现代机械工程(英文)最新文献_第6页

Steady Free Convection Boundary Layer Flows at a Vertical Plate with Variable Fluid Properties 具有可变流体性质的垂直板上的稳定自由对流边界层流动

现代机械工程(英文) Pub Date : 2017-06-06 DOI: 10.15377/2409-9848.2017.04.01.02

M. Ferdows, Z. Bangalee, Ashish Barmon, R. Quadir

引用次数: 0

02-D Magnetohydrodynamics Boundary Layer Flow of Cu-Ag- TiO3-Al2O3-H2O-C2H6O2 Mixtures: Explicit Numerical and Stability Approach Cu-Ag- TiO3-Al2O3-H2O-C2H6O2混合物的02-D磁流体动力学边界层流动:显式数值和稳定性方法

现代机械工程(英文) Pub Date : 2017-06-06 DOI: 10.15377/2409-9848.2017.04.01.01

M. Ferdows, Don Liu, B. Ramachandran

引用次数: 1

Optimisation of Effective Design Parameters for an Automotive Transmission Gearbox to Reduce Tooth Bending Stress 汽车变速箱有效设计参数优化以减小齿面弯曲应力

现代机械工程(英文) Pub Date : 2017-05-10 DOI: 10.4236/MME.2017.72004

M. Bozca

引用次数: 4

Numerical Study of Heat Transfer and Flow Bifurcation of CuO Nanofluid in Sudden Expansion Microchannel Using Two-Phase Model 基于两相模型的CuO纳米流体在突扩微通道中的传热和流动分叉的数值研究

现代机械工程(英文) Pub Date : 2017-05-10 DOI: 10.4236/MME.2017.72005

F. Abbassi, M. Nazari, M. Shahmardan

{"title":"Numerical Study of Heat Transfer and Flow Bifurcation of CuO Nanofluid in Sudden Expansion Microchannel Using Two-Phase Model","authors":"F. Abbassi, M. Nazari, M. Shahmardan","doi":"10.4236/MME.2017.72005","DOIUrl":"https://doi.org/10.4236/MME.2017.72005","url":null,"abstract":"In this paper, laminar forced convection of CuO nanofluid is numerically investigated in sudden expansion microchannel with isotherm walls and different expansion ratios (ER). An Eulerian two-fluid model is considered to simulate the nanofluid flow inside the microchannel and the governing mass, momentum and energy equations for both phases are solved using the finite volume method. Eulerian-Eulerian two-phase model is very efficient because of considering the relative velocity and temperature of the phases and the nanoparticle concentration distribution. In solving the flow equations for both phases, the SIMPLE algorithm is modified for the coupling of the velocity and pressure and the continuity equations for both phases are combined in order to create the pressure correction equations. However, the Eulerian-Eulerian modeling results show higher heat transfer enhancement in comparison to pure water, so that for a 2% copper-water nanofluid, it has been observed a 35% increase of the heat transfer. The heat transfer enhancement increases with increase in Reynolds number and nanoparticle volume concentration, while the pressure drop increases only slightly. An investigation of the expansion ratio of microchannel shows that the average Nusselt number increases with decrease in expansion ratio as well as with increase in Reynolds number. Also, the Bifurcation has been occurred in higher Reynolds number that is different for each expansion ratio of the microchannel.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"07 1","pages":"57-72"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47691645","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: 5

Influence of Internal Combustion Engine Parameters on Gas Leakage through the Piston Rings Area 内燃机参数对活塞环区域漏气的影响

现代机械工程(英文) Pub Date : 2017-02-06 DOI: 10.4236/MME.2017.71003

W. Momani

引用次数: 1

Coherent Application of a Contact Structure to Formulate Classical Non-Equilibrium Thermodynamics 接触结构在经典非平衡热力学表述中的相干应用

现代机械工程(英文) Pub Date : 2017-02-06 DOI: 10.4236/MME.2017.71002

E. Knobbe, D. Roekaerts

{"title":"Coherent Application of a Contact Structure to Formulate Classical Non-Equilibrium Thermodynamics","authors":"E. Knobbe, D. Roekaerts","doi":"10.4236/MME.2017.71002","DOIUrl":"https://doi.org/10.4236/MME.2017.71002","url":null,"abstract":"This contribution presents an outline of a new mathematical formulation for Classical Non-Equilibrium Thermodynamics (CNET) based on a contact structure in differential geometry. First a non-equilibrium state space is introduced as the third key element besides the first and second law of thermodynamics. This state space provides the mathematical structure to generalize the Gibbs fundamental relation to non-equilibrium thermodynamics. A unique formulation for the second law of thermodynamics is postulated and it showed how the complying concept for non-equilibrium entropy is retrieved. The foundation of this formulation is a physical quantity, which is in non-equilibrium thermodynamics nowhere equal to zero. This is another perspective compared to the inequality, which is used in most other formulations in the literature. Based on this mathematical framework, it is proven that the thermodynamic potential is defined by the Gibbs free energy. The set of conjugated coordinates in the mathematical structure for the Gibbs fundamental relation will be identified for single component, closed systems. Only in the final section of this contribution will the equilibrium constraint be introduced and applied to obtain some familiar formulations for classical (equilibrium) thermodynamics.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"07 1","pages":"8-26"},"PeriodicalIF":0.0,"publicationDate":"2017-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48204555","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

Elastic Bending Deformation of the Drill Strings in Channels of Curve Wells 曲线井中钻柱的弹性弯曲变形

现代机械工程(英文) Pub Date : 2017-02-06 DOI: 10.4236/MME.2017.71001

N. Musa

引用次数: 4

Instantaneous mass flow rate measurements via transfer matrix and modal analysis for an internal combustion engine application 瞬时质量流量测量通过传递矩阵和模态分析的内燃机应用

现代机械工程(英文) Pub Date : 2016-12-20 DOI: 10.15377/2409-9848.2016.03.02.02

D. Chalet, H. Mezher, M. Yassine, J. Migaud, Pierre-Emmanuel Pretot

{"title":"Instantaneous mass flow rate measurements via transfer matrix and modal analysis for an internal combustion engine application","authors":"D. Chalet, H. Mezher, M. Yassine, J. Migaud, Pierre-Emmanuel Pretot","doi":"10.15377/2409-9848.2016.03.02.02","DOIUrl":"https://doi.org/10.15377/2409-9848.2016.03.02.02","url":null,"abstract":"The gas flow through engines is governed by intake and exhaust pipe arrangements. The pressure waves generated at the valves interface interact with the geometry through reflection, transmission and propagation and induce a standing wave action inside the pipes. This in turn causes fluctuations of mass flow at the same characteristic frequencies. Therefore measurement of the unsteady behavior of mass flow is necessary in order to obtain an accurate understanding of the influence of wave action on engine performance and consumption. In this paper, an experimental mass flow impulse technique is employed to characterize dynamic pressure and mass flow inside a pipe equipped with two pressure sensors. The technique is based on a modal decomposition of resonant frequencies which is explained along with the calibration procedure to cover a sufficient frequency spectrum. The result is a transfer matrix formulation written in terms of pressure and mass flow that can be used to calculate instantaneous dynamic mass flow using the two pressure signals. This was done on three engine cases using GT-Power simulations, where the GT-Power mass flow results were compared to the ones given by the experimental transfer matrix. Finally the procedure of applying the transfer matrices methodology for more complex elements of engine is presented and explained. This methodology gives the possibility to measure instantaneous air mass flow rate on a real engine just by using two separate pressure taps anywhere on the line. Only two sensors at fixed positions are necessary without any calibration. Another possibility is to include this kind of transfer matrix in an ECU in order to improve the internal combustion engine control especially for the pollutant emissions reduction.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"3 1","pages":"41-55"},"PeriodicalIF":0.0,"publicationDate":"2016-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67286543","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

Vibration Control of Vehicle Suspension System Using Roadway Profile Information 基于道路轮廓信息的汽车悬架系统振动控制

现代机械工程(英文) Pub Date : 2016-12-20 DOI: 10.15377/2409-9848.2016.03.02.01

Hyo-Jun Kim

引用次数: 0

Design, Manufacture and Measurements of Beta-Type Stirling Engine with Rhombic Drive Mechanism 具有菱形传动机构的β型斯特林发动机的设计、制造与测试

现代机械工程(英文) Pub Date : 2016-11-11 DOI: 10.4236/MME.2016.64012

M. Yunus, M. S. Alsoufi, A. Rathod

{"title":"Design, Manufacture and Measurements of Beta-Type Stirling Engine with Rhombic Drive Mechanism","authors":"M. Yunus, M. S. Alsoufi, A. Rathod","doi":"10.4236/MME.2016.64012","DOIUrl":"https://doi.org/10.4236/MME.2016.64012","url":null,"abstract":"The purpose of carrying out present work is to design, build and test a rhombic drive Stirling engine with a β-type configuration consisting of two dynamic pistons (displacer and power) reciprocates in the in-line concentric cylinder arrangement. The displacement rod is assembled concentrically inside the power piston rod. The rhombic drive mechanism is proposed in such a way that, by using a pair of gear wheels the sliding motion of both piston rods is controlled and thus, an engine is balanced. The developed prototype has a swept volume of 75 cm3 with the displacer piston and power piston cylinder hot ends heated by liquefied petroleum gas (LPG) burner and cooled water, respectively. It uses air as the working gas at atmospheric pressure for initial charging of the engine. Several designs were studied before settling on a β-type configuration. The LPG gas burner was considered as a potential heat source. The various elements of an engine (heater, cooler, re-generator, flywheel and piping systems) were designed, constructed and analyzed. The testing results revealed that the engine at initial atmospheric air filling started working in only about 120 seconds at an LPG heater temperature of 400℃ (824°F) with 280 rpm. At a heater temperature of 550℃ (1022°F), the engine speed was 630 rpm. At the engine speed of 245 rpm, the maximum torque was 0.215 Nm, while the maximum power was 8 Watts at 355 rpm. Engine speed increased with the increase of flame temperature. Several tests were performed on the engine to improve its running efficiency and critical problem areas were isolated and addressed. Moreover, results revealed that Stirling engines working with relatively low-temperature air are potentially attractive engines of the future, especially LPG powered low temperature differential Stirling engines. The Stirling engine was capable of generating between 50 to 100 Watts of electricity.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"06 1","pages":"113-128"},"PeriodicalIF":0.0,"publicationDate":"2016-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497272","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: 4