EngRN: Chemical Engineering最新文献

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Material Selection and Fluid Flow Analysis of Parallel Flow Heat Exchanger 平行流换热器的材料选择与流体流动分析

EngRN: Chemical Engineering Pub Date : 2016-12-01 DOI: 10.9734/acri/2016/30239

C. E. Okafor, Alex Dubem Tagbo, O. Obiafudo, E. Nwadike

{"title":"Material Selection and Fluid Flow Analysis of Parallel Flow Heat Exchanger","authors":"C. E. Okafor, Alex Dubem Tagbo, O. Obiafudo, E. Nwadike","doi":"10.9734/acri/2016/30239","DOIUrl":"https://doi.org/10.9734/acri/2016/30239","url":null,"abstract":"Aims: To select appropriate material and undertake fluid flow analysis of parallel flow heat exchanger. \u0000Methodology: Dynamic simulation study was performed to evaluate conditions of heat transfer of water through heat exchanger using ASPEN HYSYS. Cambridge Education Selector (CES) Granta software was used to select the suitable candidate materials for the heat exchanger. The properties of the selected materials and fluid characteristics were implemented in Computational Fluid Dynamics (CFD) to solve and analyze the fluid flow. \u0000Results: For inner pipe, low alloy steel having maximum thermal conductivity of 55(W/m°C) and specific heat capacity of 530 (J/kg°C) respectively was selected and used. For the outer pipe, cast iron, gray having thermal conductivity of 72 (W/m°C) and specific heat capacity of 495(J/kg°C) passed the selection criteria and was used.The total heat transfer surface area and hydraulic diameter was determined as 0.1341634m2 and 0.481m respectively while the velocity of flow (V) for hot and cold fluid was established as 0.00014518 m/sec and 0.000196817 m/sec respectively. \u0000Conclusion: The material-process decision on a parallel flow heat exchanger design was reduced to trade-off between performance and cost. The data obtained from the experimental record are well matched with computational fluid dynamics simulated values at different mass flow rate.","PeriodicalId":421505,"journal":{"name":"EngRN: Chemical Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126348773","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}

引用次数: 0

Bonding Effectiveness Study of the Universal Adhesive on Caries-Affected Dentin of Deciduous Teeth 通用胶粘剂对乳牙龋病牙本质粘接效果的研究

EngRN: Chemical Engineering Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3673614

Qiang Sun, C. Shu, Chengze Wang, Mengying Shi, Jiajia Xu, Qiaojie Luo, Mengjie Wu, Yadong Chen, Xiaodong Li

{"title":"Bonding Effectiveness Study of the Universal Adhesive on Caries-Affected Dentin of Deciduous Teeth","authors":"Qiang Sun, C. Shu, Chengze Wang, Mengying Shi, Jiajia Xu, Qiaojie Luo, Mengjie Wu, Yadong Chen, Xiaodong Li","doi":"10.2139/ssrn.3673614","DOIUrl":"https://doi.org/10.2139/ssrn.3673614","url":null,"abstract":"Aim: The aim of this study was to investigate the bonding effectiveness of the universal adhesive on caries-affected dentin and normal dentin of deciduous teeth. <br><br>Methods Extracted twelve second deciduous molars with one adjacent surface carious were collected. The half teeth with caries adjacent surface were grouped into the caries-affected group (Group test), while the caries-free half were grouped into the control group (Group control). For the Group test, carious tissue was removed with slow speed ball drill under the indication of caries maker.For the Group control, at the other side of the occlusal surface sound dentin was prepared to the similar deep level. Single bond Universal adhesive system using self-etch strategies was applied following the manufacturer's instructions.The defective part was filled with Shofu Beautifil II Namer, a commonly used resin composite in pediatric dentistry. Vertical sticks were obtained and subjected to tensile stress test. The morphology of the bonding surfaces were observed by scanning electron microscope and transmission electron microscopy.<br><br>Results: Electron microscope observation showed that there was no significant difference in morphology between caries-affected dentin and normal dentin. The minerals and smear layer were removed after acid etching, and the collagen network of dentin tubules and inter tubular dentin was exposed. There was no significant difference in the micro-tensile strengths between Group test and Group control (P > 0.05). Conclusion In vitro, caries-affected deciduous tooth dentin could achieve similar bonding strength to normal tooth dentin when Single Bond Universal adhesive was applied.","PeriodicalId":421505,"journal":{"name":"EngRN: Chemical Engineering","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129841728","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}

引用次数: 0

Cerium as a Possible Stabilizer of ThMn 12-Type Iron-Based Compounds: A First-Principles Study 铈作为thm12型铁基化合物可能的稳定剂:第一性原理研究

EngRN: Chemical Engineering Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3446974

Y. Harashima, T. Fukazawa, T. Miyake

引用次数: 1