的热力学过程，各部件之间的信息传输路径错综复杂，形成了复杂的网络结构。为了揭示此类系统的复杂性，本文采用了热力学和信息论相结合的方法。我们利用结构熵法和中心度算法进行多层次分析，探索这些热力学系统内部的信息传输特征。在系统层面，我们发现环境参数的变化对秩度的影响仅为 1%，而系统自身结构的影响更为明显。在组件层面，在整个系统中，AFT PAO 和燃料回路中的各种组件成为信息传递的关键枢纽。在这些组件中，聚α烯烃/燃料是最重要的，其接近度和中心度分别比其他组件高出至少 11.5 % 和 29.1 %。这项研究从信息论的角度为优化热力学系统结构和布局提供了理论基础。

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引用次数: 0

A comprehensive analysis on thermally enhanced electro-magneto-hydrodynamic micropolar flow mixture comprising water (70 %) and ethylene-glycol (30 %) with alumina nanoparticles over a riga plate 对水（70%）和乙二醇（30%）与氧化铝纳米颗粒在里加板上形成的热增强型电磁流体力学微极性流动混合物的综合分析

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering

Pub Date : 2024-11-10 DOI: 10.1016/j.csite.2024.105471

Ahmed M. Galal , Jihad Younis , Laila A. AL-Essa , Ali M. Mahnashi , Waleed Hamali , Anwar Saeed

In this research paper, a two-dimensional flow of an electro-magneto-hydrodynamic water-ethylene glycol-based nanofluid over a Riga plate has been presented. The nanofluid mixture has micropolar and electrical behaviors. Furthermore, the effects of chemical reaction and activation energy are imposed in the present investigation. It is important to mention that the nanofluid mixture is composed of alumina nanoparticles (Al₂O₃) and base fluid as water-ethylene glycol (70:30). It is important to mention that the significance of this study lies in engineering cooling systems, drug delivery, and microfluidic devices. The main equations of problem have converted to dimension-free form using similarity variables. The transformed ODEs are then converted into first-order differential equations and solved numerically by executing the shooting method. The validation on the modeled equations is confirmed by validating the present analysis with the results available literature. From this analysis, it is obtained that the greater micropolar parameter and modified Hartmann number enhanced the streamwise velocity profile while reducing micro-rotational velocity. The greater micro-gyration constraint reduced streamwise velocity profile while enhancing micro-rotational velocity. The greater thermophoresis factor and thermal Biot number enhanced both thermal and concentration profiles. The greater activation energy factor enhanced the concentration distribution, and the greater Brownian motion factor and Schmit number reduced the concentration distribution. The higher thermophoresis factor reduced the heat transfer rate, and the higher heat source factor and thermal Biot number enhanced heat transfer rate.

在这篇研究论文中，介绍了一种基于水-乙二醇的电磁流体在里加板上的二维流动。该纳米流体混合物具有微极性和电学行为。此外，本研究还考虑了化学反应和活化能的影响。值得一提的是，纳米流体混合物由氧化铝纳米颗粒（Al2O3）和水-乙二醇（70:30）基液组成。值得一提的是，这项研究对工程冷却系统、药物输送和微流体设备具有重要意义。利用相似变量将问题的主要方程转换为无量纲形式。然后，将转换后的 ODE 转换为一阶微分方程，并通过射击法进行数值求解。通过将本分析与现有文献结果进行验证，确认了模型方程的有效性。分析结果表明，增大微极参数和修改哈特曼数可增强流向速度曲线，同时降低微旋转速度。微气孔约束条件越大，流向速度剖面越小，而微旋转速度却越大。热泳系数和热毕奥特数越大，热剖面和浓度剖面越好。活化能因子越大，浓度分布越大，而布朗运动因子和施密特数越大，浓度分布越小。热泳系数越大，传热速率越低；热源系数和热毕奥特数越大，传热速率越高。

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引用次数: 0