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Improving shipboard electronics cooling system by optimizing the heat sinks configuration

Journal of Ocean Engineering and Science 2022年第5期7卷 498-508页

作者： Hamid Maleki mohammad reza safaei Arturo S.Leon Taseer Muhammad Truong Khang Nguyen Department of Mechanical Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran Department of Mechanical Engineering Florida International UniversityMiamiFL 33174USA Department of Medical Research China Medical University HospitalChina Medical UniversityTaichungTaiwan Mechanical Engineering Department Faculty of EngineeringKing Abdulaziz UniversityJeddahSaudi Arabia Department of Civil and Environmental Engineering Florida International UniversityMiamiFL 33174USA Department of Mathematics College of SciencesKing Khalid UniversityAbha 61413Saudi Arabia Division of Computational Physics Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Electrical and Electronics Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

With the increase of high-power electrical components in modern ships,especially fully electric ships with electric propulsion drive(EPD),the cooling of EPD electrical components has become particularly *** optimal configurations for heat sinks with high thermal efficiency plays an essential role in this regard.A new technique for improving the efficiency of heat sinks is the utilization of perforated *** study examined the effects of perforation geometry(shape and size)on laminar airflow flow and heat transfer characteristics over a perforated plate-fin heat ***-dimensional simulations were conducted using the finite-volume scheme based on the SIMPLE *** this research,the effects of perforation shape and size on various parameters,e.g.,total drag force,average Nusselt number,perforated fin efficiency(PFE),heat transfer performance enhancement(HTPE),and fin optimization factor(η)were *** results confirmed that at a specific heat transfer surface area for perforated fins,the highest efficiency is achieved by circular *** contrast,the square perforations due to geometric similarity to rectangular fins could reach the maximum ***,fins with square perforations could achieve the most optimal ***,results showed that for a constant perforations size,change in perforations shape improves HTPE,PFE,andηby more than 40%,45%,and 110%,***,by modifying perforations size for a specified shape,an increment of more than 35%,40%,and 150%is observed in HTPE,PFE,andη,respectively.

关键词： Forced convection Laminar flow Perforated fin Plate-fin heat sink Nusselt number

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Heat transfer and nanofluid flow over a porous plate with radiation and slip boundary conditions

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Journal of Central South University 2019年第5期26卷 1099-1115页

作者： Hamid MALEKI Jalal ALSARRAF Abbas MOGHANIZADEH Hassan HAJABDOLLAHI mohammad reza safaei Department of Mechanical Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran Department of Automotive and Marine Engineering Technology College of Technological StudiesThe Public Authority for Applied Education and TrainingKuwait Biomaterial Research Group Department of Materials EngineeringIsfahan University of TechnologyIsfahan 84156-83111Iran Department of Mechanical Engineering Vali-e-Asr University of RafsanjanRafsanjanIran Division of Computational Physics Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Electrical and Electronics Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

Presence of different terms with various values can alter the thermal behavior of the nanofluids flow over porous *** aim of this research is to study the influence of nanoparticles volume fraction,nanoparticles type,suction or injection,the heat generation or absorption,the Eckert number,thermal and velocity slip parameters,and radiation on the velocity and temperature fields on the flow and heat transfer over a porous flat *** different types of nanoparticles including metal nanoparticles (Cu),metal oxide nanoparticles (Al2O3) and carbon-based nanomaterials (MWCNTs and SWCNTs) which were dispersed in the water (as based fluid) are *** governing equations are converted into the ordinary differential equations using similarity solution and solved numerically by the RKF45 *** results of the simulations showed a contradiction with the results of other researchers who expressed that using nanoparticles with higher thermal conductivity and volume fraction led to increasing heat transfer rate in nanofluids;this study proves that,in some cases,boosting the volume fraction of nanoparticles has a potential to decrease the heat transfer rate due to significant changes in values of some parameters including radiation,heat generation,and viscous dissipation.

关键词： radiation slip condition porous surface heat generation/absorption viscous dissipation nanofluid

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A highly flexible green synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-dione derivatives with CuI nanoparticles as catalyst under solvent-free conditions

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Chinese Chemical Letters 2014年第3期25卷 401-405页

作者： Javad safaei-Ghomi Hossein Shahbazi-Alavi Abolfazl Ziarati Raheleh Teymuri mohammad reza Saberi Department of Organic Chemistry Faculty of ChemistryUniversity of Kashan

CuI nanoparticles as an efficient catalyst have been used for the preparation of 1H-pyrazolo[l,2- b]phthalazine-5,10-diones by the four-component condensation reaction of phthalic anhydride, hydrazine monohydrate, aromatic aldehydes and malononitrile or ethyl cyanoacetate under solvent- free conditions in good to excellent yields, short reaction times and environmentally benign, milder reaction conditions.

关键词： NanoparticlesMulti-component reactionsSolvent-freePyrazolophthalazine

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Numerical simulation of the Hall effect in magnetized accretion disks with the Pluto code

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Research in Astronomy and Astrophysics 2014年第1期14卷 93-103页

作者： mohammad Nakhaei Ghasem safaei Shahram Abbassi School of Physics Damghan University School of Astronomy Institute for Research in Fundamental Sciences Department of Physics School of SciencesFerdowsi University of Mashhad

We investigate the Hall effect in a standard magnetized accretion disk which is accompanied by dissipation due to viscosity and magnetic resistivity. By consider- ing an initial magnetic field, using the PLUTO code, we perform a numerical magne- tohydrodynamic simulation in order to study the effect of Hall diffusion on the physi- cal structure of the disk. Current density and temperature of the disk are significantly modified by Hall diffusion, but the global structure of the disk is not substantially affected. The changes in the current densities and temperature of the disk lead to a modification in the disk luminosity and radiation.

关键词： Hall effect -- accretion disks

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Zinc oxide nanoparticles:A highly efficient and readily recyclable catalyst for the synthesis of xanthenes

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Chinese Chemical Letters 2012年第11期23卷 1225-1229页

作者： Javad safaei-Ghomi mohammad Ali Ghasemzadeh Department of Organic Chemistry Faculty of ChemistryUniversity of Kashan

A novel and efficient route for the synthesis of 1,8-dioxooctahydroxanthenes and 14-aryl-14H-dibenzo[a,j]xanthenes is described through one-pot multi-component reaction of dimedone and 2-naphthol with various aryl aldehydes using ZnO nanoparticles under solvent-free conditions. This method provides a novel and improved pathway for the synthesis of xanthenes in the terms of excellent yields, short reaction times, reusability and low catalyst loading.

关键词： ZnO nanoparticles Xanthene Solvent-free Multi-component reaction Heterogeneous catalysts

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Turbulent boundary layers and hydrodynamic flow analysis of nanofluids over a plate

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Journal of Central South University 2021年第11期28卷 3340-3353页

作者： AOUINET Hana DHAHRI Maher safaei mohammad reza SAMMOUDA Habib ANQI Ali E. Higher Private School of Engineering and Applied Technology(IHE-ESPITA) SousseTunisia Laboratory of Energy and Materials(LabEM)(LR11ES34) High School of Sciences and Technology of Hammam SousseSousse UniversityBP 4011Hammam SousseTunisia Department of Medical Research China Medical University HospitalChina Medical UniversityTaiwanChina Mechanical Engineering Department Faculty of EngineeringKing Abdulaziz UniversityJeddahSaudi Arabia Department of Mechanical Engineering College of EngineeringKing Khalid UniversityAbha 61421Saudi Arabia Research Center for Advanced Materials Science(RCAMS) King Khalid UniversityAbhaSaudi Arabia

A numerical analysis of the log-law behavior for the turbulent boundary layer of a wall-bounded flow is performed over a flat plate immersed in three nanofluids(Zn O-water,SiO_(2)-water,TiO_(2)-water).Numerical simulations using CFD code are employed to investigate the boundary layer and the hydrodynamic *** validate the current numerical model,measurement points from published works were used,and the compared results were in good *** were carried out for the velocity series of 0.04,0.4 and 4 m/s and nanoparticle concentrations0.1% and 5%.The influence of nanoparticles’ concentration on velocity,temperature profiles,wall shear stress,and turbulent intensity was *** obtained results showed that the viscous sub-layer,the buffer layer,and the loglaw layer along the potential-flow layer could be analyzed based on their curving quality in the regions which have just a single wall *** was seen that the viscous sub-layer is the biggest area in comparison with other ***,the section where the temperature changes considerably correspond to the thermal boundary layer’s thickness goes a downward trend when the velocity *** thermal boundary layer gets deep away from the leading ***,a rise in the volume fraction of nanoparticles indicated a minor impact on the shear stress developed in the *** all cases,the thickness of the boundary layer undergoes a downward trend as the velocity increases,whereas increasing the nanoparticle concentrations would enhance the *** precisely,the log layer is closed with log law,and it is minimal between Y^(+)=50 and Y^(+)=*** temperature for nanoparticle concentration φ=5%is higher than that for φ=0.1%,in boundary layers,for all studied ***,it is established that the behavior is inverted from the value of Y^(+)=1 and the temperature for φ =0.1% is more important than the case of φ =5%.For turbulence intensity peak,this peak exists at Y^(+)

关键词： turbulent boundary layers nanofluids hydrodynamic flow wall shear stress turbulent intensity

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Chemical treatment for sand production control:A review of materials,methods,and field operations

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Petroleum Science 2023年第3期20卷 1640-1658页

作者： Ali safaei mohammad Asefi Mohsen Ahmadi Tayebe Pourshamsi Shima Baloochestanzadeh Ali Khalilnezhad Masoud Riazi Enhanced Oil Recovery(EOR)Research Centre IOR/EOR Research InstituteShiraz UniversityShirazIran Iran Food and Drug Administration(IFDA) Gerash University of Medical SciencesGerashIran Faculty of Petroleum and Natural Gas Engineering Sahand University of TechnologyTabrizIran

Sand production from loosely consolidated reservoirs is one of the critical issues in the oil and gas in-dustry all around the world that can cause many problems,such as erosion of surface and well equip-ment,sand accumulation in wells and operation facilities,buckling of casing in cased-hole wells and well productivity *** production control methods include restrictive production rate,mechanical methods(slotted liner,wire-wrapped screen,pre-packed screen,frac-pack,gravel pack,high-rate water pack)and chemical consolidation that chemical method is considered for more effectiveness in sand production alleviation due to increasing formation strength in near wellbore *** review provides an overview on the laboratory and filed operation investigations of chemical remedy for sand *** used chemical agents and more common laboratory tests for evaluating the chemical performance in sand consolidation are introduced in this ***,the results of field operations and in-jections of chemicals into the desired formation are also *** results show that the chemical sand consolidation is more effective in newly perforated wells which have no sand production experi-ence and have a production history of less than two ***,it was concluded that the main challenges in applying this method are permeability and capillary force reduction around the wellbore and selective injection into the targeted formation layers.

关键词： Sand production Loosely consolidated reservoirs Formation strength Chemical remedy Permeabilityreduction

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Modified unilateral periureteral injection technique in the treatment of patients with high-grade vesicoureteral reflux: A study of primary findings

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Asian Journal of Urology 2023年第1期10卷 96-100页

作者： Seyed Alaeddin Asgari Afshin safaei-Asl Mandana Mansour-Ghanaie Seyed mohammad Asgari Asghar Faryabi mohammadreza Bazli Faezeh Emami Sigaroudi Seyed Ahmad Naseri Alavi Urology Research Center Razi HospitalSchool of MedicineGuilan University of Medical SciencesRashtIran School of Medicine Guilan University of Medical SciencesRashtIran Faculty of Medicine Tabriz University of Medical SciencesTabrizIran

Objective:Although endoscopic treatment has been used by many pediatric urologists for the treatment of vesicoureteral reflux(VUR),it has no considerable success in high-grade *** aimed to describe the primary outcomes of unilateral periureteral injection technique(PIT),as well as bilateral PIT in high-grade ***:In this prospective study,we examined 92 ureters in 45 boys and 40 girls from February 2010 to May *** PIT and unilateral PIT were applied in 67 and 25 refluxing units,*** the unilateral PIT,the subureteral injection site was only at the 5-or 7-o’clock ***,in the bilateral PIT,the subureteral injection sites were at 5-and 7-o’clock ***-and post-operative reflux grades were evaluated by voiding cystourethrography 6 months after ***:Seven patients had bilateral ***,75(81.5%)ureters showed Grade IV VUR,while 17(18.5%)had primary Grade V *** mean age of the subjects was 39.2 *** unilateral PIT ureters,VUR was resolved in 23(92.0%)refluxing *** was downgraded to Grade III in one ureter(4.0%)and to Grade II in another ureter(4.0%).In addition,in bilateral PIT cases,VUR was resolved in 60(89.6%)ureters;it downgraded to Grades II and III in 3(4.5%)and 4(6.0%)refluxing units,***:Unilateral PIT can be highly effective in the treatment of selected ureters of high-grade ***,further studies are needed to confirm our results.

关键词： Periureteral injection technique Bilateral periureteral injection technique Unilateral periureteral injection technique Endoscopy Vesicoureteral reflux

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