Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)最新文献

Growth Control of SnO2 Nanoparticles Using a Low-Temperature Solution Process 低温溶液法控制SnO2纳米颗粒生长

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.sol.033127

Catlin Ethridge, Lucas Splingaire, Holly Korte, U. Schnupf, Kazuhiro Manseki, T. Sugiura, S. Vafaei

{"title":"Growth Control of SnO2 Nanoparticles Using a Low-Temperature Solution Process","authors":"Catlin Ethridge, Lucas Splingaire, Holly Korte, U. Schnupf, Kazuhiro Manseki, T. Sugiura, S. Vafaei","doi":"10.1615/tfec2020.sol.033127","DOIUrl":"https://doi.org/10.1615/tfec2020.sol.033127","url":null,"abstract":"Perovskite solar cells, specifically using SnO 2 nanoparticles, have been extensively researched and are proving to be extremely promising in the field of renewable energy by increasing a solar cell’s overall efficiency and lowering the cost of production. In this study, an experiment was performed to synthesize SnO 2 nanoparticles over 8 days. Day 1 was the synthesis which included the mixing of water, tin (II) chloride, methanol, sodium carbonate and dimethylformamide and then heated in a water bath at 28 𝐶 𝑜 . Sampling of this solution started on day 4 of the experiment when sufficient particle growth was observed and stopped at day 8. Centrifuging, freezing, and freeze-drying were used for each sample to isolate the solid product. Transmission electron microscopy and X-ray powder diffraction was used to characterize the isolated nanoparticle. The results from the X-ray powder diffraction showed that each sample consisted of SnO 2 nanoparticles of different sizes. From the transmission electron microscopy on the samples showed that the overall size of the nanoparticles gradually increased during each additional synthesis day.","PeriodicalId":434777,"journal":{"name":"Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)","volume":"257 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":"132811544","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

An Excellent SCCHP Design Project in Thermal-fluids Education 热流体教育中一项优秀的SCCHP设计项目

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.edu.031336

Yongjian Gu

{"title":"An Excellent SCCHP Design Project in Thermal-fluids Education","authors":"Yongjian Gu","doi":"10.1615/tfec2020.edu.031336","DOIUrl":"https://doi.org/10.1615/tfec2020.edu.031336","url":null,"abstract":"Thermodynamics, fluid mechanics, and heat transfer are three core courses playing key roles in thermal-fluids education. For students majoring in thermal-fluids, a senior design project is usually assigned to train them knowing how and where these course knowledge is applied in engineering. The project should be proper and practical, not only to boost design interests of the students, but also to help their future career development. In the paper, the author describes a design project, solar-assisted combined cooling, heating, and power (SCCHP) plant, which is designed per author’s many year experience of professional work in consulting companies and teaching in colleges. The SCCHP plant is composed of a solar heating system including solar energy collectors and a high efficiency heat exchanger, a steam power system including a steam turbine, cooling tower, and condenser, and the cooling and heating of the HVAC system including an absorption/compression chiller, a cooling tower, and an air handling unit (AHU). The students apply the knowledge of thermodynamics, fluid mechanics, and heat transfer to understand the plant working principle and perform the heat balance calculation. In the paper, the author illustrates the design procedure and presents sketches of the SCCHP plant and the subsystems of solar heating, steam power, and cooling and heating of HVAC. The equations of thermodynamics, fluid mechanics, and heat transfer for calculation and analysis are described, respectively. The design project of the SCCHP plant has been used partially or completely for a few years. It has been highly appreciated by the students, even after their graduation when they were working in companies.","PeriodicalId":434777,"journal":{"name":"Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)","volume":"13 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":"132278074","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

INVESTIGATION ON CHAR RESIDUES AND MEAN REACTIVITY OF COMPRESSION MOLDED RICE AND COFFEE HUSKS BIO-CHAR REINFORCED POLYPROPYLENE 稻壳、咖啡壳压缩成型生物炭增强聚丙烯的残炭及平均反应性研究

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.cbf.032093

V. A. Yiga, M. Lubwama, P. Olupot

{"title":"INVESTIGATION ON CHAR RESIDUES AND MEAN REACTIVITY OF COMPRESSION MOLDED RICE AND COFFEE HUSKS BIO-CHAR REINFORCED POLYPROPYLENE","authors":"V. A. Yiga, M. Lubwama, P. Olupot","doi":"10.1615/tfec2020.cbf.032093","DOIUrl":"https://doi.org/10.1615/tfec2020.cbf.032093","url":null,"abstract":"Fiber-reinforced plastics have gained utilization in recent years for many applications because they are a cheaper alternative to the ordinary petroleum-derived materials. On the other hand, considerable amounts of agricultural wastes still lack enough utilization. In this study, bio-chars of husks from two rice and two coffee varieties in Uganda were utilized as fillers to reinforce polypropylene (PP) and thus develop fiber-reinforced plastics. Bio-char filler material was varied between 0 % and 20 %. The plastics were prepared via melt mixing followed by compression molding. Effects of bio-char content on the thermal stability of the developed plastics were studied by use of an Eltra Thermostep Thermogravimetric analyzer. Thermogravimetric analysis (TGA) results showed that inclusion of biochar improved the thermal stability of the developed fiber-reinforced plastics. Maximum rate of weight loss ranged from -0.0414 %/min (for 15 % unmodified Wita -9 rice bio-char) to 0.0023 %/min (for pure PP), corresponding to respective peak temperatures of 680.8 ° C and 604 ° C respectively. Peak temperatures generally increased with increase in filler loading. It was found out by this study that incorporation of bio-char fiber material resulted in increased char residues. These residues tended to hinder combustion. The highest char residues (17.4 %) were obtained when PP was loaded with 15 % neutral Wita-9 rice husks bio-char. The highest mean reactivity attained was 6.1×10 -5 %/minute/ ° C obtained when 10 % unmodified Pussa rice husks bio-char was used to reinforce PP. bio-chars as filler Pre-treatment of the bio-chars was onset by use of NaOH. Thermal properties of the developed fiber-reinforced PP were determined using an Eltra Thermostep Thermogravimetric analyzer.","PeriodicalId":434777,"journal":{"name":"Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)","volume":"42 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113979904","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: 6

INFLUENCE OF CNT-NANOPARTICLES IN THE FILTRATE CHARACTERISTICS AND FILTER CAKE FORMATION OF A WATER-BASED DRILLING FLUID 纳米碳纳米管对水基钻井液滤液特性及滤饼形成的影响

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.env.032112

Anoop Kanjirakat, A. Carvero, R. Sadr, M. Amani

引用次数: 0

A MULTIPHASE, RIEMANN-SOLVER APPROACH TO GAS-CAVITATION 气穴化的多相、黎曼求解方法

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.mph.031923

Andris Rambaks, H. Murrenhoff, K. Schmitz

引用次数: 0

SIMULATION OF NATURAL CONVECTION IN A SQUARE CAVITY WITH PARTIALLY HEATED AND COOLED VERTICAL WALLS 垂直壁面部分加热和部分冷却的方形空腔内自然对流的模拟

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.cmd.032123

E. Selamet, A. Selamet, R. Dehner

引用次数: 0

BIFURCATION PHENOMENA IN THE SHORT TAYLOR-COUETTE CAVITY WITH THE ASYMMETRIC END-WALLS AT LOW Re 低Re下端壁不对称的短TAYLOR-COUETTE腔中的分岔现象

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.fli.032358

E. Tuliszka-Sznitko

引用次数: 0

A MANY-BODY DISSIPATIVE PARTICLE DYNAMICS STUDY OF COALESCENCE INDUCED JUMPING 聚结诱导跳跃的多体耗散粒子动力学研究

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.cmd.031803

Ting Liu, A. Mishra, A. Hemeda, J. Palko, Yanbao Ma

{"title":"A MANY-BODY DISSIPATIVE PARTICLE DYNAMICS STUDY OF COALESCENCE INDUCED JUMPING","authors":"Ting Liu, A. Mishra, A. Hemeda, J. Palko, Yanbao Ma","doi":"10.1615/tfec2020.cmd.031803","DOIUrl":"https://doi.org/10.1615/tfec2020.cmd.031803","url":null,"abstract":"Coalescence induced jumping from solid surface at mesoscale is simulated using Many-body dissipative particle dynamics (MDPD). The geometrical evolution during the coalescence of two droplets and resulted jumping were obtained and the mechanism behind this phenomenon were also investigated. The jumping maps two equal-sized droplets and two droplets with different sizes were obtained. It is found the coalescence of two equal size droplets will lead to jumping when the contact angle is larger than the minimum threshold contact angle, which is about 160°. This minimum threshold contact angle is related to droplet size as it increases when droplet size decreases. Jumping can still happen when two droplets with different sizes merge together. The maximum volume ratio for jumping of two droplets with different sizes is 3.9. Velocity field shows how internal flow evolves during the coalescence process. There is obvious velocity change inside the droplet from the beginning of the droplet deformation to jumping. The energy conversion rate from released surface energy to kinetic energy is found about 1%. These results can greatly advance the fundamental understanding of hydrodynamics behavior of coalescence induced droplet jumping.","PeriodicalId":434777,"journal":{"name":"Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)","volume":"31 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":"121405526","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

Mechanical properties of thermally stable cadmium iodoapatite ceramic by reactive spark plasma sintering technique 反应放电等离子烧结技术制备热稳定的碘磷灰石镉陶瓷的力学性能

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.aes.032443

I. Islam, Fengyuan Lu

{"title":"Mechanical properties of thermally stable cadmium iodoapatite ceramic by reactive spark plasma sintering technique","authors":"I. Islam, Fengyuan Lu","doi":"10.1615/tfec2020.aes.032443","DOIUrl":"https://doi.org/10.1615/tfec2020.aes.032443","url":null,"abstract":"Apatites based materials have been considered as potential waste forms to immobilize the long-lived radioactive iodine isotope. But the thermal instability and phase decomposition at a higher temperature hamper the waste management process. Spark plasma sintering can be a suitable technique compared to conventional sintering processes due to its rapid heating rate, lower sintering temperature and holding time. In this study, we synthesized a highly dense iodine bearing cadmium iodoapatite ceramic pellets by spark plasma sintering (SPS) technique. We successfully consolidated iodoapatite pellets with ~95.5% of theoretical density (TD) without any iodine loss and phase decomposition after low temperature sintering at 350 o C for 15 mins under 100 MPa. The theoretical density, micro-hardness, and yield strength of sintered pellets were investigated for different sintering temperatures of 300 o C, 350 o C, and 400 o C and holding time (15 min) under the pressure of 100 MPa. The densified pellets displayed nanocrystalline grain structures of 30-80 nm size which contributed to enhanced thermal stability and fracture toughness. The X-ray diffraction and EDS analysis also confirms the presence of iodoapatite structures. This advanced fabrication technique using SPS can help to develop thermally durable waste forms and mitigate the challenges to dispose high- level radioactive waste.","PeriodicalId":434777,"journal":{"name":"Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)","volume":"4 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":"130942451","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: 1

THE SWIRLING MOTION OF DRIBBLING HONEY 滴蜂蜜的旋转运动

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC) Pub Date : 1900-01-01 DOI: 10.1615/tfec2020.fnc.031576

M. Molki

引用次数: 0