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Hydrothermal analysis of non-Newtonian fluid flow(blood)through the circular tube under prescrib e d non-uniform wall heat flux

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Theoretical & Applied Mechanics Letters 2022年第4期12卷 275-285页

作者： Shahin Faghiri Shahin Akbari Mohammad Behshad Shafii kh.hosseinzadeh Department of Mechanical Engineering Sharif University of TechnologyTehranIran Sharif Energy Water and Environment Institute(SEWEI)TehranIran

The present article aims to investigate the Graetz-Nusselt problem for blood as a non-Newtonian fluid obeying the power-law constitutive equation and flowing inside the axisymmetric tube subjected to nonuniform surface heat *** the flow field is determined by solving the continuity and the momentum equations,the energy equation is handled by employing the separation of variables *** resulting Eigen functions and Eigen values are numerically calculated using MATLAB built-in solver *** analysis is first conducted for the situation of constant heat flux and subsequently generalized to apply to the case of sinusoidal variation of wall heat flux along the tube length,using Duhamel’s ***,an approximate analytic solution is determined,employing an integral approach to solve the boundary layer *** respect to the comparison,the results of approximate solution display acceptable congruence with those of exact solution with an average error of 7.4%.Interestingly,with decreasing the power-law index,the discrepancy between the two presented methods significantly ***,the influences of the controlling parameters such as surface heat flux and power-law index on the non-Newtonian fluid flow’s thermal characteristics and structure are elaborately *** is found that switching from constant wall heat flux to non-uniform wall heat flux that sinusoidally varies along the tube length significantly improves the simulation’s accuracy due to the better characterization of the heat transport phenomenon in non-Newtonian fluid flow through the *** the presence of sinusoidally varying wall heat flux with an amplitude of 200 W/m 2 and when the power-law index is 0.25,the maximum arterial wall temperature is found to be about 311.56 K.

关键词： Non-newtonian fluid Power-law model Non-uniform heat flux Analytical solution

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Hydrothermal analysis of hybrid nanofluid flow on a vertical plate byconsidering slip condition

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Theoretical & Applied Mechanics Letters 2022年第5期12卷 306-314页

作者： M.R.Zangooee kh.hosseinzadeh D.D.Ganji Department of Mechanical Engineering Payamenoor University(PNU)TehranIran Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran

Hybrid nanofluids have attracted burgeoning attention owing to their outstanding capacity to improve heat *** influence of velocity and temperature slip parameter and nanoparticls’(NPs’)volume fraction on a vertical plate in the existence of suction has been explored in this *** investigation’s controlling partial differentiation equations were transformed into a conventional differential equation mechanism using resemblance *** were then solved employing the fifth-order Runge-Kutta *** skin coefficient of friction,temperature,and temperature gradient all rise when the volume percentage of NPs increases from 0 to 2%.Furthermore,a rise in the temperature slip variable was linked to a drop in the Nusselt number(heat transfer).The Nusselt number increased 0.15%and 5.63%respectively when the velocity slip parameter enhanced from 0 to 5 and the NPs volume percentage were increased from 0 to 1.5%.Furthermore,an increase in the temperature slip from 0 to 3 inflated the x-direction skin friction coefficient 8.2%,while inflation in the velocity slip from 0 to 5 was associated with a decline in the x-direction skin friction coefficient 95%.

关键词： Hybrid nanofluid Stagnation flow Velocity slip Temperature slip

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Investigation of nanofluid flow in a vertical channel considering polynomial boundary conditions by Akbari-Ganji’s method

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Theoretical & Applied Mechanics Letters 2022年第4期12卷 257-266页

作者： M.Fallah Najafabadi H.TalebiRostami kh.hosseinzadeh D.D.Ganji Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran Department of Mechanical Engineering Amirkabir University of TechnologyTehranIran

In this research,a vertical channel containing a laminar and fully developed nanofluid flow is *** channel surface’s boundary conditions for temperature and volume fraction functions are considered qth-order *** equations related to this problem have been extracted and then solved by the AGM and validated through the Runge-Kutta numerical method and another similar *** the study,the effect of parameters,including Grashof number,Brownian motion parameter,etc.,on the motion,velocity,temperature,and volume fraction of nanofluids have been *** results demonstrate that increasing the Gr number by 100%will increase the velocity profile function by 78%and decrease the temperature and fraction profiles by 20.87%and 120.75%.Moreover,rising the Brownian motion parameter in five different sizes(0.1,0.2,0.3,0.4,and 0.5)causes lesser velocity,about 24.3%at first and 4.35%at the last level,and a maximum 52.86%increase for temperature and a 24.32%rise for ψ occurs when N b rises from 0.1 to *** all N_(t) values,at least 55.44%,18.69%,for F(η),andΩ(η),and 20.23%rise for ψ(η)function is ***,enlarging the N r parameter from 0.25 to 0.1 leads F(η)to rise by 199.7%,fluid dimensionless temperature,and dimensional volume fraction to decrease by 18%and 92.3%.In the end,a greater value of q means a more powerful energy source,amplifying all velocity,temperature,and volume fraction *** main novelty of this research is the combined convection qth-order polynomials boundary condition applied to the channel ***,The AMG semi-analytical method is used as a novel method to solve the governing equations.

关键词： Akbari-Ganji’s method Nanofluid Vertical channel Combined convection Polynomial boundary condition

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Numerical investigation on convective heat transfer over two heated wall-mounted cubes in tandem and staggered arrangement

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Theoretical & Applied Mechanics Letters 2018年第3期8卷 171-183页

作者： S.M.Mousazadeh M.M.Shahmardan T.Tavangar kh.hosseinzadeh D.D.Ganji Department of Mechanical Engineering Shahrood University of Technology Department of Mechanical Engineering Babol Noushirvani University of Technology

In this study, laminar convective heat transfer over two heated wall-mounted cubes is *** cubes, which are under constant heat flux, are placed in different tandem and staggeredarrangements on a base plate. This problem is studied for different streamwise and spanwisedistances between two cubes in different Renolds number （Re）, by using finite-volume *** of these parameters are considered on flow and heat transfer characteristics. The resultsshow that the temperature distribution is strongly dependent on flow structure and varies with anychange of flow pattern in different arrangements of cubes. In addition, it is observed that the dragcoefficient, which is influenced more by pressure forces, in staggered arrangement, is greater thantandem arrangement. Results show that by increasing the spanwise distance the amount of meanNusselt number （Nu） of Cube 2 becomes the same as Cube 1.

关键词： Steady laminar flow Vortical structure Convective heat transfer Constant heat flux

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Metal foam and fin implementation into a triple concentric tube heat exchanger over melting evolution

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Theoretical & Applied Mechanics Letters 2022年第2期12卷 118-126页

作者： M.A.Erfani Moghaddam M.R.Hassani Soukht Abandani kh.hosseinzadeh Mohammad Behshad Shafii D.D.Ganji Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran Department of Mechanical Engineering Sharif University of TechnologyTehranIran

It is believed that it is going to be a sizeable mismatch between supply and demand when it comes to renewable ***,researchers are on course to compensate for the unpredictabilityof such resources by the employment of phase change materials(PCMs).Having multiple advantages,PCMs generally suffer from inadequate thermal conductivity which causes prolonged transition *** tackle this issue,this study is fixated on two parameterswhich are linked to fins addition and porous media incorporation in a melting process within a triple concentric tube heat exchanger(TCTHX).The results provided by multiple cases underlined the significance of natural convection in the bare system,although finned and copper-metal-foam cases outshine buoyancy forces by roughly 45%and 97%,*** is a major determent when it comes to the selection of porous media as Al_(2)O_(3) registered the weakest performance among SiC,Ni and Cu,however,it managed to speed up the process by 75%which still is much higher than the finned system,implying that porous media is of higher priority over *** best scenario transpiredwhile fins and copper metal foam were integrated as 26%and 97%soars in efficacy have been obtained compared to individual incorporation of porous media and fins,respectively.

关键词： Thermal storage TCTHX Fins Melting evolution Porous media Heat exchanger

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Experimental study on the dynamic response of a 3-D wedge under asymmetric impact

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Journal of Hydrodynamics 2024年第2期36卷 263-274页

作者： Saeed hosseinzadeh Kristjan Tabri Maritime Engineering Research Group School of EngineeringUniversity of SouthamptonSouthamptonUK Department of Civil Engineering and Architecture Tallinn University of TechnologyTallinnEstonia Marine Technology Competence Center Tallinn University of TechnologyKuressaareEstonia

Water entry problems represent complex multiphase flows involving air,water,and structure interaction,occurring rapidly in rough seas,and potentially effecting structural integrity of floating *** paper experimentally investigates asymmetric slamming loads acting on a 3-D elastic wedge *** specimen,featuring two different bottom plates(stiffened and unstiffened),each 4 mm thick,aims to assess the effect of structural stiffness on dynamic *** experiments are conducted at different drop heights of 25 cm and 50 cm and varying heel angles from 5°to 25°.The paper describes the experimental conditions,including wedge geometry,material properties,and the test *** study explores the influence of heel angle on impact acceleration,revealing an increase in peak acceleration with a higher inclination angle,particularly in the vertical ***,the hydrodynamic pressure resulting from asymmetric slamming is *** pressure results analyzed and compared at different locations along the length of the *** experimental findings indicate that,despite the leeward side(stiffened)experiencing a smaller hydrodynamic load,the heel angle significantly affects pressure results on the windward side(unstiffened),leading to a more pronounced dynamic *** time history of pressure results emphasizes the effect of elastic vibrations,particularly noticeable on the unstiffened bottom *** study contributes to a deeper understanding of asymmetric slamming on aluminum structures,facilitating the enhancement of mathematical models and the validation of numerical simulations.

关键词： Flexible fluid structure interactions(FFSI) experimental study asymmetric impact hydrodynamic pressure slamming loads

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A machine learning-guided design and manufacturing of wearable nanofibrous acoustic energy harvesters

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Nano Research 2024年第10期17卷 9181-9192页

作者： Negar hosseinzadeh Kouchehbaghi Maryam Yousefzadeh Aliakbar Gharehaghaji Safoora khosravi Danial khorsandi Reihaneh Haghniaz Ke Cao Mehmet R.Dokmeci Mohammad Rostami Ali khademhosseini Yangzhi Zhu Terasaki Institute for Biomedical Innovation Los AngelesCA 91367USA Department of Textile Engineering Amirkabir University of Technology(Tehran Polytechnic)Hafez Avenue*** TehranIran Department of Electrical and Computer Engineering University of British ColumbiaVancouverBC V6T1Z4Canada Chemical Sciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Computer Science University of Southern CaliforniaLos AngelesCA 90007USA

Nanofibrous acoustic energy harvesters(NAEHs)have emerged as promising wearable platforms for efficient noise-to-electricity conversion in distributed power energy systems and wearable sound amplifiers for assistive listening ***,their reallife efficacy is hampered by low power output,particularly in the low-frequency range(khz).This study introduces a novel approach to enhance the performance of NAEHs by applying machine learning(ML)techniques to guide the synthesis of electrospun polyvinylidene fluoride(PVDF)/polyurethane(PU)nanofibers,optimizing their application in wearable *** use a feed-forward neural network along with solving an optimization problem to find the optimal input values of the electrospinning(applied voltage,nozzle-collector distance,electrospinning time,and drum rotation speed)to generate maximum output performance(acoustic-to-electricity conversion efficiency).We first prepared a dataset to train the network to predict the output power given the input variables with high *** introducing the neural network,we fix the network and then solve an optimization problem using a genetic algorithm to search for the input values that lead to the maximum energy harvesting *** ML-guided wearable PVDF/PU NAEH platform can deliver a maximal acoustoelectric power density output of 829μW/cm^(3) within the surrounding noise *** addition,our system can function stably in a broad frequency(0.1-2 khz)with a high energy conversion efficiency of 66%.Sound recognition analysis reveals a robust correlation exceeding 0.85 among lexically akin terms with varying sound intensities,contrasting with a diminished correlation below 0.27 for words with disparate semantic ***,this work provides a previously unexplored route to utilize ML in advancing wearable NAEHs with excellent practicability.

关键词： wearable electronics acoustic energy harvester machine learning piezoelectric nanogenerator electrospun nanofiber

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Synthesis and characterization of nanocarbon from waste batteries via an eco-friendly method

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Waste Disposal and Sustainable Energy 2024年第2期6卷 197-208页

作者： Maraim kh.Uoda Hussein Q.Hussein Rana R.Jalil Chemical Engineering Department College of EngineeringUniversity of BaghdadBaghdadIraq Thi.Qar Oil Company NassriyaIraq Petroleum Research and Development Center BaghdadIraq

The widespread use of disposable batteries to power common electronic devices is a major source of *** are growing environmental and health concerns due to the expansion of e-waste around the ***,developing a reli-able system for recycling old batteries has reached the top of the recycling priority *** current study presents a novel approach to synthesis carbon nanoparticles(CNPs)from spent batteries via an eco-friendly method that offers economical,environment-friendly,and nontoxic approaches in comparison to conventional chemical *** synthesized nano-particles were characterized by field emission scanning electron microscopy(FE-SEM),energy-dispersive X-ray(EDX),powder X-ray diffractometry(XRD),UV-VIS absorption analysis(UV),Fourier transform infrared spectroscopy(FT-IR),Atomic force microscope(AFM),and thermo-gravimetric analysis(TGA).The average diameter of the synthesized particles was 40.16 nm,and the particles tended to be aspherical in *** analysis also predicted the presence of pure carbon,with some contamination arrived at 15%(in weight).This is a novel study in which nanocarbons were synthesized in a brine(7600x10-6)from a target(CNPs>75 nm),which paves the way for future use of CNPs derived from spent batteries and helps the environment by decreasing the amount of electronic waste dumped in landfills.

关键词： Novel Zn-C battery Carbon nanoparticles Characterization Eco-friendly methods

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Tracking performance of large margin classifier in automatic modulation classification with a software radio environment

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Journal of Systems Engineering and Electronics 2014年第5期25卷 735-741页

作者： Hamidreza hosseinzadeh Department of Electrical and Computer Engineering Science and Research BranchIslamic Azad University

Automatic modulation classification is the process of identification of the modulation type of a signal in a general environment. This paper proposes a new method to evaluate the tracking performance of large margin classifier against signal-tonoise ratio （SNR）, and classifies all forms of primary user＇s signals in a cognitive radio environment. For achieving this objective, two structures of a large margin are developed in additive white Gaussian noise （AWGN） channels with priori unknown SNR. A combination of higher order statistics and instantaneous characteristics is selected as effective features. Simulation results show that the classification rates of the proposed structures are well robust against environmental SNR changes.

关键词： automatic modulation classification (AMC) tracking performance evaluation passive-aggressive (PA) classifier self- training cognitive radio (CR).

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Preparation of transparent nanostructured N-doped TiO_2 thin films by combination of sonochemical and CVD methods with visible light photocatalytic activity

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Journal of Advanced Ceramics 2018年第3期7卷 185-196页

作者： Hossein RASOULNEZHAD Ghader hosseinzadeh Reza hosseinzadeh Naser GHASEMIAN Department of Electrical & Electronics Engineering Standard Research Institute (SRI) Department of Chemical Engineering University of Bonab Medical Laser Research Group Medical Laser Research Center

Pollution of water resources with pesticide compounds has raised serious environmental problems,and for photocatalytic degradation of these pollutants,thin film photocatalysts are preferred to colloidal ones due to the separation problem of colloidal *** this work,nanostructured TiO_2 and N-doped TiO_2 thin films with high transparency were deposited on glass and quartz substrates through sonochemical–chemical vapor deposition(CVD)*** films prepared on glass and quartz substrates had nanocubic and nanospherical morphology,*** presence of N atoms in the structure of TiO_2 resulted in a decrease in the band gap energy of TiO_2 and also in the reduction of photogenerated electron–hole recombination ***,the presence of N atoms induced the formation of Ti^(3+)species which can act as hole trapping *** prepared thin films were also used for the visible light photocatalytic degradation of paraoxon *** to these results among the prepared thin films,the N-doped TiO_2 thin films have higher photocatalytic activity than pure TiO_2 thin ***,in comparison with the thin films deposited on quartz substrate,the films on glass substrate have higher photocatalytic performance,which can be related to the special nanocubic morphology of these samples.

关键词： N-doped TiO2 film transparent photocatalyst chemical vapor deposition (CVD) ultrasonic

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