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Comparative Evaluation and Performance Analysis of Heat Exchangers Featured with Peened Surface

Journal of Thermal Science 2025年第1期 50-61页

作者： DINESHBABU Chinnadurai shiva SANKARAN Nallasamy VENKATESH RAJA Krishnan VENKATESH Rathinavelu Department of Mechanical Engineering Kongunadu College of Engineering and Technology Department of Mechanical Engineering Selvam College of Technology Department of Mechanical Engineering Sona College of Technology Department of Mechanical Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical Sciences (SIMATS)Saveetha University

Heat exchangers have the potential for various engineering applications,and their performance is enriched by surface *** proposed system enriches the heat exchanger's performance by adapting a peened stainless steel（SS） surface blasted with copper,grinding,sand,and *** influences peened SS surface modified with a copper blast,grinding,sandblast,and iron blast on the surface morphology of shell and tube heat exchanger surface（STHE） is analyzed via tungsten heated cathode electron gun featured scanning electron microscope and observed coarse grain *** SS surface featured STHE performance is experimentally evaluated by different flow rates（30,60,90,and 120 L/min） underwater fluid medium functioned by the temperature ranges of 25-75℃ and its results are compared with computational fluid dynamic（CFD）/heat transfer research（HTRI） analyzed *** 60 L/min flow rate was spotted as an optimum value for both shell and tube side *** STHE is operated with a 60 L/min flow rate under the different peened surfaces and evaluated its Stanton number,Nusselt number,logarithmic mean temperature difference（LMTD）,overall heat transfer coefficient,number of transfer units（NTU）,effectiveness,and exergy *** iron blasted SS peened surface was observed to have better SHTE performance like Stanton number（0.0012）,Nusselt number（2180）,reduced LMTD of 31℃,improved overall heat transfer co-efficient of 2400 W/（m2·K）,better NTU of 0.5532,good effectiveness value of 0.451 62,and hiked exergy efficiency of 10% respectively.

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Technical aspect for oxidation of magnesium and aluminum nitrates to manufacture nano- and micro-sized MgAl2O4 spinel by combustion method

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Journal of Advanced Ceramics 2017年第3期6卷 187-195页

作者： shiva SALEM Faculty of Chemical Engineering Urmia University of Technology 57166-17165 Urmia Iran

In the present investigation, the nano- and micro-sized powders were synthesized by stoichiometric contents of magnesium and aluminum nitrates using combustion–oxidation method. The study was conducted over a wide range of operating conditions, in terms of fuel ratio and calcination temperature. The characteristics of magnesium aluminate powders were studied by differential thermal analysis and thermogravimetry (DTA–TG), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and transmission electron microscopy (TEM) techniques. The thermal stability of powders was evaluated by calcination at different temperatures. Differences of the specific surface areas were related to the composition and crystallite size. The importance of fuel ratio and calcination temperature to achieve the nano- and micro-sized oxide was discussed in detail. The fuel ratio of 0.56 and calcination at 800 ℃ provided the conditions to achieve the nano-scale magnesium aluminate powders, smaller than 20 nm. The application of presented algorithm can be an important tool for control of particle size in the nano- and micro-scale.

关键词： magnesium aluminate spinel oxidation nano-crystallite combustion calcination

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Effect of glycine-starch mixing ratio on the structural characteristics of MgAl2O4 nano-particles synthesized by sol-gel combustion

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Particuology 2016年第1期14卷 108-112页

作者： Arash Motevalian shiva Salem Faculty of Chemical Engineering Urrnia University of Technology Urrnia lran

Sol-gel auto-ignition was used to prepare nano-scale magnesium aluminate spinel, using nitrate salts as an oxidizer and glycine-starch mixtures as the fuel. The glycine-starch mixture was varied to understand the effect of fuel mixing ratio on the structural characteristics of the resulting magnesium aluminate. The products were characterized by thermogravimetric-differential thermal analyses, Fourier-transform infrared spectroscopy, X-ray diffraction, Brunauer-Emmett-Teller surface area measurements, and trans- mission electron microscopy. The phase purity and crystallite size of the powder products depended on the fuel mixing ratio. The presence of starch in the fuel facilitated the preparation of pure nano-particles. To prepare nano-particles of uniform spherical morphology and diameter of 〈 13 nm, the starch content should be Ol^timized to avoid agglomeration.

关键词： MgAl2O4 Starch Sol-gel Combustion Nano-particle Agglomeration

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Theoretical study of failure in composite pressure vessels subjected to low-velocity impact and internal pressure

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Frontiers of Structural and Civil Engineering 2020年第6期14卷 1349-1358页

作者： Roham RAFIEE Hossein RASHEDI shiva REZAEE Composites Research Laboratory Faculty o f New Science&TechnologiesUniversity o f TehranTehran ***Iran

A theoretical solution is aimed to be developed in this research for predicting the failure in internally pressurized composite pressure vessels exposed to low-velocity *** in-plane and out-of-plane failure modes are taken into account simultaneously and thus all components of the stress and strain fields are *** this purpose,layer-wise theory is employed in a composite cylinder under internal pressure and low-velocity *** stress/strain components are fed into appropriate failure criteria for investigating the occurrence of *** case of experiencing any in-plane failure mode,the evolution of damage is modeled using progressive damage modeling in the context of continuum damage ***,mechanical properties of failed ply are degraded and stress analysis is performed on the updated status of the *** the event of delamination occurrence,the solution is *** obtained results are validated with available experimental observations in open *** is observed that the sequence of in-plane failure and delamination varies by increasing the impact energy.

关键词： composite pressure vessel low-velocity impact failure theoretical solution progressive damage modeling

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Bioactive compounds, nutritional profile and health benefits of colostrum: a review

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Food Production, Processing and Nutrition 2022年第1期4卷 319-339页

作者： Amrita Poonia shiva Department of Dairy Science and Food Technology Institute of Agricultural SciencesBanaras Hindu UniversityVaranasiUttar Pradesh 221005India

Bovine colostrum is defined as first milk by milching animals responsible for providing the innate immunity to the neonatal and possess many immunoglobulins for preventing the calf from diseases. Colostrum consist of many bioactive compounds like proteins, enzymes, growth factors, immunoglobulins and nucleotides that provides several benefits to human health. Numerous clinical and pre-clinical studies have demonstrated the therapeutic benefits of the bovine colostrum. This review focusses on bioactive compounds, their health benefits, potential of colostrum for developing several health foods and prevention of respiratory and gastrointestinal tract disorders. Processing can also be done to extend shelf-life and extraction of bioactive constituents either as encapsulated or as extracts. The products derived from bovine colostrum are high-end supplements possessing high nutraceutical value.

关键词： Colostrum Functional foods Bioactive compounds Health benefits Microbial infections

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STUDYING THE ABRASION BEHAVIOR OF RUBBERY MATERIALS WITH COMBINED DESIGN OF EXPERIMENT-ARTIFICIAL NEURAL NETWORK

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Chinese Journal of Polymer Science 2012年第4期30卷 520-529页

作者： Mehdi shiva Hossein Atashi Mahtab Hassanpourfard Research and Development Department ofKavir Tire Company.P.O.Box 518.Birjand Iran Department of Chemical Engineering Sistan and Baluchestan UniversityP.O.Box 98-164161ZahedanIran Departmen ofChemical Engineering Amirkabir University of TechnologyTehranlran

In this study, an application of artificial neural network （ANN） has been presented in modeling and studying the effect of compounding variables on abrasion behavior of rubber formulations. Three case studies were carried out in which the experiment data were collected according to classical response surface designs. Besides developing the ANN models, we developed response surface methodology （RSM） to confirm the ANN predictions. A simple relation was employed for determination of relative importance of each variable according to ANN models. It was shown through these case studies that ANN models delivered very good data fitting and their simulating curves could help the researchers to better understand the abrasion behavior.

关键词： Abrasion Feed forward neural networks Rubber compounding Central composite design.

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DEM simulations of critical state behaviour of granular materials under various drained triaxial stress path tests

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Particuology 2023年第10期81卷 98-108页

作者： shiva Prashanth Kumar Kodicherla Guobin Gong Stephen Wilkinson Department of Civil Mining and Process EngineeringNamibia University of Science and TechnologyWindhoekNamibia Department of Civil Engineering Xi’an Jiaotong-Liverpool UniversitySuzhouChina Faculty of Engineering and Information Sciences University of WollongongDubai CampusDubaiUnited Arab Emirates

The present study investigates the critical state behaviour of granular assemblies composed of clumped particles under four different drained axisymmetric triaxial stress paths,using the discrete element method(DEM).A series of numerical samples were prepared at initial states with different density indexes(1D)and different initial confining pressures(ρ′0).These samples were sheared to large strains,at which constant stresses and volumes were maintained to reach the critical *** evolution of stress ratio under the same loading mode(for the same intermediate principal stress ratio,b)is shown to yield an almost identical behaviour independent of stress paths,whereas the stress-strain response depends on the stress *** different axisymmetric stress paths all share the same unique friction angle at critical state,indicating the Mohr-Coulomb failure criterion is the appropriate critical state strength criterion,which is at least true for the axisymmetric stress conditions.A unique coordination number(CN)is achieved at the critical state for a given po,which is independent of the stress *** critical state CN is found to increase with the increase in po,which could be attributed to the decrease in the critical state void ratio(ec)as mean effective stress(ρ′0)***,a unique linear functional relationship is found between the critical state values of cN and ec,and a unique polynomial functional relationship is found between the critical state values of CN andρ′.These functional relationships indicate no dependency on the stress paths or loading modes,thus characterizing unique features at critical states at both macroscopic and microscopic levels for a given type of granular material.

关键词： Discrete element method Critical state Drained behaviour Triaxial stress paths

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The roles of omega-3 and omega-6 fatty acids in idiopathic male infertility

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Asian Journal of Andrology 2012年第4期14卷 514-515页

作者： Mohammad Reza Safarinejad shiva Safarinejad Clinical Center for Urological Disease Diagnosis and Private Clinic Specialized in Urological and Andrological Genetics Tehran 19395-1849Iran

Omega-3 fatty acids found in some foods have a wide-range of health benefits. The omega-3 supplementation results in higher antioxidant activity in human seminal fluid and enhanced sperm count, sperm motility, and sperm morphology. Considerable number of infertile men with idiopathic oligoasthenoteratozoospermia might be benefit from omega-3 fatty acids administration.

关键词： Drug delivery Interventional cardiology Medical imaging Restenosis Thrombosis

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Fire sensitivity of broadleaf tree species in plantations of Kurdistan,Iran

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Journal of Forestry Research 2021年第3期32卷 1167-1176页

作者： Sabri Baqer Rasooli shiva Rashidi Naghi Shabanian Department of Geography College of EducationUniversity of GarmianKalarKurdistan RegionIraq Department of Forestry Faculty of Natural ResourcesUniversity of KurdistanSanandajIran

To better manage wildfires and plantations in Kurdistan,native tree species commonly used in planting and reviving forests such as Quercus brantii Lindl.,*** Olivier,*** Olivier,Pistachio atlantica Desf.,Fraxinus rotundifolia Vahl,and Robinia pseudoacacia *** evaluated and compared in terms of fire sensitivity and fire *** determine fire sensitivity,indices such as the fl ammability index,ignition time,fl ame durability,moisture content,carbonized surface,mass reduction,bulk density,as well as dry weight of wood,bark,and leaves were *** data were subjected to *** means obtained,after examining homogeneity or heterogeneity of the variances,were compared using parametric and nonparametric comparison *** was a significant difference at the level of 5%.Based on the analysis of these indices,the species could be divided into three groups:species sensitive to fire such as Robinia pseudoacacia,species moderately sensitive to fire such as ***,and species relatively resistant to fire,including ***,***,***,and ***.

关键词： Fire Flammability index Time to ignition Flame durability Moisture content

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Analytical Verification of Performance of Deep Neural Network Based Time-synchronized Distribution System State Estimation

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1126-1134页

作者： Behrouz Azimian shiva Moshtagh Anamitra Pal Shanshan Ma School of Electrical Computer and Energy EngineeringArizona State UniversityTempeAZ 85281USA Quanta Technology RaleighNC 27607USA

Recently,we demonstrated the success of a time-synchronized state estimator using deep neural networks(DNNs)for real-time unobservable distribution *** this paper,we provide analytical bounds on the performance of the state estimator as a function of perturbations in the input *** has already been shown that evaluating performance based only on the test dataset might not effectively indicate the ability of a trained DNN to handle input *** such,we analytically verify the robustness and trustworthiness of DNNs to input perturbations by treating them as mixed-integer linear programming(MILP)*** ability of batch normalization in addressing the scalability limitations of the MILP formulation is also *** framework is validated by performing time-synchronized distribution system state estimation for a modified IEEE 34-node system and a real-world large distribution system,both of which are incompletely observed by micro-phasor measurement units.

关键词： Deep neural network(DNN) distribution system state estimation(DSSE) mixed-integer linear programming(MILP) robustness trustworthiness

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