Sharif University of TechnologyScientia Iranica1026-3098321120260501Dynamical properties of nonlinear oscillators by the variational iteration method2411210.24200/sci.2024.61682.7439ENJamil AbbasHaiderAbdus Salam School of Mathematical Sciences, Government College University, Lahore 54600, Pakistan.ShahbazAhmadAbdus Salam School of Mathematical Sciences, Government College University, Lahore 54600, Pakistan.SohailNadeemDepartment of Mathematics, Quaid-I-Azam University, Islamabad, Pakistan.Department of Mathematics, Wenzhou University, Wenzhou, People’s Republic of China.0000-0002-1052-011XJournal Article20221230This article introduces a semi-analytical approach to solving equations that model blood flow in flexible vessels. The method, called the Variational Iteration Method with Laplace transformation (LVIM), is utilized to obtain an explicit solution. The problem is addressed by asymptotically reducing the incompressible Navier–Stokes equations, resulting in a one-dimensional nonlocal blood flow model that includes source terms. One of the most important steps is the evolution of the Lagrange Multiplier, which is calculated based on Lagrange theory. To showcase the effectiveness of LVIM, numerical examples based on experimentally determined parameters are provided. The model’s results are then assessed by comparing them and analyzing the relative error.https://scientiairanica.sharif.edu/article_24112_4e6919cccdf48de7acf7cb7e45c4065c.pdfSharif University of TechnologyScientia Iranica1026-3098321120260501Investigation of the combined use of diesel and CNG fuels on an HCCI engine using Response Surface Methodology (RSM)2412910.24200/sci.2024.61671.7433ENOğuz KürşatDemirciVocational High School, Erzincan Binali Yıldırım University, Erzincan, Turkiye.CanÇınarDepartment of Automotive Engineering, Faculty of Technology, Gazi University, Ankara, Turkiye.TolgaKocakulakTechnical Sciences of High Vocational School, Burdur Mehmet Akif Ersoy University, Burdur, Turkiye.Journal Article20221229In this study, the effects of the combined use of diesel and Compressed Natural Gas (CNG) fuels on the performance, combustion and emissions were experimentally and statistically investigated in a Homogeneous Charged Compression Ignition (HCCI) engine. Diesel and CNG fuels were used at different ratios between 0% and 80% by mass, and tests were conducted at different engine loads. The experimental procedure was designed using the Response Surface Methodology (RSM) composite central design method. The experimental data were analyzed using MATLAB and entered into the RSM. In order to determine the response parameters predictably, model equations were created, counter graphs were drawn and optimization was carried out. Engine load and CNG ratio, which are the optimum input parameters, were determined as 68.36% and 2.864%, respectively. The response parameter values were obtained as 4.487 bar for Indicated Mean Effective Pressure (IMEP), 39.3% for Indicated Thermal Efficiency (ITE), 255.5 g/kWh for Brake Specific Fuel Consumption (BSFC), 3.343% for Coefficient of Variation of Indicated Mean Effective Pressure (COVIMEP), 0.247% for CO, 191.566 ppm for HC, 579.538 ppm for NOx and 1.393 m-1 for smoke. This study, in which a combined diesel and CNG fueled engine operating in HCCI combustion mode is examined with experimental and statistical methods, will fill an important gap in the literature and provide researchers with a new perspective.https://scientiairanica.sharif.edu/article_24129_ce0724e35c8ec74b446c631c3503e2c8.pdfSharif University of TechnologyScientia Iranica1026-3098321120260501Enhancing performance and reducing emissions of a spark ignition engine by adding dimethyl carbonate to gasoline2413010.24200/sci.2024.61489.7337ENGopinathDhamodaranCentre for Sustainable Energy Technologies, Easwari Engineering College, Chennai, India.Ganapathy SundaramEsakkimuthuCentre for Sustainable Energy Technologies, Easwari Engineering College, Chennai, India.ThennarasuPalaniDepartment of Automobile Engineering, Velammal Engineering College, Chennai, India.SekarSubramaniDepartment of Mechanical Engineering, Rajalakshmi Engineering College, Chennai, India.Journal Article20221122Various alternative fuels have previously been investigated in light of growing concerns about environmental pollution and fuel depletion. In this study, the effects of Dimethyl Carbonate (DMC) as an alternative oxygenate to gasoline on the performance, emissions, and combustion characteristics of an inline four-cylinder Spark Ignited (SI) engine are investigated. Adding DMC to gasoline produced a higher Research octane number and oxygen percentage. The study found that using DMC/gasoline blends increased Brake Thermal Efficiency (BTE) and reduced unburned Hydrocarbons (HC) and Carbon Monoxide (CO) emissions. Furthermore, a mixture containing 30% DMC presented the engine's best performance and emission characteristics compared to gasoline. At higher engine speed, 8.95% higher BTE, 16.94% lesser HC, and 18.75% lesser CO than gasoline. A higher level of Nitrogen Oxide (NOx) is produced by DMC/gasoline blends when compared to gasoline. The combustion stability and heat release rate produced by DMC/gasoline blends were higher than gasoline.https://scientiairanica.sharif.edu/article_24130_323497da8498c259ab6794fc9bdd18aa.pdfSharif University of TechnologyScientia Iranica1026-3098321120260501Vibration analysis of size-dependent higher-order plates based on micropolar theory2413310.24200/sci.2024.61589.7388ENYazdanAlipourDepartment of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.SalehHamzehei-JavaranFaculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran.SaeedShojaeeDepartment of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.Journal Article20221223By considering micro-rotational Degrees of Freedom (DOF), the Micro-Polar Continuum Theory (MPCT) can characterize the effect of micro-structures on the mechanical analysis of material particles, which Classical Theories (CT) of elasticity are unable to describe. The vibration behavior of the higher-order plates with a drilling DOF is discussed in this article to suggest a novel size-dependent rectangular element based on the micropolar elasticity theory. To do this, a new general formulation of the MPCT, which can be employed with ease in the Finite Element Method (FEM), is initially developed. The displacements and micro-rotations are therefore computed using quadratic shape functions on a rectangular plate element. In this element, the proper stiffness and mass matrices for the drilling DOF are derived, and to demonstrate the precision and application of the proposed element, several numerical examples of micropolar plates with various boundary conditions have been carried out. The current finite element formulation shown here is effectively used to take into account the micropolar efficiency for modeling microplates. This research contributes to advancing our understanding of the mechanical response of materials at the microscale.https://scientiairanica.sharif.edu/article_24133_3a70797407903ea2ca485052778617b1.pdfSharif University of TechnologyScientia Iranica1026-3098321120260501A review of convective heat transfer in cavity-channel assemblies2413610.24200/sci.2023.61315.7246ENAhmed KadhimHusseinDepartment of Mechanical Engineering, College of Engineering, University of Babylon, Babylon City, Hilla, Iraq.AmaalAbdul Razaq Abdul HusseinDirectorate of Babylon Sewerage, Babylon Governorate, Hilla, Iraq.AwatefAbidiDepartment of Physics, College of Sciences Abha, King Khalid University, Saudi Arabia.Muneer A.IsmaelDepartment of Mechanical Engineering, Engineering College, University of Basrah, Iraq.College of Engineering, University of Warith Al-Anbiyaa, Karbala, Iraq.Ahmed B.MahdiDepartment of Anesthesia Techniques, Al-Mustaqbal University College, Babylon, Iraq.Bashar S.BasharAl-Nisour University College, Baghdad, Iraq.Farhan LaftaRashidDepartment of Petroleum Engineering, College of Engineering, University of Kerbala, Iraq.Raad Z.HomodDepartment of Oil and Gas Engineering, Basrah University for Oil and Gas, Basrah, Iraq.ObaiYounisDepartment of Mechanical Engineering, College of Engineering in Wadi Alddawasir, Prince Sattam Bin Abdulaziz University, Saudi Arabia.Department of Mechanical Engineering, Faculty of Engineering, University of Khartoum, Khartoum, Sudan.LiouaKolsiDepartment of Mechanical Engineering, College of Engineering, University of Hail, Saudi Arabia.Laboratory of Metrology and Energy Systems, Department of Energy Engineering, University of Monastir, Tunisia.Ali J.ChamkhaFaculty of Engineering, Kuwait College of Science and Technology, Doha District, Kuwait.Journal Article20221022Convective heat transfer induced in open cavities is one of the main pillars that the topic of energy saving relies on. This article reviews and categorizes the results of researches on mixed convection in open cavity connected with a channel and highlights the gap that should be filled in future works. It is found that the best heat and mass transfer is attained when the source of heat and/or species is located at a vertical wall of the cavity where it opposites the flow direction. The review has revealed that the experimental studies are relatively scare where it 10% of the total reviewed studies, while those dealing with nanofluids and porous media are 9% for each. It is found that the process of injection or aspiration of the flow have received very few studies despite its promised improvement of the heat and mass transfer. Furthermore, few researches have studied the contamination removing from the cavity.https://scientiairanica.sharif.edu/article_24136_ca0707cf714a7696e91c84627b1c6b29.pdfSharif University of TechnologyScientia Iranica1026-3098321120260501Rotational stagnation point non-Newtonian second-grade fluid flowing over spiraling disk2413710.24200/sci.2024.61513.7348ENAamarAbbasiDepartment of Mathematics, University of Azad Jammu and Kashmir Muzaffarabad, Pakistan.WasehFarooqDepartment of Mathematics, University of Azad Jammu and Kashmir Muzaffarabad, Pakistan.FazleMaboodDepartment of Information Technology, Fanshawe College London, ON Canada.AsmaTariqDepartment of Mathematics, University of Azad Jammu and Kashmir Muzaffarabad, Pakistan.Sabir AliShehzadDepartment of Mathematics, COMSATS University Islamabad, Sahiwal, Pakistan.Irfan AnjumBadruddinDepartment of Mechanical Engineering, College of Engineering, King Khalid University, Asir – Abha, KSA.Journal Article20221207A numerical study is conducted to execute the analysis of rotational stagnation point second-grade liquid flowing over the spiraling rotatory disk. Heat transmission analysis is accounted. The problem is formulated in the coupled partial differential equation forms which are later simplified in view of similar variables. The Keller-Box (KB) procedure is adopted for the execution of numerical solutions. The influence of involved parameters on the velocity and temperature profiles is presented and interpreted. The skin-frictions and Nusselt number are reported in the forms of numerical data. The present results are verified through comparison with already available material in the literature. This study addressed that the thickness layer of boundary augmented against the incrementing viscoelastic and rotational parameters. Both rotational and viscoelasticity resist the temperature. The rotational parameter rises radial skin-friction and heat transmission rate while is diminishes the swirl skin-friction.https://scientiairanica.sharif.edu/article_24137_dc291562832bc332241d2613a68ba92d.pdfSharif University of TechnologyScientia Iranica1026-3098321120260501Review of advanced combustion technology using low temperature combustion in automobile industries2414810.24200/sci.2024.61586.7387ENMuthusamy SubramiamKumaravelDepartment of Mechanical Engineering, Sri Jayaram Institute of Engineering and Technology, Chennai, India.Tharmarajapandian SurulivelRajanDepartment of Mechanical Engineering, Prince Shri Venkateshwara Padmavathy Engineering College, Chennai, India.NatarajanAlagumurthiDepartment of Mechanical Engineering, Pondicherry Engineering College, Pondicherry, India.PalaniappanThangavelDepartment of Mechanical Engineering, Shree Venkateshwara Hi-Tech Engineering College, Erode, India.KuppusamyRajaDepartment of Mechanical Engineering, Shree Venkateshwara Hi-Tech Engineering College, Erode, IndiaJournal Article20221211An overview has been presented related to the advances in Internal Combustion engines (IC) for future solutions of the automotive industry. This review discusses as many current research areas as possible. This evaluation will be of great assistance to students, researchers, and enterprises working on the subject of IC engines. Moreover, there are numerous technological options for delivering environmentally friendly vehicles with low carbon emissions. This paper also examines the methods available as well as the use of technology road-mapping to plan for future manufacturer adoption. The Low Temperature Combustion (LTC) technique is among the most sophisticated combustion technologies. Various LTC techniques like Homogeneous Charge Compression Ignition (HCCI), Premixed Charge Compression<br />Ignition (PCCI), and Reactivity Controlled Compression Ignition (RCCI) have been discussed in detail. The results of the evaluation of LTC against conventional engines were provided in order to demonstrate both the strengths and shortcomings of each. The goal of this review article is to show new combustion approaches and how they may be utilized to increase the engine's thermal efficiency while lowering Nitrogen Oxide )NOx) and Particulate Matter (PM) emissions. https://scientiairanica.sharif.edu/article_24148_666efe863bfefa907f7e49828d89da9c.pdf