Progress in Canadian Mechanical Engineering. Volume 3最新文献_第6页

The Effects of Multilayer Porous Media on the Efficiency of Filtration Combustion 多层多孔介质对过滤燃烧效率的影响

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.109

A. Lavrentev, A. Tarokh

{"title":"The Effects of Multilayer Porous Media on the Efficiency of Filtration Combustion","authors":"A. Lavrentev, A. Tarokh","doi":"10.32393/csme.2020.109","DOIUrl":"https://doi.org/10.32393/csme.2020.109","url":null,"abstract":"Diffusion filtration combustion in a radiative jet burner is numerically investigated. This study focuses on the effects of the porous media structure on the efficiency of nonpremixed combustion, namely combustion temperature and NOx emissions. For this investigation, methane-air combustion within a two-layer porous media is considered. Twodimensional axisymmetric model is chosen to reduce the number of elements and the corresponding computational resource requirements. Fluid turbulence is resolved using the kω SST turbulence model, while the turbulence-controlled reaction rates are computed using the eddy dissipation model. Stoichiometric, two-step methane-air reaction is utilized in the reaction zone. In the present model both thermal and prompt NOx formation mechanisms are considered, where an extended Zeldovich mechanism is used for thermal NOx formation. For high combustion temperatures where radiative heat flux is larger than that of convection and conduction heat transfer rates, radiation becomes the dominant heat transfer mode. To account for the emission and scattering of thermal radiation by the porous media, the Discrete Ordinate model is considered. The relationship between velocity and pressure corrections is calculated using the SIMPLE algorithm. The layered porous zone arrangement is utilized to increase combustion performance due to enhanced fuel-air mixing through increased heat recirculation within the multilayer porous media. Utilizing two layers of equal height, ɛ=0.6 and 0.45, upstream and downstream, respectively increased combustion temperature while decreasing combustion zone and NOx emission. Additionally, the effects of the thickness of each layer on combustion efficiency are studied. Increasing the height of the low porosity downstream region, which effectively decreases the height of the upstream high porosity region, resulted in increased NOx emissions due to higher temperature in the combustion zone. Keywordsnon-premixed, diffusion filtration combustion, methane-air combustion, porous media","PeriodicalId":184087,"journal":{"name":"Progress in Canadian Mechanical Engineering. Volume 3","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127554489","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 Optimization Method to Find the Initial Catenary Configuration by Using a Gradient-Based Algorithm 基于梯度的悬链线初始构型优化方法

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.107

Kee Seung Oh, Rosalie Morin, B. Shiff, S. Roper, I. Kim

引用次数: 1

Geothermal Cooling for Data Centers 数据中心地热冷却

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.98

Mojtaba Zabihi, Ri Li, Sai Ram Chanduri, Ali Reza Pak Nezhad

{"title":"Geothermal Cooling for Data Centers","authors":"Mojtaba Zabihi, Ri Li, Sai Ram Chanduri, Ali Reza Pak Nezhad","doi":"10.32393/csme.2020.98","DOIUrl":"https://doi.org/10.32393/csme.2020.98","url":null,"abstract":"Though geothermal heating and cooling systems are widely used to cater the commercial and residential needs, their use in data center cooling is highly limited. Due to the absence of a heating loop, high thermal impedance of the soil, and the continuous need for cooling, geothermal systems have significant challenges to serve the data center cooling needs. Considering these limitations, this paper investigates the possibility of developing a geothermal cooling system for a 250 kW data center. The proposed cooling model utilizes underground as a heat sink, and the heat is transferred from the server room to the underground relentlessly. Air-water heat exchangers installed at the rack-level, exchange the heat between the hot server room air and the cold water circulated from the underground geothermal well system. A numerical model is developed to analyze this heat rejection process, with the focus on the thermal performance of the geothermal-well system. This system is analyzed under steady-state and transient conditions. An analytical approach is used to study the thermal steady state of the system, and a numerical approach is used for the transient state. The results suggest that it is not feasible to operate the system under steady-state conditions, due to the high thermal resistance of the soil. Also, they imply that the heat transferred through a single well is insignificant, and hence, a multiple geothermal well system is developed. The thermal performance of this well system is used to infer the feasibility of developing a geothermal cooling solution for data centers.","PeriodicalId":184087,"journal":{"name":"Progress in Canadian Mechanical Engineering. Volume 3","volume":"27 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131726489","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

Mechanically Dynamic Scaffolds for Enhanced Anterior Cruciate Ligament Reconstruction 机械动力支架增强前交叉韧带重建

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.81

Jean-Gabriel Lacombe, M. Cooke, H. Park, J. Ramirez-Garcialuna, David Slawaska-Eng, F. Almarek, D. Rosenzweig, P. Martineau

{"title":"Mechanically Dynamic Scaffolds for Enhanced Anterior Cruciate Ligament Reconstruction","authors":"Jean-Gabriel Lacombe, M. Cooke, H. Park, J. Ramirez-Garcialuna, David Slawaska-Eng, F. Almarek, D. Rosenzweig, P. Martineau","doi":"10.32393/csme.2020.81","DOIUrl":"https://doi.org/10.32393/csme.2020.81","url":null,"abstract":"Close to a quarter of a million ACL injuries occur each year in Canada and the United States. These injuries can result in reduced functional performance and are associated with long-term clinical conditions that include meniscal tears, chondral lesions and an increased risk of early onset osteoarthritis (OA). Surgical reconstruction is the current gold standard of care for ACL injuries. However, surgical treatment is costly and associated with high risk of post-traumatic OA within two decades of injury. Researchers have explored tissue engineering (TE) to address these shortcomings and have developed degradable graft materials that can guide functional connective tissue formation. However, scaffolds fabricated using TE methods still do not accurately mimic the anisotropic architecture and biomechanical properties of the ACL. Furthermore, the biological graft remodeling process causes significant reductions in tensile properties of the tissue-engineered scaffolds, which adds complexity to the design of such structures. Our hypothesis is that reductions in mechanical properties can be minimized by enclosing the scaffold in an artificial semi-permeable membrane and incubating it in vivo prior to ACL surgical reconstruction. A low-cost ACL scaffold was additively manufactured via fused deposition modeling using LAY-FOMM material (thermoplastic polyurethanes co-polymer with polyvinyl alcohol). Scaffolds replicating the anatomical dimensions of the ACL were printed on a Flashforge Creator Pro 3D Printer and evaluated for mechanical properties such as tensile strength, strain at failure, compression strength and Young’s modulus. Second, the scaffolds","PeriodicalId":184087,"journal":{"name":"Progress in Canadian Mechanical Engineering. Volume 3","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123298269","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

A Comparison of Lightweight Design Concepts of a Passenger Aircraft Seat Using Topology and CFRP Laminate Optimization 基于拓扑优化和复合材料优化的客机座椅轻量化设计概念比较

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.104

L. Kupchanko, S. Roper, Haksung Lee, Mongyoung Huh, I. Kim

引用次数: 6

Isothermal Modeling of Perforated Duct Diffusers (PDD) 多孔管道扩散器(PDD)的等温建模

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.99

Peyman Raphe, H. Fellouah, M. Ameur

引用次数: 0

HAB Hunter

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.1205

Joshua J. Creelman, Gabryelle C. H. Beland, Benjamina Murphy, M. Tavasoli, A. Furlong, J. Laroche, Robert Beiko, James Dean-Moore, Vincent J. Sieben

引用次数: 0

Air-LUSI Air-LUSI

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.1224

A. Newton, S. Maxwell, S. Gadsden, K. Turpie

引用次数: 1

Comparative Analysis of Rainfall with Estimated Evapotranspiration using Recurrent Neural Networks 降雨与估算蒸散量的递归神经网络对比分析

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.1210

Hassan Afzaal, A. Farooque, F. Abbas, B. Acharya, T. Esau

{"title":"Comparative Analysis of Rainfall with Estimated Evapotranspiration using Recurrent Neural Networks","authors":"Hassan Afzaal, A. Farooque, F. Abbas, B. Acharya, T. Esau","doi":"10.32393/csme.2020.1210","DOIUrl":"https://doi.org/10.32393/csme.2020.1210","url":null,"abstract":"Evapotranspiration (ET) is key element in water balance as well as surface energy equation. Accurate estimation of ET provides useful information for water resource management, irrigation planning and crop sustainability. This study estimates the reference evapotranspiration (ET) with recurrent neural networks (RNN) namely long short term memory (LSTM) and Bidirectional LSTM. Four meteorological stations (North Cape, Summerside, Harrington and Saint Peters) were selected in Prince Edward Island. A new dataset namely PEI was computed by averaging climatic variables from all four sites to capture climatic variability from all parts of the province. The highest contributing climatic variables namely maximum air temperature and relative humidity were selected based on subset regression analysis as input variable for training (2011-2015) and testing (2016-2017) sets. The results suggested that the LSTM and Bidirectional LSTM are suitable methods to estimate reference ET with considerable accuracy as R 2 > 0.90 for test set (2016-2017) for all site except Harrington. Testing period (2016-2017) root mean square errors were recorded in range of 0.38-0.58 mm/day for all sites. No major differences were observed in accuracy of LSTM and Bidirectional LSTM. Another objective of this study was to highlight the potential gap between reference ET and rainfall for agriculture sustainability in Prince Edward Island. The data from 2011-2017 highlights that the reference ET surpasses the rainfall affecting potential yield of major crops in the island. Viable options such as supplemental irrigation may needed to replenish the crop water requirements in drier months for agriculture sustainability.","PeriodicalId":184087,"journal":{"name":"Progress in Canadian Mechanical Engineering. Volume 3","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124763466","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

Application and Comparison of Nonlinear Estimation Strategies on a Magnetorheological Hysteretic Force Model 磁流变滞回力模型非线性估计策略的应用与比较

Progress in Canadian Mechanical Engineering. Volume 3 Pub Date : 2020-09-01 DOI: 10.32393/csme.2020.1153

Andrew S. Lee, S. Gadsden

引用次数: 0