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Prediction of oil-water flow patterns, radial distribution of volume fraction, pressure and velocity during separated flows in horizontal pipe

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Journal of Hydrodynamics 2016年第4期28卷 658-668页

作者： Anand B.DESAMALA Vinayak vijayan Anjali DASARI Ashok Kumar DASMAHAPATRA Tapas K.MANDAL Department of Chemical Engineering Indian Institute of Technology Guwahati

Flow of two immiscible fluids gives rise to variety of flow patterns,which influence transportation *** this work,we present detailed analysis on the prediction of flow pattern maps and radial distribution of volume fraction,pressure and velocity of a pair of immiscible liquids through a horizontal pipeline by computational fluid dynamics（CFD） simulation using ANSYS FLUENT *** viscous oil and water have been taken as the fluid pair for *** of fluid（VOF） method has been employed to predict various flow patterns by assuming unsteady flow,immiscible liquid pair,constant liquid properties,and co-axial *** the grid independent study,we have selected 47 037 number of quadrilateral mesh elements for the entire *** successfully predicts almost all the flow patterns（viz.,plug,slug,stratified wavy,stratified mixed and annular）,except dispersion of oil in water and dispersion of water in *** simulated results are validated with experimental results of oil volume fraction and flow pattern *** distribution of volume fraction,pressure and velocity profiles describe the nature of the stratified wavy,stratified mixed and annular flow *** profiles help to developing the phenomenological correlations of interfacial characteristics in two-phase flow.

关键词： stratified Prediction pipe annular unsteady radial validated turbulent turbulence separated

Evaluation of machine learning algorithms for predictive Reynolds stress transport modeling

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Acta Mechanica Sinica 2022年第4期38卷 78-90,I0002页

作者： Jyoti Prakash Panda Hari vijayan Warrior Department of Mechanical Engineering DIT UniversityDehradun 248001India Department of Ocean Engineering and Naval Architecture Indian Institute of Technology(IIT)Kharagpur 721302India

The application of machine learning(ML)algorithms to turbulence modeling has shown promise over the last few years,but their application has been restricted to eddy viscosity based closure *** this article,we discuss the rationale for the application of machine learning with high-fidelity turbulence data to develop models at the level of Reynolds stress transport *** on these rationales,we compare different machine learning algorithms to determine their efficacy and robustness at modeling the different transport processes in the Reynolds stress transport *** data-driven algorithms include Random forests,gradient boosted trees,and neural *** direct numerical simulation(DNS)data for flow in channels are used both as training and testing of the ML *** optimal hyper-parameters of the ML algorithms are determined using Bayesian *** efficacy of the above-mentioned algorithms is assessed in the modeling and prediction of the terms in the Reynolds stress transport *** was observed that all three algorithms predict the turbulence parameters with an acceptable level of *** ML models are then applied for the prediction of the pressure strain correlation of flow cases that are different from the flows used for training,to assess their robustness and *** explores the assertion that ML-based data-driven turbulence models can overcome the modeling limitations associated with the traditional turbulence models and ML models trained with large amounts of data with different classes of flows can predict flow field with reasonable accuracy for unknown flows with similar flow *** addition to this verification,we carry out validation for the final ML models by assessing the importance of different input features for prediction.

关键词： Machine learning Pressure strain correlation Turbulence modeling CFD

Utilization of leather fibrous wastes for the production of reconstituted fibric materials:heavy metal determination and removal

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Waste Disposal and Sustainable Energy 2022年第1期4卷 29-37页

作者： Rethinam Senthil Serdar Batıkan Kavukcu A.Wilson Aruni Urana Dandar Bahri Basaran vijayan Sumathi Graduate School of Natural and Applied Science Ege University35100 BornovaIzmirTurkey School of Bio and Chemical Engineering Sathyabama UniversityChennaiTamilnadu 600199India Department of Chemistry Ege University35100 BornovaIzmirTurkey California University of Science and Medicine 217 E Club Centre Dr suite aSan BernardinoCA 92408USA Department of Leather Engineering Ege University35100 BornovaIzmirTurkey School of Electrical Engineering and Centre for Automation VIT Chennai CampusChennaiTamilnadu 600127India

Incomprehension concerning heavy metal containing finished solid leather wastes leads to environmental *** of these solid leather waste into energy and resource efficient products proves to be ***,leather microfibres(LMF)were isolated from these heavy metal containing finished solid leather *** heavy metal contain LMF further processed into metal reduction *** metal reduction LMF were investigated for their heavy metal removal efficiency and toxicity *** Cr(III)and Cr(VI)content of LMF was<1000μg/mL and<800μg/mL,*** estimation was proved that the LMF had less than 1%.The study attempt to prepare reconstituted fibric materials(RFM)from metal reduction LMF and cellulose nanofibres(CNF).RFM were characterized for their physicochemical and mechanical ***,the study has proved a novel concept of RFM production which is recyclable,environmental friendly and cost effective.

关键词： Leather fibres Metal recovery Leather wastes Reconstituted fibric material Recyling

Investigation on the key aspects of l-arginine para nitrobenzoate monohydrate single crystal:A non-linear optical material

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Chinese Journal of Chemical Engineering 2019年第3期27卷 701-708页

作者： Sonia N.vijayan Mahak Vij Kanika Thukral Naghma Khan D.Haranath Rajnikant M.S.Jayalakshmy Academy of Scientific and Innovative Research CSIR-National Physical Laboratory CSIR-National Physical Laboratory Department of Physics University of Jammu International and Inter University Centre for Nanoscience and Nanotechnology Mahatma Gandhi University

In the contemporary days, non-linear optical materials(NLO) are getting higher attention as per the increasing demand in optical communication and data storage technology. Consequently, they explore various physical properties of the NLO material for their industrial applications. In current report, l-arginine p-nitrobenzoate monohydrate(LANB) single crystals were obtained by adopting slow cooling technique. The structural confirmation of grown single crystal was carried out using single crystal X-Ray diffractometer. Presence of strain within single crystal was deduced using Hall–Williamson relation. Various defects associated within single crystal were assessed using high resolution XRD. Additionally, its crystalline quality was again confirmed by time resolved photoluminescence spectroscopy(TRPL). Using transmission spectra, the cut off wavelength and band gap of the host material was determined to be nearly 420 nm and 2.9 e V respectively. The dielectric property has been recorded by varying the frequency ranging from 50 Hz to 100 k Hz. The curve suggests that dielectric loss value is less at high frequency ensures the suitability of crystal in photonics and NLO based *** laser damage threshold values were also measured for single and multiple shots. Thermal parameters of the titled compound were calculated using PPE. In photoconductivity measurement, negative photoconductivity has been observed in titled compound. Microhardness studies were also performed on single crystal to explore its mechanical properties.

关键词： Photoluminescence Thermal conductivity Specific heat Thermal effusivity Damage threshold

Water absorption characteristics of Canarium Schweinfurthii fruits

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Information Processing in Agriculture 2019年第3期6卷 386-395页

作者： James Chinaka Ehiem Victor Ifeanyichukwu Obiora Ndirika Udochukwu Nelson Onwuka Yvan Gariepy vijayan Raghavan Department of Agricultural and Bio-Resources Engineering Michael Okpara University of AgricultureUmudikeP.M.B.7267UmuahiaAbia StateNigeria Department of Bioresources Engineering McGill UniversityMacdonald Campus21111 LakeshoreSte-Anne-de-BellevueQuebec H9X 3V9Canada

Water absorption characteristics of two varieties of Canarium Schweinfurthii ***(Canarium Schweinfurthii *** and short)essential for predicting their suitable absorption conditions was investigated at three different temperatures(35,50,65C).Increase in moisture content of the fruits was measured at one-hour interval until constant values were obtained after five successive intervals of moisture *** of soluble constituents,textural and nutritive qualities of the rehydrated products and their thermodynamic behavior were also measured and *** results obtained revealed that saturation time for 35,50 and 65C of long and short varieties are 14,18 and 40 h and 18,22 and 36 h *** of absorption of the fruits differ significantly(p>0.05)with temperature and not with the *** absorption rate of Canarium Schweinfurthii *** and short varieties are 2.71 and 2.25 kg/h *** moisture bearing capacity,textural,and nutritive qualities of the reconstituted products showed no significant difference among varieties at different temperatures *** soaked at 35C produced reusable residual water,retained their nutritive values and soluble constituent more than other soaking temperatures ***,the absorption reaction is endothermic with negative entropy and Gibbs energy values were above *** model had the best quality for describing the absorption characteristics of both Canarium Schweifurthii ***.

关键词： Absorption Canarium Thermodynamics Temperature Fruits Moisture

Molecular characterization and antibacterial effect of endophytic actinomycetes Nocardiopsis sp. GRG1 (KT235640) from brown algae against MDR strains of uropathogens

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Bioactive Materials 2016年第2期1卷 140-150页

作者： Govindan Rajivgandhi Ramachandran vijayan Marikani Kannan Malairaja Santhanakrishnan Natesan Manoharan Department of Marine Science Bharathidasan UniversityTiruchirappalli 24Tamil NaduIndia School of Life Sciences Jawaharlal Nehru UniversityNew Delhi 67India Department of Microbiology VHNSN CollegeVirudunagar 01Tamil NaduIndia Department of Marine and Coastal Studies Madurai Kamaraj UniversityMadurai 21Tamil NaduIndia

Our study is to evaluate the potential bioactive compound of Nocardiopsis ***1(KT235640)and its antibacterial activity against multi drug resistant strains(MDRS)on urinary tract infections(UTIs).Two brown algae samples were collected and were subjected to isolation of endophytic actinomycetes.100 strains of actinomycetes were isolated from algal samples based on observation of morphology and physiological characters.40 strains were active in antagonistic activity against various clinical *** the strains,10 showed better antimicrobial activity against MDRS on *** secondary metabolite of Nocardiopsis ***1(KT235640)has showed tremendous antibacterial activity against UTI pathogens compared to other *** of various growth parameters were used for synthesis of secondary metabolites,such as optimum pH 7,incubation time 5e7 days,temperature(30C),salinity(5%),fructose and mannitol as the suitable carbon and nitrogen *** 100 μg/ml concentration MIC of Nocardiopsis ***1(KT235640)showed highest percentage of inhibition against Proteus mirabilis(85%),and ***,Staphylococcus auerues,Psuedomonas aeroginasa,Enterobactor sp and Coagulinase negative staphylococci 78e85%respectively.

关键词： Endophytes Multi-drug resistant strains Urinary tract infections Minimal inhibitory concentration

Evaluation of phenolic contents and antioxidant activities of brown seaweeds belonging to Turbinaria spp.(Phaeophyta,Sargassaceae) collected from Gulf of Mannar

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Asian Pacific Journal of Tropical Biomedicine 2013年第1期3卷 8-16页

作者： Kajal Chakraborty Nammunayathuputhenkotta Krishnankartha Praveen Kodayan Kizekadath vijayan Gonugontla Syda Rao Marine Biotechnology Division Central Marine Fisheries Research Institute Central Marine Fisheries Research Institute

Objective:To evaluate the antioxidant activities and total phenolic contents of brown seaweeds belonging to Turbinaria spp.[Turbinaria conoides(***)and Turbinaria ornata(***)collected from Gulf of Mannar of southeastern coast of India in various in vitro ***:The antioxidant activity was evaluated using different in vitro systems,viz.,I,I-diphenyl-2-picrylhydrazyl(DPPH),2,2'-azino-bis-3 ethylbenzothiozoline-6-sulfonic acid diammonium salt(ABTS),H_20_2/H0 radical scavenging,Fe^(2+)ion chelating ability,and reducing ***-Ciocalteu method was used to determine the total phenolic content of the extracts,and the results were expressed as mg of gallic acid equivalents(GE)/g of the seaweed *** acid-reactive substances assay was employed to assess the ability of the seaweed extracts to inhibit lipid ***:Ethyl acetate(EtOAc)fraction of *** registered significantly higher phenolic content(105.97 mg GE/g)than that of ***(69.63 mg GE/g).Significantly higher antioxidant potential as determined by DPPH(64.14%)radical scavenging activity was registered in EtOAc fraction of ***.A higher ABTS(?)radical scavenging(IC_(50)3.16μg/mL),Fe^(2+)chelating(IC_(50)0.46 mg/mL),H_2O_2 scavenging(IC_(50)4.25 mg/mL),lipid peroxidation inhibitory(TBARS,IC_(50)0.21 mg/mL),and reducing abilities(IC_(50)52.67 mg/mL)(P<0.05)were realized in EtOAc fraction of *** than other ***:This study indicated the potential use of *** and *** as candidate species to be used as food supplements/functional foods to increase shelf-life of food items for human consumption,and nutraceuticals to deter deleterious free radical-induced life-threatening diseases.

关键词： Brown seaweeds Turbinaria conoides Turbinaria ornata Antioxidant activity Total phenolic contents

State-Based Offloading Model for Improving Response Rate of IoT Services

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Computers, Materials & Continua 2021年第6期67卷 3721-3735页

作者： K.Sakthidasan Bhekisipho Twala S.Yuvaraj K.vijayan S.Praveenkumar Prashant Mani C.Bharatiraja Department of Electronics and Communication Engineering Hindustan Institute of Technology and ScienceChennai603103India Faculty of Engineering Built Environment Durban University of Technology(DUT)UniversityDurban4001South Africa SRM Institute of Science and Technology Kattankulathur603203India SRM Institute of Science and Technology NCR CampusModinagar201204India

The Internet of Things(IoT)is a heterogeneous information sharing and access platform that provides services in a pervasive *** and computation offloading in the IoT helps to improve the response rate and the availability of *** offloading in a service-centric IoT environment mitigates the complexity in response delivery and request *** this paper,the state-based task offloading method(STOM)is introduced with a view to maximize the service response rate and reduce the response time of the varying request *** proposed method is designed using the Markov decision-making model to improve the rate of requests *** defining optimal states and filtering the actions based on the probability of response and request analysis,this method achieves less response *** on the defined states,request processing and resource allocations are performed to reduce the backlogs in handling multiple *** proposed method is verified for the response rate and time for the varying requests and processing servers through an experimental *** the experimental analysis,the proposed method is found to improve response rate and reduce backlogs,response time,and offloading factor by 11.5%,20.19%,20.31%,and 8.85%,respectively.

关键词： Decision-making internet of things markov model task offloading task graph

Foraging ecology of the globally threatened Nilgiri Wood Pigeon(Columba elphinstonii)in the Western Ghats,India

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Chinese Birds 2010年第1期01卷 9-21页

作者： Sellamuthu SOMASUNDARAM Lalitha vijayan Division of Conservation Ecology Salim Ali Center for Ornithology and Natural HistoryAnaikattyCoimbatore 641 108India Gujarat Institute of Desert Ecology Post Box No.83Opp.Changleswar TempleMundra RoadBhuj-Kuchch 370 001India

Foraging ecology of the globally endangered Nilgiri Wood Pigeon(Columba elphinstonii) was investigated in the Western Ghats,India,using faecal sampling and direct *** birds fed on fruits of 39 plant species,on seeds of 11 species,flowers and leaf buds of four species and a few ground *** observations across seasons showed nine plant species were selected more often(47% of observations),with fruits of the members of the family Lauraceae the most *** accounted for 76% of feeding methods throughout the *** was mainly from twigs at the edges on the upper and middle canopy(> 6 m).Frequency of feeding on fruits correlated significantly with fruit abundance,which depended on *** present study indicates that the pigeon requires a wide variety of diets from different forest *** of this species depends on preserving all habitat types required to meet their resource needs throughout the year.

关键词： Nilgiri Wood Pigeon Columba elphinstonii foraging ecology Western Ghats India