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Thermal performance and entropy generation for nanofluid jet injection on a ribbed microchannel with oscillating heat flux: Investigation of the first and second laws of thermodynamics

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Chinese Journal of Chemical Engineering 2022年第2期35卷 450-464页

作者： Yu-Liang Sun Davood Toghraie Omid ali akbari Farzad Pourfattah As’ad alizadeh Navid Ghajari Mehran Aghajani School of Science Huzhou UniversityHuzhou 313000China Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Young Researchers and Elite Club Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering University of KashanKashanIran Department of Mechanical Engineering College of EngineeringUniversity of ZakhoZakhoIraq

In current numerical study,forced flow and heat transfer of water/NDG(Nitrogen-doped graphene)nanofluid in nanoparticles mass fractions(φ)of 0,2%and 4%at Reynolds numbers(Re)of 10,50,100 and 150 are simulated in steady *** geometry is a two-dimensional microchannel under the influence of nanofluid jet *** of inlet fluid equals with Tc=293 K and hot source of microchannel is under the influence of oscillating heat ***,in this research,the effect of the variations of attack angle of triangular rib(15°,30°,45°and 60°)on laminar nanofluid flow behavior inside the studied rectangular geometry with the ratio of L/H=28 and nanofluid jet injection is *** results indicate that the increase of Reynolds number,nanoparticles mass fraction and attack angle of rib leads to the increase of pressure *** increasing fluid viscosity,momentum depreciation of fluid in collusion with microchannel surfaces ***,the increase of attack angle of rib at higher Reynolds numbers has a great effect on this *** low Reynolds numbers,due to slow motion of fluid,variations of attack angle of rib,especially in angles of 30°,45°and 60°are almost *** increasing fluid velocity,the effect of the variations of attack angle on pressure drop becomes significant and pressure drop figures act *** general,by using heat transfer enhancement methods in studied geometry,heat transfer increases almost 25%.

关键词： Ribbed microchannel Forced heat transfer Numerical study Nanofluid Attack angle of rib

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Nano-TiO_2:An eco-friendly alternative for the synthesis of quinoxalines

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Chinese Chemical Letters 2011年第6期22卷 753-756页

作者： Bi Bi Fatemeh Mirjalili ali akbari Department of Chemistry College of Science Yazd University

Nano-TiO_2 as an eco-friendly and efficient nanocatalyst was applied for quinoxaline preparation with improved *** this protocol,diketones and 1,2-diamines were condensed in the presence of catalyst at room temperature.

关键词： Nano-TiO_2 Quinoxalines 1 2-Diketones 1 2-Diamines

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A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel

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Chinese Journal of Chemical Engineering 2020年第2期28卷 383-402页

作者： Sajad Mir Omid ali akbari Davood Toghraie Ghanbarali Sheikhzadeh ali Marzban Saeid Mir Pouyan Talebizadehsardari Department of Mechanical Engineering Aligoudarz BranchIslamic Azad UniversityAligoudarzIran Young Researchers and Elite Club Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering University of KashanKashanIran Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Applied Sciences Ton Duc Thang UniversityHo Chi Minh CityVietnam

In this research,laminar flow and heat transfer of two-phase water/Ag nanofluid with 0–6%volume fraction of nanoparticles at Re=150–700 in a curved geometry are simulated using finite volume *** geometry is an elliptical curved minichannel with curvature angle of 180°.Forced and natural flow of two-phase nanofluid is simulated at Gr=15000,35000 and *** estimation of nanofluid flow behavior,two-phase mixture method is *** second-order discretization and SIMPLEC algorithm are used for solving governing *** results indicate that the increase of volume fraction of nanoparticles leads to the enhancement of the temperature of central line of *** increase of Grashof number(Gr^75000)has a great effect on reduction of dimensionless temperature in central line of *** of thermal boundary layer at Re=500 and after the angle of 30°becomes *** low Grashof numbers(Gr^15000),due to the great effects of temperature gradients close to wall,these regions have significant entropy generation.

关键词： Elliptical minichannel Mixed convection Numerical study Nanofluid Finite volume method Friction factor

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Microstructural analyses of aluminum–magnesium–silicon alloys welded by pulsed Nd: YAG laser welding

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International Journal of Minerals,Metallurgy and Materials 2020年第5期27卷 660-668页

作者： Hossain Ebrahimzadeh Hassan Farhangi Seyed ali Asghar akbari Mousavi Arman Ghahramani School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranTehran 11155-4563Iran

Revealing grains and very fine dendrites in a solidified weld metal of aluminum–magnesium–silicon alloys is difficult and thus,there is no evidence to validate the micro-and meso-scale physical models for hot cracks. In this research, the effect of preheating on the microstructure and hot crack creation in the pulsed laser welding of AA 6061 was investigated by an optical microscope and field emission electron microscopy. Etching was carried out in the gas phase using fresh Keller’s reagent for 600 s. The results showed that the grain size of the weld metal was proportional to the grain size of the base metal and was independent of the preheating temperature. Hot cracks passed the grain boundaries of the weld and the base metal. Lower solidification rates in the preheated samples led to coarser arm spacing;therefore, a lower cooling rate. Despite the results predicted by the micro and meso-scale models, lower cooling rates resulted in increased hot cracks. The cracks could grow in the weld metal after solidification;therefore, hot cracks were larger than predicted by the hot crack prediction models.

关键词： etching technique laser welding inter-dendritic spacing grain size aluminum–magnesium–silicon alloys hot crack formation model

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Synthesis of 14-aryl or alkyl-14H-dibenzo[a,j]xanthenes promoted by Mg(HSO_4)_2

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Chinese Chemical Letters 2011年第1期22卷 45-48页

作者： Bi Bi Fatemeh Mirjalili Abdolhamid Bamoniri ali akbari Department of Chemistry College of ScienceYazd UniversityYazdP.O.Box 89195-741Iran Department of Organic Chemistry Faculty of ChemistryUniversity of KashanKashanIran

14-Aryl or alkyl-14H-dibenzo[a,j]xanthenes were prepared by condensation of 2-naphthol and aldehydes in the presence of Mg（HSO4）2 as an efficient, cheap, readily available and eco-friendly catalyst. This procedure h... 详细信息

关键词： 14-Aryl or alkyl-14H-dibenzo [a,j]xanthene Mg(HSO4)2 Xanthenes 2-Naphthol Ultrasound

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A numerical simulation case study of the coastal currents and upwelling in the western Persian Gulf

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Journal of Ocean Engineering and Science 2020年第4期5卷 323-332页

作者： Hesameddin Mehrfar Masoud Torabi Azad Kamran Lari Abbas-ali ali-akbari Bidokhti Department of Natural Resources and Environment Islamic Azad UniversityScience and Research BranchTehranIran Department of Marine Science and Technology Islamic Azad UniversityNorth Tehran BranchTehranIran Institute of Geophysics University of TehranTehranIran

The present study employed COHERENS model as a three-dimensional hydrodynamic model to address the coastal currents in the western Persian Gulf with a horizontal resolution of 2-minutes of latitude and *** obtained results suggested that Iranian northwestward coastal currents developed from January to April and experienced their maximum intensity from June to August when the rate of the surface inflow current increases through the Strait of Hormuz and the stability of the seasonal thermocline becomes gradually *** simulation results reflected that expansions of the thermocline area began by the arrival of the warm *** such circumstances,some stronger coastal currents were generated in *** strong coastal surface current in the vicinity of the western part of Iranian coasts flew southeastward,while the reverse current flew with a northwestern direction in the *** obtained results suggested that a consequence of the influence of salinity flux,especially on the Iranian coasts,the speed of currents *** findings of this study showed that more kinetic energy was accumulated along Iranian ***,the current vectors on Iranian coasts were greater than those on Arabian coasts,which in turn resulted in the creation of the upwelling currents along western Iranian coasts.

关键词： Coastal Currents COHERENS Model Numerical Simulation Persian Gulf(PG) Upwelling

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An evaluation of harvesting costs in present and planned operations: case study—Waston District of Mazandaran Wood and Paper Industries

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Journal of Forestry Research 2018年第1期29卷 215-220页

作者： Majid Lotfalian Mohammad ali akbari Gorji Seyed Ataollah Hoseini Maryam Kazemi Department of Forestry Faculty of Natural Resources Sari University of Agricultural Sciences and Natural Resources Forestry Master of Science Graduates Faculty of Natural Resources Sari University of Agricultural Sciences and Natural Resources Department of Forestry Faculty of Natural ResourcesTehran University

Amongst all forest utilization phases, harvesting plays a key role as the beginning phase of the utilization cycle and has a significant effect on the following *** this research, in order to examine the reduction of costs with respect to present and planned operations, the starting time of the harvesting or cutting phase and work flow were recorded. The starting time of each phase of the entire operation was recorded as well. Before harvesting the marked tree, the appropriate felling direction was determined and the azimuth of the correct direction was *** results indicate that there was not a meaningful relationship between the differences in direction of a leaning tree compared with the felling direction. However, there was a significant relationship between the difference of the defined and felling direction and the difference in tree leaning and defined direction. The same trend was observed between tree leaning and felling directions and tree leaning and defined directions. On the other hand,there was no significant relationship between tree leaning and felling directions and the defined and tree felling directions. In addition, this research shows that with an increase in tree volume, the time for tree cutting ***, when the difference of tree leaning and felling direction decreased, the time to cut the tree *** regression equation is Y = 168.9–0.14（the difference between tree leaning and felling direction）＋ 0.7（volume）.

关键词： Chainsaw Felling direction Cutting time Tree leaning direction

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Cube-octameric silsesquioxane (POSS)-capped magnetic iron oxide nanoparticles for the efficient removal of methylene blue

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 563-573页

作者： ali akbari Nasser Arsalani Bagher Eftekhari-Sis Mojtaba Amini Gholamreza Gohari Esmaiel Jabbari Department of Chemistry Faculty of ScienceUniversity of MaraghehMaraghehIran Research Laboratory of Polymer Department of Organic and BiochemistryFaculty of ChemistryUniversity of TabrizTabrizIran Department of Horticulture Faculty of AgricultureUniversity of MaraghehMaraghehIran Department of Chemical Engineering University of South CarolinaColumbiaSC 29208USA

Octavinyl polyhedral oligomeric silsesquioxane (POSS) was polymerized on the surface of Fe3O4 nanoparticles (NPs) and then the NPs were functionalized with carboxylic acid groups using thiol-ene click reactions with thioglycolic *** as-prepared Fe3O4@POSS-COOH magnetic hybrid NPs had mesoporous structures with an average particle diameter of 15 nm and a relatively high specific surface area of 447 m^2· g^-*** results showed that 4 mg of Fe3O4@POSS-COOH NPs efficiently adsorbed and removed methylene blue from water at 5 *** is due to the presence of both carboxylic acid and pendant vinyl groups on the Fe3O4@POSS-COOH *** NPs could be easily withdrawn from water within a few seconds under moderate magnetic field and showed high stability in acid and alkaline aqueous mediums.

关键词： nanomagnetic POSS surface polymerization thiol-ene reaction adsorbent water treatment

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Voltammetric determination of isoproterenol using a 5-amino-2',4'-dimethoxybiphenyl-2-ol modified carbon nanotube paste electrode

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Chinese Chemical Letters 2012年第6期23卷 719-722页

作者： Hadi Beitollahi Hoj atollah Khabazzadeh Hassan Karimi-Maleh ali akbari Environment Department Research Institute of Environmental SciencesInternational Center for ScienceHigh Technology & Environmental SciencesKermanIran Department of Chemistry Shahid Bahonar University of KermanKermanIran Department of Chemistry Science and Research BranchIslamic Azad UniversityMazandaranIran Department of Chemistry University of JiroftJiroftIran

A new electrochemical sensor for determination of isoproterenol （IP） is described. The sensor is based on carbon paste electrode （CPE） modified with 5-amino-2＇,4＇-dimethoxybiphenyl-2-ol （5ADMB） and takes the advantages of carbon nanotubes （CNTs）. Under the optimum pH of 7.0, the oxidation of IP occurs at a potential about 210 mV less positive than that of the unmodified CPE. The oxidation currents increased linearly with two concentration intervals oflP, one is 0.09 to 20.0 μ mol/L and, the other is 20.0 to 400.0 μmol/L. The detection limit （3or） obtained by square wave voltammetry （SWV） was 39.0 μmol/L. The practical application of the modified electrode was demonstrated by determining IP in IP ampoule, urine and human blood serum samples.

关键词： Isoperoterenol Carbon nanotube Electrocatalysis Voltammetry

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Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

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Chinese Journal of Chemical Engineering 2020年第3期28卷 643-659页

作者： Milad Gholami Mohammad Reza Nazari Mohammad Hossien Talebi Farzad Pourfattah Omid ali akbari Davood Toghraie Department of Mechanical Engineering Yazd UniversityYazdIran School of Mechanical Engineering Science&Arts UniversityYazdIran Mechanical Engineering Department University of Kashan KashanIran Young Researchers and Elite Club Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran

In this numerical study,natural flow and heat transfer of nanofluids with Al2O3,TiO2,Cu and CNT nanoparticles in a vertical channel with dimpled fins at Rayleigh number(Ra)of Ra=3.25×107 to Ra=1×108 are investigated by using the finite volume *** obtained results revealed that,using CNT in volume fractions of 2%and 4%leads to significant heat transfer and atφ=6%,using TiO2 nanoparticles has a great effect on Nu number ***,using solid nanoparticles in base fluid causes more uniform heat transfer distribution,especially in areas close to heated surface and by adding more volume fraction in base fluid,temperature level *** general,according to temperature contours,reduction of wall temperature depends on the increase of Ra and volume fraction and the type of solid nanoparticles.

关键词： Natural heat transfer Dimpled fins Rayleigh number Nanofluid

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