Results in Engineering最新文献

{"title":"A review of the engineered treatment of red mud: Construction materials, metal recovery, and soilization revegetation","authors":"Kai Jia ,&nbsp;Zhenxing Zhou ,&nbsp;Shiv Vendra Singh ,&nbsp;Chongqing Wang","doi":"10.1016/j.rineng.2024.102927","DOIUrl":"10.1016/j.rineng.2024.102927","url":null,"abstract":"<div><p>Red mud, known as bauxite residue, is an alkaline solid waste generated during alumina production. Globally, the stockpile of red mud is about 3 billion tons and is increasing at a rate of 150 million tons per year. The global production of red mud is mainly distributed in China (28.2 %), Oceania region (22.4 %), South America (14.6 %), Europe (12.9 %), and North America (8.8 %). The increasing stockpile of red mud has posed a huge challenge to safe disposal while restricting the development of the alumina industry. The comprehensive utilization of red mud still needs green, efficient, and massive consumption methods. This work gives a review of the engineered treatment of red mud, including the characteristics and threats, as well as the engineered application through construction materials, metal recovery, and soilization revegetation. For red mud with a high content of metals, resource recovery of valuable metals and rare earth elements is a preferred choice, meeting the circular economy concept. Recovery of valuable metals from red mud can be achieved by magnetic separation, hydrometallurgy, and bioleaching. Hydrometallurgy is promising for recovering valuable metals such as Fe, Al, V, Ti, and rare earth elements, and the recovery is up to 99 %. Construction materials such as cement, geopolymers, and ceramics is an efficient alternative for the massive consumption of red mud, and the high-performance concrete with the compressive strength (129.5 MPa) can be obtained. This strategy is limited by the low price of construction materials, the lowered quality by alkaline components, and potential threats of toxic elements in red mud. Soilization of red mud with ecological restoration is promising for the sustainable management of red mud dam. To accelerate the process of red mud soilization, amendments such as gypsum, organic matter, and microorganisms can be added to neutralize red mud (lowering pH from 10 to 12 to near 7), promote the formation of agglomerates, and provide nutrients, promote the conversion of red mud into soil-like substrate. The phytoremediation of red mud can be realized after effective regulation, finally realizing vegetation establishment of red mud. This work provides technological and practical guidance for the engineered disposal of red mud.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102927"},"PeriodicalIF":6.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011824/pdfft?md5=8d71d73fc2433013393c502d271512be&pid=1-s2.0-S2590123024011824-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Budget allocation problem for projects with considering risks, robustness, resiliency, and sustainability requirements","authors":"Reza Lotfi ,&nbsp;Masoud Vaseei ,&nbsp;Sadia Samar Ali ,&nbsp;Sayyed Mohammad Reza Davoodi ,&nbsp;Mansour Bazregar ,&nbsp;Soheila Sadeghi","doi":"10.1016/j.rineng.2024.102828","DOIUrl":"10.1016/j.rineng.2024.102828","url":null,"abstract":"<div><p>Budget Allocation Problem (BAP) for projects is considered one of the critical risks that necessitate the completion of projects in the shortest possible duration. This aspect is significant in extensive projects such as national endeavors directly impacting people's livelihoods. This research focuses on introducing Sustainable, Robust, Resilient, and Risk-averse Budget Allocation for Projects (S3RBAP). A hybrid robust stochastic optimization approach was employed, incorporating Weighted VaR (WVaR) and the minimum function as risk criteria to ensure the robustness of the objective function. This model is designed to minimize the weighted expected value, WVaR, and the minimum progress function, thereby promoting the 3R and sustainability framework to tackle budget fluctuations and enhance project viability. The case study revolves around the construction of national projects in Iran. Ultimately, the project's required budget was allocated within the budgetary constraints. Sensitivity analysis found that the integration of 3R and sustainability led to a 13.5 % reduction in the progress function compared to scenarios without these principles. Furthermore, increasing the conservatism coefficient to 20 % decreased the progress function to −0.58 %. Reducing the resiliency coefficient had an adverse effect by disrupting the budget allocation process. The computational time is increased gradually with the escalation of problem complexity, while the progress function decreases due to the increased number of projects. The findings demonstrate that using an exponential function promotes risk aversion, whereas a sine function encourages risk-seeking behaviour within this research context.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102828"},"PeriodicalIF":6.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024010831/pdfft?md5=2c6250222d6e0cdfcd43299b5893c9cc&pid=1-s2.0-S2590123024010831-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative life cycle assessment of hospital waste management scenarios in Isfahan, Iran: Evaluating environmental impacts and strategies for improved healthcare sustainability","authors":"Hossein Nematollahi,&nbsp;Reza Ghasemzadeh,&nbsp;Maryam Tuysserkani,&nbsp;Mohamadmahdi Aziminezhad,&nbsp;Maryam Pazoki","doi":"10.1016/j.rineng.2024.102912","DOIUrl":"10.1016/j.rineng.2024.102912","url":null,"abstract":"<div><p>This study presents a life cycle assessment (LCA) of hospital waste management scenarios in Isfahan, Iran. Daily hospital waste generation totals 20 tons, with 44 % infectious and 56 % non-infectious waste. The non-infectious stream comprises 40 % food waste. Pyrolysis, chemical disinfection, composting, and material recovery were evaluated across ten environmental impact categories using TRACI 2014 methodology. Composting and material recovery reduce smog-forming emissions by 126.79 kg O₃ eq/ton and 129.02 kg O₃ eq/ton, respectively, and fossil fuel depletion by 255.04 MJ surplus/ton and 471.97 MJ surplus/ton compared to incineration. Chemical disinfection of infectious waste shows lower global warming potential (859.89 kg CO₂ eq/ton) than pyrolysis (1483.15 kg CO₂ eq/ton). The third scenario, prioritizing composting and material recovery, minimizes ecotoxicity with lowest emissions of cadmium (0.33 g/ton) and nickel (16.23 g/ton) to air, and arsenic (0.003 g/ton) and chromium (0.28 g/ton) to water. This study addresses a rarely assessed system in LCA literature, offering valuable insights for improving waste management in similar contexts worldwide. Recommendations include developing regulatory frameworks, investing in infrastructure, promoting collaboration, implementing training programs, and adopting circular economy principles. The research contributes to building life cycle thinking capability within the Iranian healthcare sector through stakeholder engagement, workshops, and public dissemination of findings.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102912"},"PeriodicalIF":6.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011678/pdfft?md5=5bd366e8ce8a202da225c3652bc2d1da&pid=1-s2.0-S2590123024011678-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Functional interface layer for a high-performance self-rectifying memristive device using hafnium-zirconia thin film","authors":"Se Yeon Jeong ,&nbsp;Jaeho Jung ,&nbsp;Hyun Kyu Seo ,&nbsp;Jae-Seung Jeong ,&nbsp;June Hyuk Lee ,&nbsp;Gun Hwan Kim ,&nbsp;Min Kyu Yang","doi":"10.1016/j.rineng.2024.102906","DOIUrl":"10.1016/j.rineng.2024.102906","url":null,"abstract":"<div><div>With the accelerated development of artificial intelligence-oriented hardware components, research on low-power, high-density memory devices is actively being conducted. Among various memory devices, resistive switching devices with crossbar structures have been extensively researched owing to their many advantages. To address the sneak current issue that is inherent in memory devices with crossbar structures, additional selection devices have been considered. However, self-rectifying resistive switching devices are known to be advantageous for harnessing structural benefits. Although significant research has been conducted in this area and remarkable results have been published, further research is required to improve the electrical characteristics for low-power, high-density memory applications This paper introduces self-rectifying devices with low power consumption, high rectification ratios, and high reliability. By combining HfZrO_x resistance-change layers and SiO_x interlayers, the characteristics of self-rectifying devices were confirmed, achieving a rectification ratio of 10⁶ and 100 % operational yield in 1 kb crossbar devices. The essential multiply-and-accumulate operations in artificial intelligence-oriented hardware components were verified, and the applicability of the device as an artificial neural network was explored through simulations.</div></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102906"},"PeriodicalIF":6.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011617/pdfft?md5=782087eb819f4907ed70c7f3303ed26f&pid=1-s2.0-S2590123024011617-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of novel selenium nanohybrid for biotechnology and risk assessment of multi-drug resistance bacteria","authors":"Sana MH. Al-Shimmary ,&nbsp;Amina N. Al-Thwani","doi":"10.1016/j.rineng.2024.102910","DOIUrl":"10.1016/j.rineng.2024.102910","url":null,"abstract":"<div><p>Relatively recently, the significance of nanomaterials in several domains like materials science, chemistry, and biology has increased dramatically. Selenium is a vital trace element of enormous importance involved in electronics, sensors, catalysis, optics, and biological applications. The study's objective was to synthesize an enterocin conjugate with selenium nanoparticles to form a nanohybrid system that may increase the bioactivity of enterocin and overcome these hurdles. The nanohybrid system was characterized using the use of UV–vis, FTIR, XRD, EDX, TEM, Zeta potential and SEM. This system was used to health one risk assessment multi-drug resistance bacteria. The designed nanohybrid system showed high ability to growth inhibition of all these bacteria. As a result, the nanohybrid showed strong antibacterial activity against MDR bacteria using several accepted techniques. The biocidal effects of nanohybrid on tested bacteria was investigated using SEM. Upon examination, the results revealed damage, blebs, fusion, clumping, and uneven distribution in the cell wall of the tested bacteria, ultimately leading to cell death. The results showed that the system is good engineering design to kill bacteria. In addition, compared with bacteriocin alone, the nanohybrid showed promising antioxidant activity in vitro.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102910"},"PeriodicalIF":6.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011654/pdfft?md5=7e7179839265ded826b790d2b3eb5881&pid=1-s2.0-S2590123024011654-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of blended winglet parameters on the aerodynamic characteristics of NXXX aircraft using Computational Fluid Dynamics (CFD)","authors":"M.S.K Tony Suryo Utomo ,&nbsp;Eflita Yohana ,&nbsp;Calvin Mahendra ,&nbsp;Ignatius Yudki Utama","doi":"10.1016/j.rineng.2024.102901","DOIUrl":"10.1016/j.rineng.2024.102901","url":null,"abstract":"<div><p>Winglet is a wingtip device that was developed to improve aircraft flight performance by reducing induced drag. The induced drag produced by the NXXX aircraft is considered too excessive because the simple wingtip currently available is still not optimal in reducing induced drag, so a new more optimal wingtip is needed. This research aims to analyze the influence of blended winglet parameters on the aerodynamic characteristics of the NXXX aircraft such as <span><math><mrow><msub><mi>C</mi><mi>L</mi></msub></mrow></math></span> and <span><math><mrow><msub><mi>C</mi><mi>D</mi></msub></mrow></math></span>. Not only that, pitch moment coefficient (<span><math><mrow><msub><mi>C</mi><mi>M</mi></msub></mrow></math></span>) is also studied to determine how trim drag can increase with the consequent increase of aerodynamic efficiency (<span><math><mrow><msub><mi>C</mi><mi>L</mi></msub></mrow></math></span>/ <span><math><mrow><msub><mi>C</mi><mi>D</mi></msub></mrow></math></span>) which currently has not been specifically researched yet. Winglet parameters in this study include variations in taper ratio, winglet height, cant angle, trailing edge sweep, and blending radius that there is not enough analysis about it now. Computational Fluid Dynamics (CFD) simulation uses Ansys CFX with the Shear Stress Transport (SST) turbulence model is used to obtain wing aerodynamic data. This research concludes that the best winglet configuration is taper ratio of 0.2, blending radius of 15 %, winglet height of 30 %, cant angle of 15°, and trailing edge sweep of −0.6°. Apart from that, it was also found that all winglet configurations increased <span><math><mrow><msub><mi>C</mi><mi>L</mi></msub></mrow></math></span>, <span><math><mrow><msub><msub><mi>C</mi><mi>L</mi></msub><mi>max</mi></msub></mrow></math></span>, and also lift slope (<span><math><mrow><mi>a</mi></mrow></math></span>). Almost all winglets also reduce the critical angle of attack, reduce <span><math><mrow><msub><mi>C</mi><mi>D</mi></msub></mrow></math></span>, and increase <span><math><mrow><msub><mi>C</mi><mi>M</mi></msub></mrow></math></span>. This simulation finds that addition of blended winglet can increase aerodynamic efficiency up to 17.51 % in cruise condition using the variation of winglet height.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102901"},"PeriodicalIF":6.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011563/pdfft?md5=0f7fa6e3db7142adf23346acdb9b3e15&pid=1-s2.0-S2590123024011563-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computational work of casson rheology on 3D swirling plate employing yamada-ota and xue models","authors":"Jabr Aljedani ,&nbsp;Hakim AL Garalleh ,&nbsp;Umar Nazir ,&nbsp;Muhammad Sohail ,&nbsp;Ibrahim Mahariq ,&nbsp;Abd Allah A. Mousa ,&nbsp;Afnan Al Agha","doi":"10.1016/j.rineng.2024.102876","DOIUrl":"10.1016/j.rineng.2024.102876","url":null,"abstract":"<div><p>This article emphasizes the findings of comparative thermal enhancement in Casson fluid using bases fluid as blood and Xue and Yamada-Ota hybrid nano-structures model towards a 3D swirling plate. Nanofluid flow is a widely investigated topic in engineering and industry, particularly in the cooling of electronic devices. Its proven ability to save energy makes it a viable option for improving cooling systems and sustainability initiatives. Thermal energy incorporates solar radiation, Soret and heat sources while transportation of species happens utilizing activation energy and Dufour impact. It was estimated that the system (partial differential equation) is converted into Odes employing finite element methodology. Such a complicated model is resolved efficient method named as finite element method. By enhancing impacts of chemical reaction and Dufour numbers, mass diffusion is enhanced but opposite behavior is noticed in mass diffusion with the change of Schmidt number. By increasing values of Lorentz force and velocity field inclines. Further, thickness (MBLs) increase with variation of Lorentz force and Casson parameter.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102876"},"PeriodicalIF":6.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011319/pdfft?md5=53620a4a1be64df773311bdd66d60edf&pid=1-s2.0-S2590123024011319-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of highly efficient filtering power amplifier with a wideband response for sub-6 GHz 5G applications","authors":"Mohamed Boumalkha ,&nbsp;Mohammed Lahsaini ,&nbsp;Moulay El Hassane Archidi ,&nbsp;Mahmoud F. Ghareeb ,&nbsp;Ahmed S.I. Amar ,&nbsp;Eyad S. Oda ,&nbsp;Sherif F. Nafea","doi":"10.1016/j.rineng.2024.102905","DOIUrl":"10.1016/j.rineng.2024.102905","url":null,"abstract":"<div><p>This paper presents the design of a filtering power amplifier (PA) with extra-high power-efficiency and wide bandwidth. To accomplish this, a novel approach is adopted by utilizing a wideband bandpass filter (BPF) as the output matching network (OMN) for the PA. The BPF compromises two paths, where each path consisting of two identical coupled lines that are interconnected to form a ring structure. The suggested configuration eliminates the need for a conventional OMN by integrating the input port of the filter with the drain node of the transistor, resulting in reduced size and losses and improved amplifier performance. The filter concept is illustrated using coupling matrix synthesis. A proof-of-concept filtering PA has been designed using a commercially available 10 W GaN HEMT. This amplifier was designed to operate in the frequency range of 3.0–5.0 GHz, yielding a fractional bandwidth of 50 %. According to achieved results, the drain efficiency and output power are 43.8–70.5 % and 40.2–41.8 dBm, respectively. As a result, the suggested filtering PA demonstrates significant performance in terms of filter bandwidth response and power amplification. Additionally, the proposed filtering PA has a broad operational bandwidth of 3.0–5.0 GHz, which covers the 5G New Radio (NR) n77 (3.3–4.2 GHz), n78 (3.3–3.8 GHz), and n79 (4.4–5.0 GHz) frequency bands.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102905"},"PeriodicalIF":6.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011605/pdfft?md5=7658c14c4283f4db4df4ee68900b7962&pid=1-s2.0-S2590123024011605-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation on performance of bubble-bursting atomization methods for minimum quantity lubrication in face milling tool steel","authors":"Muhammad Rizal ,&nbsp;Amir Zaki Mubarak ,&nbsp;Jaharah A. Ghani","doi":"10.1016/j.rineng.2024.102903","DOIUrl":"10.1016/j.rineng.2024.102903","url":null,"abstract":"<div><p>The metal cutting industry faces challenges in machining hard materials due to high forces and temperatures. This paper introduces bubble-bursting atomization minimum quantity lubrication (BBA-MQL), a novel MQL technique that generates fine biodegradable oil mists for cooling and lubrication. Although the initial results of BBA-MQL are promising, there has not been a comprehensive investigation into its use in machining hard materials, specifically tool steels. Therefore, this study focused on the applicability of BBA-MQL in face milling of AISI P20 + Ni tool steel in comparison with dry cutting and conventional MQL using commercial and vegetable oil. The machining tests were performed at three cutting speeds (50, 80, and 110 m/min), fixed cutting depth (0.2 mm), and feed rate (0.15 mm/tooth). The performance is evaluated by measuring the cutting force, surface quality, cutting temperature, and tool wear. It was found that BBA-MQL decreased cutting force and surface roughness considerably, with the average reductions being 23.2 % and 49.8 % compared with the conventional minimum quantity lubrication. The highest cutting speed of 110 m/min was preferred for achieving the lowest roughness value and cutting force when milling tool steel P20 + Ni. Furthermore, BBA-MQL with castor oil proved more effective compared to conventional MQL in reducing cutting force, showing improved surface finish, reduced cutting temperature, and delayed tool wear.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102903"},"PeriodicalIF":6.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011587/pdfft?md5=e6f9d3ca427ddbe28d349fd69ce551fd&pid=1-s2.0-S2590123024011587-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of synergistic effects of magnetic fields and bluff bodies on heat transfer enhancement and pressure drop reduction in microchannels","authors":"Shohreh Jalali,&nbsp;Ebrahim Barati,&nbsp;Mahdi Farkhondeh Kalat","doi":"10.1016/j.rineng.2024.102894","DOIUrl":"10.1016/j.rineng.2024.102894","url":null,"abstract":"<div><p>Efficient thermal management is essential for designing compact and high-performance heat sinks and heat exchangers. This study addresses the challenge of optimizing heat transfer while minimizing pressure losses in systems exposed to concentrated heat flux by proposing a novel approach that employs both active and passive vortex generators. Specifically, a uniform magnetic field generated by permanent magnets and a bluff body are utilized within a microchannel containing a 2 vol% ferrofluid. Numerical simulations were performed across Reynolds numbers ranging from 100 to 500 and magnetic field intensities up to 0.5 T to evaluate the system's performance. The results demonstrate that the combination of magnetic fields and a bluff body induces vortex generation, alters velocity distribution, and enhances flow mixing, resulting in a 30 % increase in heat transfer efficiency and an 11 % reduction in pressure drop under optimal conditions. Although the introduction of barriers led to a 3 % rise in pressure drop, the uniform magnetic field effectively mitigated friction by reducing flow separation and limiting surface contact. These findings highlight the potential of this method for improving the design of advanced thermal management systems.</p></div>","PeriodicalId":36919,"journal":{"name":"Results in Engineering","volume":"24 ","pages":"Article 102894"},"PeriodicalIF":6.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590123024011496/pdfft?md5=32a50fb2bdef3fdb8e4b1455c77d5759&pid=1-s2.0-S2590123024011496-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}