Pub Date : 2020-08-06DOI: 10.37516/https://doi.org/10.37516/global.j.mater.sci.eng.2020.001
K. AmritaPrabhu, Ferrao Rebecca De Maria, Karan Manoj, N. Satish, S. SaiHarshitha, S. Siddiqui, Vivek
The investigations focus on analyzing acoustic enclosures intended for noisy Chemical Engineering equipment made out of natural waste materials namely corn cobs, corn stovers and banana stalks using Actran Software with the parameters of study being the comparison between different dimensions of enclosure and material properties of different substances used. Upto 50 Hz frequency, there was no evident distinction in the Pressure-map between two dimensions of enclosures, while beyond 50 Hz, there was a difference with the larger enclosure encountering greater pressure intensities as well as greater ranges of pressure intensities. In the frequency range of 40 Hz - 75 Hz for the smaller enclosure and 30 Hz - 65 Hz for the larger, there was a significant effect of the changing material properties on the sound absorbing ability of the enclosure. When the two plots of enclosures for changing material properties were compared, some amount of instability in the graphs of the three materials was encountered at higher frequencies in the case of the larger enclosure. Upon analyzing the results, banana stalks showed better sound absorption potential followed by corn cobs and corn stovers at frequencies in the range 40 Hz - 70 Hz.
{"title":"ANALYSIS OF PREPARED ACOUSTIC BOARDS FROM NATURAL WASTE MATERIALS USING ACTRAN SOFTWARE AND ITS APPLICATION","authors":"K. AmritaPrabhu, Ferrao Rebecca De Maria, Karan Manoj, N. Satish, S. SaiHarshitha, S. Siddiqui, Vivek","doi":"10.37516/https://doi.org/10.37516/global.j.mater.sci.eng.2020.001","DOIUrl":"https://doi.org/10.37516/https://doi.org/10.37516/global.j.mater.sci.eng.2020.001","url":null,"abstract":"The investigations focus on analyzing acoustic enclosures intended for noisy Chemical Engineering equipment made out of natural waste materials namely corn cobs, corn stovers and banana stalks using Actran Software with the parameters of study being the comparison between different dimensions of enclosure and material properties of different substances used. Upto 50 Hz frequency, there was no evident distinction in the Pressure-map between two dimensions of enclosures, while beyond 50 Hz, there was a difference with the larger enclosure encountering greater pressure intensities as well as greater ranges of pressure intensities. In the frequency range of 40 Hz - 75 Hz for the smaller enclosure and 30 Hz - 65 Hz for the larger, there was a significant effect of the changing material properties on the sound absorbing ability of the enclosure. When the two plots of enclosures for changing material properties were compared, some amount of instability in the graphs of the three materials was encountered at higher frequencies in the case of the larger enclosure. Upon analyzing the results, banana stalks showed better sound absorption potential followed by corn cobs and corn stovers at frequencies in the range 40 Hz - 70 Hz.","PeriodicalId":230277,"journal":{"name":"Global Journal of Material Science and Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124869856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-17DOI: 10.37516/global.j.mater.sci.eng.2019.0076
S. L. Hake, P. R. Awasarmal, R. M. Damgir
The production of cement is harmful to the environment. It is important to decrease the creation of Ordinary Portland Concrete. On the opposite side, the thermal power plant expends hectares of land for the dumping of fly fiery remains which is waste material. This paper concentrates on low calcium fly ash based geopolymer concrete. In the geopolymer concrete, the diverse centralization of sodium hydroxide, for example, 8, 10, 12, 14, 16, 18, and 20 molars was utilized. The sodium silicate to sodium hydroxide proportion kept up as 2.5. The eight rate convergence of sulfuric and hydrochloric acid were utilized for the corrosive assault on fly ash based geopolymer concrete. The test perform for oven and steam cured fly ash based geopolymer concrete. The streamlined level of warming utilized for various curing techniques. After the curing, the cube kept in sulfuric and hydrochloric acidic condition for up to the half year. The acidic impact assessed at once interim of 0, 45, 90, 135, 180 days. It is watched that the sulfuric corrosive is unsafe to the fly powder based geopolymer concrete as contrast with hydrochloric corrosive. The cube sample cured for oven and steam curing. The optimized degree of heating used for different curing methods. After the curing, the cube sample were kept in sulfuric and hydrochloric acidic environment for up to the six months. The acidic effect evaluated at a time interval of 0, 45, 90, 135, 180 days. It is observed that the sulfuric acid is harmful to the fly ash based geopolymer concrete as compare to hydrochloric acid.
{"title":"DURABILITY STUDY ON FLY ASH BASED GEOPOLYMER CONCRETE FOR ACIDIC ENVIRONMENT","authors":"S. L. Hake, P. R. Awasarmal, R. M. Damgir","doi":"10.37516/global.j.mater.sci.eng.2019.0076","DOIUrl":"https://doi.org/10.37516/global.j.mater.sci.eng.2019.0076","url":null,"abstract":"The production of cement is harmful to the environment. It is important to decrease the creation of Ordinary Portland Concrete. On the opposite side, the thermal power plant expends hectares of land for the dumping of fly fiery remains which is waste material. This paper concentrates on low calcium fly ash based geopolymer concrete. In the geopolymer concrete, the diverse centralization of sodium hydroxide, for example, 8, 10, 12, 14, 16, 18, and 20 molars was utilized. The sodium silicate to sodium hydroxide proportion kept up as 2.5. The eight rate convergence of sulfuric and hydrochloric acid were utilized for the corrosive assault on fly ash based geopolymer concrete. The test perform for oven and steam cured fly ash based geopolymer concrete. The streamlined level of warming utilized for various curing techniques. After the curing, the cube kept in sulfuric and hydrochloric acidic condition for up to the half year. The acidic impact assessed at once interim of 0, 45, 90, 135, 180 days. It is watched that the sulfuric corrosive is unsafe to the fly powder based geopolymer concrete as contrast with hydrochloric corrosive. The cube sample cured for oven and steam curing. The optimized degree of heating used for different curing methods. After the curing, the cube sample were kept in sulfuric and hydrochloric acidic environment for up to the six months. The acidic effect evaluated at a time interval of 0, 45, 90, 135, 180 days. It is observed that the sulfuric acid is harmful to the fly ash based geopolymer concrete as compare to hydrochloric acid.","PeriodicalId":230277,"journal":{"name":"Global Journal of Material Science and Engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123009957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-15DOI: 10.37516/global.j.mater.sci.eng.2019.0053
M. A. El-Sayed
Entrapped double oxide films are known to be the most detrimental defects in cast aluminium alloys. The research reported here was aimed at surveying the results of previous researches studying how these defects develop with time, with the intention of understanding their behaviour in the liquid metal once they have formed. This would give a better understanding of factors influencing the properties of light metal alloy castings which will lead to the development of improved practices by which healthier castings with reliable and more reproducible properties are obtained.
{"title":"Double oxide film defects and the properties of aluminum castings. A review","authors":"M. A. El-Sayed","doi":"10.37516/global.j.mater.sci.eng.2019.0053","DOIUrl":"https://doi.org/10.37516/global.j.mater.sci.eng.2019.0053","url":null,"abstract":"Entrapped double oxide films are known to be the most detrimental defects in cast aluminium alloys. The research reported here was aimed at surveying the results of previous researches studying how these defects develop with time, with the intention of understanding their behaviour in the liquid metal once they have formed. This would give a better understanding of factors influencing the properties of light metal alloy castings which will lead to the development of improved practices by which healthier castings with reliable and more reproducible properties are obtained.","PeriodicalId":230277,"journal":{"name":"Global Journal of Material Science and Engineering","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123093924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-15DOI: 10.37516/global.j.mater.sci.eng.2019.0054
M. A. El-Sayed
Double oxide films (bifilms) are significant defects in the casting of light alloys, and have been shown to decrease tensile and fatigue properties, and also increase their scatter, making casting properties unreproducible and unreliable. Recent research has suggested that the nature of oxide film defects may change with time, as the air inside the bifilm would react with the surrounding melt leading to its consumption, which may enhance the mechanical properties of Al alloy castings. It was suggested that in a pure Al melt, oxygen within the bifilm atmosphere would be consumed first to form alumina, then nitrogen would react to from AlN. A CFD model of the heat distribution associated with the reactions between the interior atmosphere of a double oxide film defect and the surrounding liquid alloy suggested that highly localized increases in temperature, up to 5000, could occur, over a scale of a few hundred micrometers. Such localized increases in temperature might lead to change the nature of the bifilm causing it to be less harmful to the properties of Al cast alloys.
{"title":"Modelling the temperature change of bifilm defects in Al cast alloys","authors":"M. A. El-Sayed","doi":"10.37516/global.j.mater.sci.eng.2019.0054","DOIUrl":"https://doi.org/10.37516/global.j.mater.sci.eng.2019.0054","url":null,"abstract":"Double oxide films (bifilms) are significant defects in the casting of light alloys, and have been shown to decrease tensile and fatigue properties, and also increase their scatter, making casting properties unreproducible and unreliable. Recent research has suggested that the nature of oxide film defects may change with time, as the air inside the bifilm would react with the surrounding melt leading to its consumption, which may enhance the mechanical properties of Al alloy castings. It was suggested that in a pure Al melt, oxygen within the bifilm atmosphere would be consumed first to form alumina, then nitrogen would react to from AlN. A CFD model of the heat distribution associated with the reactions between the interior atmosphere of a double oxide film defect and the surrounding liquid alloy suggested that highly localized increases in temperature, up to 5000, could occur, over a scale of a few hundred micrometers. Such localized increases in temperature might lead to change the nature of the bifilm causing it to be less harmful to the properties of Al cast alloys.","PeriodicalId":230277,"journal":{"name":"Global Journal of Material Science and Engineering","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134228192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-28DOI: 10.37516/global.j.mater.sci.eng.2019.0038
A. Yakubu, Z. Abbas, S. Sahabi
In this paper, coprecipitation method was used in the synthesis of cobalt ferrite nano particles, while investigations were carried out to determine the effect of sintering temperature on the structural and dielectric properties of the prepared samples. The structural/morphological and dielectric properties of the products were determined by X-raydiffraction (XRD), transmission electron microscopy (TEM), and open ended coaxial probe (OECP). Results from analysis confirms that heat treatment influences the magnitude of dielectric constant and the structural evolution of the samples. TEM mages reveal that the samples surfaces exhibit well-defined crystalline nanoparticles of spherical shapes with small agglomeration at higher sintering temperature while the sizes of the particles increases with annealing temperature due to grain boundary growth. The magnitude of dielectric constant was influenced by interfacial polarization as well as iron hopping of Fe2+ to Fe3+ and Co2+ to Co3+ at B-sites. Sintering temperature also influenced the dielectric characteristics, and this is confirmed from the dielectric measurements at room temperature. Based on the result obtained for dielectric constant, these samples are suitable for small microwave shielding.
{"title":"STRUCTURAL AND DIELECTRIC EVOLUTION OF COBALT FERRITE NANOPARTICLES FOR MICROWAVE APPLICATIONS","authors":"A. Yakubu, Z. Abbas, S. Sahabi","doi":"10.37516/global.j.mater.sci.eng.2019.0038","DOIUrl":"https://doi.org/10.37516/global.j.mater.sci.eng.2019.0038","url":null,"abstract":"In this paper, coprecipitation method was used in the synthesis of cobalt ferrite nano particles, while investigations were carried out to determine the effect of sintering temperature on the structural and dielectric properties of the prepared samples. The structural/morphological and dielectric properties of the products were determined by X-raydiffraction (XRD), transmission electron microscopy (TEM), and open ended coaxial probe (OECP). Results from analysis confirms that heat treatment influences the magnitude of dielectric constant and the structural evolution of the samples. TEM mages reveal that the samples surfaces exhibit well-defined crystalline nanoparticles of spherical shapes with small agglomeration at higher sintering temperature while the sizes of the particles increases with annealing temperature due to grain boundary growth. The magnitude of dielectric constant was influenced by interfacial polarization as well as iron hopping of Fe2+ to Fe3+ and Co2+ to Co3+ at B-sites. Sintering temperature also influenced the dielectric characteristics, and this is confirmed from the dielectric measurements at room temperature. Based on the result obtained for dielectric constant, these samples are suitable for small microwave shielding.","PeriodicalId":230277,"journal":{"name":"Global Journal of Material Science and Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122361101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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