Annales De Chimie-science Des Materiaux最新文献

{"title":"MHD flow of viscoelastic nanofluid over a stretching sheet in a porous medium with heat source and chemical reaction","authors":"K. Swain, S. K. Parida, G. C. Dash","doi":"10.3166/ACSM.42.7-21","DOIUrl":"https://doi.org/10.3166/ACSM.42.7-21","url":null,"abstract":"The present study investigates the heat and mass transfer of MHD viscoelastic (Walters’ B’ model) nanofluid flow over a stretching sheet embedded in a saturated porous medium subject to thermal slip and temperature jump. A simulation model is established through the analysis on relevant constraints such as stretching of bounding surface keeping the origin fixed and thermal slip and temperature jump on the boundary. The numerical solutions are obtained by Runge-Kutta fourth order method with shooting technique. The affects of important thermo-physical parameters on the velocity, temperature, concentration and surface criteria are displayed and analyzed through graphs and tables. As a result of the analysis, the following observations are made. Elasticity of the base fluid in the presence of nanoparticle acts adversely to the growth of velocity as well as thermal boundary layers. Brownian diffusion, thermophoresis and heat source enhance the fluid temperature resulting the cooling of the stretching surface. Further, positive values of heat and mass fluxes for different values of elastic, magnetic and permeability parameters indicate that heat and mass transfer occur from the stretching surface to the fluid. These recommendations are useful to limit the parameters to design viable heat exchangers. RÉSUMÉ. La présente étude examine le transfert de chaleur et de masse du flux de nanofluide viscoélastique MHD (modèle de Walters) sur une feuille d’étirement encastrée dans un milieu poreux saturé soumis au glissement thermique et au saut de température.Un modèle de simulation est établi par l’analyse de contraintes pertinentes, telles que l’étirement de la surface de délimitation en maintenant l’origine, le glissement thermique et le saut de température sur la limite.Les solutions numériques sont obtenues par la méthode de l’ordre quatre de Runge-Kutta avec technique d’injection. Les effets d'importants paramètres thermophysiques sur les critères de vitesse, de température, de concentration et de surface sont présentés et analysés au moyen de graphiques et de tableaux. À la suite de l'analyse, les observations suivantes sont faites.L'élasticité du fluide de base en présence de nanoparticules agit négativement sur la croissance de la vitesse ainsi que sur les couches limites thermiques. 8 ACSM. Volume 42 – n° 1/2018 La diffusion brownienne, la thermophorèse et la source de chaleur augmentent la température du fluide, ce qui entraîne le refroidissement de la surface d’étirement.En outre, des valeurs positives des flux de chaleur et de masse pour différentes valeurs de paramètres élastiques, magnétiques et de perméabilité indiquent que des transferts de chaleur et de masse ont lieu de la surface d’étirement au fluide.Ces recommandations sont utiles pour limiter les paramètres permettant de concevoir des échangeurs de chaleur viables.","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"1 1","pages":"7-21"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90507133","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}

{"title":"A case study on heat source mechanism of high-temperature geothermal field","authors":"J. Ba, Chuntian Su, Yanqing Li","doi":"10.3166/acsm.42.129-147","DOIUrl":"https://doi.org/10.3166/acsm.42.129-147","url":null,"abstract":"The heat source mechanism is vital to the activity of high-temperature geothermal field. This paper analyses the intrusion era, scale and temperature of magma chamber and the radiation heat of basal granite in Ruidian geothermal field, a typical constrained heat source dominated by magma chamber in southwestern China. The analysis results show that: an intrusive high-temperature magma chamber was formed in Late Pleistocene in GudongMazhan Belt, southern Yunnan Province; the magma chamber was an approximate ellipsoid with a 19km-long east-west axis, a 25km-long north-south axis, a 15km-height, and a highest temperature of 700°C. The basement of this geothermal field is biotite adamellite rich in radioactive elements (e.g. 238U, 232Th and 40K). The mean decay heat generation rate stands at 6.90μW/m and the estimated temperature is 116~120°C at the depth of 2km. In addition, the said magma chamber is the main heat source, whose radiogenic heat contributes to the temperature distribution of Ruidian high-temperature geothermal field. In this way, the author discovered the formation mechanism of Ruidian high temperature geothermal field, laying a solid basis for further research on heat source mechanism of geothermal fields. RÉSUMÉ. Le mécanisme de source de chaleur est essentiel à l'activité du champ géothermique à haute température. Cet article analyse l’époque de l’intrusion, l’échelle et la température de la chambre magmatique et la chaleur de radiation du granite basal dans le champ géothermal de Ruidian, une source de chaleur contrainte typique dominée par la chambre magmatique dans le sud-ouest de la Chine. Les résultats de l'analyse montrent que: une chambre magmatique intrusive à haute température s'est formée au Pléistocène supérieur dans la zone de Gudong – Mazhan, dans le sud de la province du Yunnan; la chambre magmatique était un ellipsoïde approximatif avec un axe est-ouest de 19 km de long, un axe nord-sud de 25 km, une hauteur de 15 km et une température maximale de 700°C. Le sous-sol de ce champ géothermique est constitué d’adamellite biotite riche en éléments radioactifs (par exemple 238U, 232Th et 40K). Le taux moyen de génération de chaleur de désintégration est de 6,90 μW/m3 et la température estimée est de 116~120°CC à une profondeur de 2 km.En outre, ladite chambre magmatique est la principale source de chaleur, dont la chaleur radiogénique contribue à la répartition de la température du champ géothermique à haute température de Ruidian. De cette façon, l'auteur a découvert le mécanisme de formation du champ géothermique à haute température de Ruidian, posant ainsi une base solide pour la poursuite des recherches sur le mécanisme de source de chaleur des champs géothermiques. 130 ACSM. Volume 42 – n° 1/2018","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"4 1","pages":"129-147"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75053503","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}

{"title":"Preparation of silicon-based nanowires through high-temperature annealing","authors":"S. Xi, S. Zuo, L. Ying, Zhu Yinlong, Yutu Yang, Gou Binli","doi":"10.3166/ACSM.42.149-158","DOIUrl":"https://doi.org/10.3166/ACSM.42.149-158","url":null,"abstract":"This paper explores the effects of process parameters on the structure and morphology of silicon-based nanowires. Specifically, the substrate of silicon was annealed at high temperature or with a metal catalyst, such that numerous silicon-based nanowires were grown on the silicon wafer. Through the adjustment of process parameters, SiO2 nanowires, Si3N4 nanowires and SiOxNy nanowires were produced with different morphologies. The process parameters that affect the final structure were determined as the carrier gas for annealing, the type of metal catalyst and the substrate surface. After that, the morphology of the nanowires was characterized by scanning electron microscopy (SEM), the composition of the nanowires was tested by energy dispersive X-ray spectroscopy (EDS), and the relationship between the microstructure of the nanowires and various parameters was analyzed by transmission electron microscopy (TEM). The results show that the Si3N4 nanowires and SiOxNy nanowires are single crystals requiring harsh preparing processes, while SiO2 nanowires were amorphous and have low requirements on the growth environment. In addition, the optical properties of SiO2 nanowire film and SiOxNy nanowire film were characterized, proving their ultra-bright whiteness. The research findings lay the theoretical basis for the controlled growth of silicon-based nanowires, and provide a simple and efficient method for batch growth of nanowires. RÉSUMÉ. Cet article explore les effets des paramètres de processus sur la structure et la morphologie des nanofils en silicium. Plus précisément, le substrat de silicium a été recuit à haute température ou avec un catalyseur métallique, de sorte que de nombreux nanofils en silicium ont été développés sur la plaquettes de silicium. Grâce à l'ajustement des paramètres de processus, des nanofils de SiO2, de Si3N4 et de SiOxNy ont été produits avec différentes morphologies. Les paramètres du procédé qui affectent la structure finale ont été déterminés en tant que gaz vecteur du recuit, type de catalyseur métallique et surface du substrat. Après cela, la morphologie des nanofils a été caractérisée par microscopie électronique à balayage (MEB en anglais), la composition des nanofils a été testée par l’analyse dispersive en énergie (EDS en anglais) et la relation entre la microstructure des nanofils et divers paramètres a été analysée par la microscopie électronique en transmission (MET en anglais). Les résultats montrent que les nanofils Si3N4 et les nanofils SiOxNy sont des monocristaux nécessitant un processus de préparation rigoureux, tandis que les nanofils SiO2 sont amorphes et ont de faibles exigences en matière de croissance. De plus, les propriétés optiques des films de 150 ACSM. Volume 42 – n° 1/2018 nanofils de SiO2 et de SiOxNy ont été caractérisées, prouvant leur blancheur ultra-brillante. Les résultats de la recherche jettent les bases théoriques de la croissance contrôlée des nanofils en silicium et constituent une m","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"47 1","pages":"149-158"},"PeriodicalIF":0.8,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78390674","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}

{"title":"Characterization of Pbs/PMMA nanocomposite films elaborated by direct inclusion method","authors":"A. Chelouche, Abdenour Ait-Atmane, L. Hammiche, D. Djouadi, T. Touam, B. Boudine","doi":"10.3166/acsm.40.143-148","DOIUrl":"https://doi.org/10.3166/acsm.40.143-148","url":null,"abstract":"","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"1 1","pages":"143-148"},"PeriodicalIF":0.8,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86556874","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}

{"title":"Influence de la concentration en tellure sur le mécanisme de durcissement structural de l'alliage plomb-tellure pour les grilles de batterie","authors":"Abdellah Aguizir, Elhassan Zantalla, Y. Yassine, Najim Selhaoui, L. Bouirden","doi":"10.3166/ACSM.40.121-130","DOIUrl":"https://doi.org/10.3166/ACSM.40.121-130","url":null,"abstract":"","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"9 1","pages":"121-130"},"PeriodicalIF":0.8,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75642003","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}

{"title":"Caractérisation d’un carbure cémenté contenant 11% en masse de cobalt élaboré par compression isostatique à chaud : Etude de la réactivité de la gaine en acier avec le composant WC","authors":"Hassiba Rabouhi, S. Boudrahem, A. Khireddine","doi":"10.3166/acsm.40.111-120","DOIUrl":"https://doi.org/10.3166/acsm.40.111-120","url":null,"abstract":"","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"67 1","pages":"111-120"},"PeriodicalIF":0.8,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90660768","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}

{"title":"Microstructure et adhérence interfaciale des revêtements en acier inoxydable obtenus par projection thermique","authors":"Abdellah Sadki, R. Younes, M. Bradai, M. L. Hattali, N. Mesrati","doi":"10.3166/acsm.40.131-142","DOIUrl":"https://doi.org/10.3166/acsm.40.131-142","url":null,"abstract":"","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"34 1","pages":"131-142"},"PeriodicalIF":0.8,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85187485","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}

{"title":"How to control the structural properties of purely ciliceous MCM-41","authors":"T. Ali-Dahmane, L. Brahmi, R. Hamacha, Abdelkader Sak, B. Cieniek","doi":"10.3166/ACSM.40.149-163","DOIUrl":"https://doi.org/10.3166/ACSM.40.149-163","url":null,"abstract":"","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"13 1","pages":"149-163"},"PeriodicalIF":0.8,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87481764","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}

{"title":"Raman spectra analysis of carbon layers on magnesium alloys","authors":"Marcin Golabcszak","doi":"10.3166/ACSM.40.1-8","DOIUrl":"https://doi.org/10.3166/ACSM.40.1-8","url":null,"abstract":"","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"15 6","pages":"1-8"},"PeriodicalIF":0.8,"publicationDate":"2016-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72602834","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}

{"title":"Size distribution of nucleation substrates for AI-Cu alloy: theoretical calculation and simulation of crystalization process","authors":"J. Lelito, B. Gracz, P. Żak, M. Szucki, P. Malinowski, J. Suchy","doi":"10.3166/ACSM.40.87-94","DOIUrl":"https://doi.org/10.3166/ACSM.40.87-94","url":null,"abstract":"","PeriodicalId":7897,"journal":{"name":"Annales De Chimie-science Des Materiaux","volume":"186 1","pages":"87-94"},"PeriodicalIF":0.8,"publicationDate":"2016-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80620906","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}