NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech最新文献

{"title":"Liquid and gas optical flowmeter model development","authors":"O. Y. Semenov, A. I. Dyomko","doi":"10.1063/1.5122153","DOIUrl":"https://doi.org/10.1063/1.5122153","url":null,"abstract":"The article presents the flow rate measuring method in accordance with the rectangular pipe transverse temperature gradient variation. The possibility of studying the heat exchange regularities under the natural convection is considered. Laser beam angular deviation dependence on the flow rate is investigated. The pipe temperature distribution is found to be inhomogeneous relative to the air flow velocity. The possibility of developing the laser flow meter for measuring the low gas consumption is demonstrated. The proposed method application limits are determined.The article presents the flow rate measuring method in accordance with the rectangular pipe transverse temperature gradient variation. The possibility of studying the heat exchange regularities under the natural convection is considered. Laser beam angular deviation dependence on the flow rate is investigated. The pipe temperature distribution is found to be inhomogeneous relative to the air flow velocity. The possibility of developing the laser flow meter for measuring the low gas consumption is demonstrated. The proposed method application limits are determined.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116432751","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":"Vacuum boiler efficiency improvement","authors":"E. N. Slobodina, A. Mikhailov","doi":"10.1063/1.5122085","DOIUrl":"https://doi.org/10.1063/1.5122085","url":null,"abstract":"The paper represents the recommendations for the vacuum boiler boiling process intensification by applying the flame tube finning in the form of the cross fins and a slot gap between fins not exceeding the liquid capillary constant value to develop a new design of the high-efficient vacuum boiler. The fundamental principles of the vacuum boiler thermal calculation mathematical model are presented. The computational studies results with the use of the RPI model of the software suite ANSYS CFX are shown.The paper represents the recommendations for the vacuum boiler boiling process intensification by applying the flame tube finning in the form of the cross fins and a slot gap between fins not exceeding the liquid capillary constant value to develop a new design of the high-efficient vacuum boiler. The fundamental principles of the vacuum boiler thermal calculation mathematical model are presented. The computational studies results with the use of the RPI model of the software suite ANSYS CFX are shown.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126196219","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":"Nanostructured titanium coatings for parts operating under conditions of fretting-corrosion","authors":"D. Korotaev, E. Eremin, K. N. Poleschenko, P. V. Orlov, E. V. Ivanova","doi":"10.1063/1.5122138","DOIUrl":"https://doi.org/10.1063/1.5122138","url":null,"abstract":"The article proposes an improved system of ion-plasma modification based on the use of three cathodes installed at different angles. Using the methods of scanning electron microscopy and energy dispersion analysis, the authors study the morphology, the composition of elements and the coating structure in terms of titanium nitride formed by ion-plasma modification with a change in processing time. They find that there is no drop phase of metallic titanium, adversely affecting the mechanical properties in the coating formed on the studied technological regimes of ion-plasma processing. An experimental assessment of the destruction of nanostructured ion-plasma coatings on the structural parts of pipeline fittings operating under fretting corrosion is carried out.The article proposes an improved system of ion-plasma modification based on the use of three cathodes installed at different angles. Using the methods of scanning electron microscopy and energy dispersion analysis, the authors study the morphology, the composition of elements and the coating structure in terms of titanium nitride formed by ion-plasma modification with a change in processing time. They find that there is no drop phase of metallic titanium, adversely affecting the mechanical properties in the coating formed on the studied technological regimes of ion-plasma processing. An experimental assessment of the destruction of nanostructured ion-plasma coatings on the structural parts of pipeline fittings operating under fretting corrosion is carried out.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130887051","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":"Rational methods for processing of chromia-alumina catalyst","authors":"I. Voitov, O. V. Lastovetskaya, V. A. Borisov","doi":"10.1063/1.5122037","DOIUrl":"https://doi.org/10.1063/1.5122037","url":null,"abstract":"The possibility to utilize one of the types of bulky wastes from oil refineries – spent chromia-alumina catalyst (SCAC) for dehydrogenation of low-molecular hydrocarbons – was considered. Methods for recycling of the spent catalyst were analyzed and implemented, namely, leaching with a NaOH excess, sintering with NaOH, and sintering of the catalyst with Na2CO3. Sintering with Na2CO3 was shown to be the most efficient method of SCAC processing because the stripping degree reached 92%. The alkaline filtrate treated with H2O2 was carbonized by carbon dioxide to recover Al2O3 with trace amounts of Cr. After evaporation of the chromate solution, sodium chromate containing 0.04-0.5% Al was recovered.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128646970","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 study of iron modification of the alumina-supported Pt/SO4/ZrO2 catalysts for isomerization of n-hexane","authors":"L. I. Bikmetova, K. V. Kazantsev, E. Zatolokina, M. Smolikov, A. Belyi","doi":"10.1063/1.5122046","DOIUrl":"https://doi.org/10.1063/1.5122046","url":null,"abstract":"The study is devoted to the modifying effect of manganese, which is introduced at different stages of the synthesis from different precursors, on the performance of n-hexane isomerization in the presence of supported Pt/SZ/Al2O3(Mn) catalysts. It was shown that the addition of Mn essentially affects the acidic properties of catalysts and catalytic performance in n-hexane isomerization.The study is devoted to the modifying effect of manganese, which is introduced at different stages of the synthesis from different precursors, on the performance of n-hexane isomerization in the presence of supported Pt/SZ/Al2O3(Mn) catalysts. It was shown that the addition of Mn essentially affects the acidic properties of catalysts and catalytic performance in n-hexane isomerization.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128255014","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":"Effect of ultrasonic impact treatment on mechanical properties of 3D-printed Ti-6Al-4V titanium alloy parts","authors":"S. Panin, Y. Pochivalov, O. Perevalova, E. Sinyakova, M. Kazachenok, O. Evtushenko, D. Buslovich, A. O. Buyluk","doi":"10.1063/1.5122131","DOIUrl":"https://doi.org/10.1063/1.5122131","url":null,"abstract":"Changes of the microstructure and phase composition of selective laser melting Ti-6Al-4V titanium alloy samples during ultrasonic impact post-processing were investigated by optical, transmission microscopy, and X-ray analysis. Significant refinement of the microstructure in the thin surface layer was observed as a result of ultrasonic impact treatment. This causes an increase in microhardness and strength characteristics of the surface layer of selective laser melting samples under uniaxial tension.Changes of the microstructure and phase composition of selective laser melting Ti-6Al-4V titanium alloy samples during ultrasonic impact post-processing were investigated by optical, transmission microscopy, and X-ray analysis. Significant refinement of the microstructure in the thin surface layer was observed as a result of ultrasonic impact treatment. This causes an increase in microhardness and strength characteristics of the surface layer of selective laser melting samples under uniaxial tension.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122050629","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":"Analysis of temperature effect on deformation of low-speed compressor unit stage cylinder","authors":"I. Aistov, K. Vansovich, S. Busarov, Y. Panin, D. Titov","doi":"10.1063/1.5122052","DOIUrl":"https://doi.org/10.1063/1.5122052","url":null,"abstract":"The article analyzes the stress-strain state of a low-speed stage cylinder of a long-stroke piston compressor unit with consideration of the wall’s temperature. The conducted calculations allow the optimal design of a piston compressor stage under temperature loads, considering real gaps in the cylinder-piston seal in the deformed state.The article analyzes the stress-strain state of a low-speed stage cylinder of a long-stroke piston compressor unit with consideration of the wall’s temperature. The conducted calculations allow the optimal design of a piston compressor stage under temperature loads, considering real gaps in the cylinder-piston seal in the deformed state.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124382470","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":"Analysis of the thermal efficiency of solid and vacuum thermal insulation in an exchanger of the heat losses recovery system in mobile compressor units","authors":"V. Yusha, G. Chernov, A. Kalashnikov","doi":"10.1063/1.5122119","DOIUrl":"https://doi.org/10.1063/1.5122119","url":null,"abstract":"In this work, the developed methodology for the numerical analysis of the working process in the flow part of the recuperative shell-and-tube heat exchanger was tested and a comparative analysis of heat losses was carried out for different variants of external thermal insulation of the shell. According to the results of previous studies, solid insulation materials (mineral wool, basalt super fine fiber, polyethylene foam, foamed rubber, polyurethane foam) and vacuum and screen vacuum insulation were selected for the analysis.The analysis of working processes in the considered heat exchanger was carried out using a calculation technique based on the equations of thermal conductivity, convective heat exchange and heat exchange by radiation, as well as equations describing the motion of gas and liquid and their phase changes, contained in the ANSYS Fluent package. When modeling heat exchange processes, the following boundary conditions were are specified: the hot air inlet temperature Th is equal to 550 °C; water temperature at the inlet of the Tw is 10 °C; external ambient temperature Tex is 0 °C. The heat transfer coefficient α between the environment and the outer surface of the heat exchanger was assumed to be constant.According to the results of computational studies, we can draw the following conclusions: with regard to the object under consideration, thermal insulation allows reducing the amount of heat losses from 23% to ∼4%; The smallest losses from the investigated range of insulation are achieved using screen-vacuum insulation and its modification using screens of various degrees of blackness and quantity; for each type of insulation, as its thickness increases, losses are stabilized at a certain level, which leads to the absence of the need to increase the insulation thickness over 15 mm; even a 2 mm thermal insulation layer can significantly reduce heat loss; screening efficiency decreases with increasing number of screens (with a thermal insulation thickness of 20 mm, the efficiency of screen-vacuum insulation is approximately comparable to the efficiency of vacuum insulation with the same depth of vacuum).In this work, the developed methodology for the numerical analysis of the working process in the flow part of the recuperative shell-and-tube heat exchanger was tested and a comparative analysis of heat losses was carried out for different variants of external thermal insulation of the shell. According to the results of previous studies, solid insulation materials (mineral wool, basalt super fine fiber, polyethylene foam, foamed rubber, polyurethane foam) and vacuum and screen vacuum insulation were selected for the analysis.The analysis of working processes in the considered heat exchanger was carried out using a calculation technique based on the equations of thermal conductivity, convective heat exchange and heat exchange by radiation, as well as equations describing the motion of gas and liquid and their phase changes, contained ","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114293938","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":"The effect of palladium addition to sulfated zirconia catalysts on physicochemical and catalytic properties in the n-hexane isomerization reaction","authors":"O. V. Dzhikiya, M. Smolikov, K. V. Kazantsev, S. S. Yablokova, O. E. Podmareva, A. Belyi","doi":"10.1063/1.5122022","DOIUrl":"https://doi.org/10.1063/1.5122022","url":null,"abstract":"The effect of palladium introduction into SO4/ZrO2 catalysts on their textural and acidic properties, phase composition and catalytic performance in isomerization of n-hexane was studied. It was shown that Pd/SO4/ZrO2−Al2O3 catalysts are highly active and selective toward the formation of mono- and dimethylsubstituted isomers of hexane.The effect of palladium introduction into SO4/ZrO2 catalysts on their textural and acidic properties, phase composition and catalytic performance in isomerization of n-hexane was studied. It was shown that Pd/SO4/ZrO2−Al2O3 catalysts are highly active and selective toward the formation of mono- and dimethylsubstituted isomers of hexane.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122267555","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":"Synthesis and study of Mg(Ni, Co, Li)Al-LDH prepared by mechanochemical method","authors":"L. N. Stepanova, O. Belskaya, A. V. Vasilevich, N. N. Leont’eva, A. Salanov, V. Likholobov","doi":"10.1063/1.5122032","DOIUrl":"https://doi.org/10.1063/1.5122032","url":null,"abstract":"MgAl-, NiAl-, CoAl and LiAl- layered double hydroxides (LDH) were prepared by mechanochemical method. The conditions of mechanochemical synthesis of the single phase LDH with specified composition were optimized. It was shown that application of the steel milling bodies allowed carrying out of the synthesis in the most severe conditions (acceleration 1000 m s−2, time of activation 30 minutes) and promoted deeper reaction between initial components. It was found that for the synthesis of single-phase MgAl-, NiAl- and CoAl-LDH, the corresponding metal hydroxides and sodium carbonate should be used, and to obtain LiAl-LDH, aluminum hydroxide and lithium nitrate should be selected as initial reagents.MgAl-, NiAl-, CoAl and LiAl- layered double hydroxides (LDH) were prepared by mechanochemical method. The conditions of mechanochemical synthesis of the single phase LDH with specified composition were optimized. It was shown that application of the steel milling bodies allowed carrying out of the synthesis in the most severe conditions (acceleration 1000 m s−2, time of activation 30 minutes) and promoted deeper reaction between initial components. It was found that for the synthesis of single-phase MgAl-, NiAl- and CoAl-LDH, the corresponding metal hydroxides and sodium carbonate should be used, and to obtain LiAl-LDH, aluminum hydroxide and lithium nitrate should be selected as initial reagents.","PeriodicalId":377067,"journal":{"name":"NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127131111","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}