International Journal of Engineering - Transactions C: Aspects最新文献_第6页

Implementation of D3Q19 Lattice Boltzmann Method with a Curved Wall Boundary Condition for Simulation of Practical Flow Problems 具有曲面壁边界条件的D3Q19晶格玻尔兹曼方法在实际流动问题模拟中的实现

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-07-07 DOI: 10.5829/idosi.ije.2017.30.09c.11

E. Ezzatneshan

{"title":"Implementation of D3Q19 Lattice Boltzmann Method with a Curved Wall Boundary Condition for Simulation of Practical Flow Problems","authors":"E. Ezzatneshan","doi":"10.5829/idosi.ije.2017.30.09c.11","DOIUrl":"https://doi.org/10.5829/idosi.ije.2017.30.09c.11","url":null,"abstract":"In this paper, implementation of an extended form of a no-slip wall boundary condition is presented for the three-dimensional (3-D) lattice Boltzmann method (LBM) for solving the incompressible fluid flows with complex geometries. The boundary condition is based on the off-lattice scheme with a polynomial interpolation which is used to reconstruct the curved or irregular wall boundary on the neighboring lattice nodes. This treatment improves the computational efficiency of the solution algorithm to handle complex geometries and provides much better accuracy comparing with the staircase approximation of bounce-back method. The efficiency and accuracy of the numerical approach presented are examined by computing the fluid flows around the geometries with curved or irregular walls. Three test cases considered herein for validating the present computations are the flow calculation around the NACA0012 wing section and through the two different porous media in various flow conditions. The study shows the present computational technique based on the implementation of the three-dimensional Lattice Boltzmann method with the employed curved wall boundary condition is robust and efficient for solving laminar flows with practical geometries and also accurate enough to predict the flow properties used for engineering designs.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79999313","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

Parametric Study of Movement Path in Two-dimensional Wing Flow Separation: Experimental Investigation 二维翼流分离运动路径参数化研究:实验研究

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-07-07 DOI: 10.5829/ije.2017.30.09c.13

M. D. Manshadi, A. Mostofizadeh, M. A. Jozvaziri

{"title":"Parametric Study of Movement Path in Two-dimensional Wing Flow Separation: Experimental Investigation","authors":"M. D. Manshadi, A. Mostofizadeh, M. A. Jozvaziri","doi":"10.5829/ije.2017.30.09c.13","DOIUrl":"https://doi.org/10.5829/ije.2017.30.09c.13","url":null,"abstract":"The aim of this experimental study is two-dimensional investigation of cargo behavior after separation which is carried out in the subsonic wind tunnel. Given that the real separation occurs in three-dimension, the results of this study may be widely used in numerical aerodynamic studies for verification of new computational methods and they can be used as the reference results in this area. So a mechanism has been used which is simulated in two-dimensional physic with three degrees of freedom (x, y, θ) in the subsonic wind tunnel. A wing with NACA0012 airfoil as well as two circular disks at both ends (to simulate two-dimensional flow) have been utilized and separated from the upper surface of the test chamber. For parametric study, the tests have been experimented in the initial attack angles of -10 to +10 degrees with step of 5 degrees at velocity of 15 m/s and at velocities of 10, 15 and 20 m/s at zero degree initial angle of attack. Each test has been repeated 3 times and if there were any differences in the results, the number of repetitions have been increased. To extract the result, several cameras have been installed around the test chamber which take pictures with high-speed shooting. Then, using image processing techniques, x, y, and θ diagrams have been extracted over the time.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90728152","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

Detailed Scheduling of Tree-like Pipeline Networks with Multiple Refineries 多炼油厂树状管网的详细调度

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-06-16 DOI: 10.5829/ije.2017.30.12c.08

M. Taherkhani, R. Tavakkoli-Moghaddam, M. Seifbarghy, P. Fattahi

引用次数: 3

Numerical Survey of Vibrational Model for Third Aircraft based on HR Suspension System Actuator Using Two Bee Algorithm Objective Functions 基于双蜜蜂算法目标函数的HR悬架作动器第三飞机振动模型数值研究

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-04-21 DOI: 10.5829/ije.2017.30.06c.09

A. Toloei, M. Zarchi, B. Attaran

引用次数: 5

Investigation of the Forming Force in Torsion Extrusion Process of Aluminum Alloy 1050 1050铝合金扭转挤压成形力的研究

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-04-21 DOI: 10.5829/ije.2017.30.06c.13

V. Modanloo, V. Alimirzaloo

引用次数: 6

Incorporated Poly Acrylic Acid-co-Fe3O4 Nanoparticles Mixed Matrix Polyethersulfone based Nanofiltration Membrane in Desalination Process 聚丙烯酸-co- fe3o4纳米颗粒混合基质聚醚砜基纳滤膜在海水淡化中的应用

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-04-21 DOI: 10.5829/ije.2017.30.06c.01

E. Bagheripour, A. Moghadassi, S. Hosseini

{"title":"Incorporated Poly Acrylic Acid-co-Fe3O4 Nanoparticles Mixed Matrix Polyethersulfone based Nanofiltration Membrane in Desalination Process","authors":"E. Bagheripour, A. Moghadassi, S. Hosseini","doi":"10.5829/ije.2017.30.06c.01","DOIUrl":"https://doi.org/10.5829/ije.2017.30.06c.01","url":null,"abstract":"Polyethersulfone (PES) based nanocomposite nanofiltration membrane was prepared by immersion precipitation method and casting solution technique using poly (acrylic acid) grafted-iron oxide nanoparticles (Fe3O4) as hydrophilic filler additives. For this purpose, iron oxide nanoparticles were modified by in situ polymerization of acrylic acid in aqueous solution by potassium persulfate as initiator and ethylene glycol as cross-linker. The grafted iron oxide nanoparticles were investigated by Fourier transforms infrared spectroscopy. The effect of different concentrations of grafted nanoparticles on the PES nanofiltration membrane performance and properties was investigated by scanning electron microscopy, water content, pure water flux, pore size, permeability flux, rejection and tensile strength. The water content was enhanced by incorporation of nanoparticles into the membrane matrix from 72.04 to 74.75%. It was observed that pure water flux (2.68 to 8.71 L/m2.h), mean pore size (2 to 6 nm) and permeability flux (0.8 to 4 L/m2.h) improved with loading of nanoparticles into the membrane matrix. The results revealed that utilization of grafted iron oxide nanoparticles in the membrane matrix led to improvement of rejection from 53.98 to 89.19% for membrane filled with 0.05% wt. nanoparticles. Also tensile strength increased slightly for sample 1 from 3874 to 4825 kPa for sample 4. Moreover, results showed more appreciation performance for the modified membrane containing PAA-Fe3O4 composite nanofillers compared to membrane filled with bare Fe3O4 nanoparticles.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91378345","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: 11

Bertrand-nash Equilibrium in the Retail Duopoly Model under Asymmetric Costs 非对称成本下零售业双寡头模型中的Bertrand-nash均衡

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-04-21 DOI: 10.5829/ije.2017.30.06c.06

S. Melnikov

引用次数: 1

HYDRAULIC NETWORK MODELING TO ANALYZE STREAM FLOW EFFECTIVENESS ON HEAT TRANSFER PERFORMANCE OF SHELL AND TUBE HEAT EXCHANGERS 利用水力网络建模分析管壳式换热器的流动效率对换热性能的影响

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-04-21 DOI: 10.5829/ije.2017.30.06c.11

S. Jafarmadar, A. Tahery, S. Khalilarya

{"title":"HYDRAULIC NETWORK MODELING TO ANALYZE STREAM FLOW EFFECTIVENESS ON HEAT TRANSFER PERFORMANCE OF SHELL AND TUBE HEAT EXCHANGERS","authors":"S. Jafarmadar, A. Tahery, S. Khalilarya","doi":"10.5829/ije.2017.30.06c.11","DOIUrl":"https://doi.org/10.5829/ije.2017.30.06c.11","url":null,"abstract":"In this article, stream flow effectivness is based on hydraulic network studied in the shell-side of a shell and tube heat exchange as a case study. For an appropriate heat exchangers rating design to meet a specified duty, it's better to consider each stream flow separately. Using the hydraulic network principals, a set of the correlations for calculating different stream flow rates in the cross and window area, leakage from tube-bundle and shell-baffle bypass are suggested. By the presented correlations, the actual flow direction and different stream flow rates of shell-side fluid for calculating of shell-side heat transfer and pressure drop in different regions between adjacent baffles has been taken into account. Also, the effects of each stream flow in each baffle section on the overall heat transfer coefficient (HTC) and pressure drop could be investigated. The comparison results of using these correlations and results of published values, like Bell-Delaware method and Kern correlations, is reasonable, which can be used in the optimum design of shell and tube heat exchangers with segmental baffles. Also, according to the results, the cross flow stream show much better heat transfer performance with lower pressure drop behavior than window stream at the same mass flow rates. Average heat transfer performance of window-section is almost 7-12% of overall heat transfer performance for studied case study. doi: 10.5829/ije.2017.30.06c.11","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91106500","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: 2

Embedded Memory Test Strategies and Repair 嵌入式内存测试策略与修复

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-04-21 DOI: 10.5829/ije.2017.30.06c.03

M. A. Ahmed, D. Rani, S. A. Sattar

引用次数: 9

Effective Design of a 3×4 Two Dimensional Distributed Amplifier Based on Gate Line Considerations 基于门线考虑的3×4二维分布式放大器的有效设计

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-04-21 DOI: 10.5829/ije.2017.30.06c.02

A. H. Mogheyse, H. M. Naimi

{"title":"Effective Design of a 3×4 Two Dimensional Distributed Amplifier Based on Gate Line Considerations","authors":"A. H. Mogheyse, H. M. Naimi","doi":"10.5829/ije.2017.30.06c.02","DOIUrl":"https://doi.org/10.5829/ije.2017.30.06c.02","url":null,"abstract":"In this paper two dimensional wave propagation is used for power combining in drain nodes of a distributed amplifier (DA). The proposed two dimensional DA uses an electrical funnel to add the currents of drain nodes. The proposed structure is modified due to gate lines considerations. Total gain improvement is achieved by engineering the characteristic impedance of gate lines and also make appropriate variation in the output of gain cells. All variations are done with respect to input and output reflection loss considerations. Analytical expression for the gain of the proposed DA is presented and design considerations for electrical funnel are discussed. Based on two dimensional power combining a wide band DA is simulated using TSMC 0.18 CMOS model in ADS which consumes 49.42 mw from 1.2V power supply. Good agreement between the proposed DA gain and calculated value is achieved. Although one stage DA is used, the final results yield a high figure of merit (FOM) in 0.18 CMOS technology. The final design shows 11.1 dB gain from near DC to 23.6 GHz, noise figure between 3 to 5.2dB and maximum output power of 7.1dBm at 1-dB output compression point (OP1dB). doi: 10.5829/ije.2017.30.06c.02","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77092406","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