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SURFACE ROUGHNESS analysis IN HIGH SPEED-DRY TURNING OF A TOOL STEEL

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10th asme biennial conference on engineering systems design and analysis

作者： Vaxevanidis, N. M. Galanis, N. I. Petropoulos, G. P. Karalis, N. Vasilakakos, P. Sideris, J. Sch Pedag & Technol Educ Dept Mech Engn Educators GR-14121 N Heraklion Attikis Greece

ISBN: (纸本)9780791849156

High-speed machining is widely applied for the processing of lightweight materials and also structural and tool steels. these materials are intensively used in the aerospace and the automotive industries. the advantages of high-speed machining lie not only in the speed of machining (lower costs and higher productivity) but also in attaining higher surface quality (prescribed surface roughness without surface defects). Based on this concept, in the present paper the high speed-dry turning of AISI O, (manganese-chromium-tungsten / W.-Nr. 1.2510) tool-steel specimens is reported. the influence of the main machining parameters i.e., cutting speed, feed rate and depth of cut on the resulted center-line average surface roughness (R-a) is examined. Types of wear phenomena occurred during the course of the present experimental study as well as tool wear patterns were also monitored.

关键词： Surface quality Turning Aerospace industry Cutting Wear Machining Tungsten Surface roughness Tool steel

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thERMODYNAMIC analysis OF A COMBINED POWER AND WATER PRODUCTION SYSTEM

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10th asme biennial conference on engineering systems design and analysis

作者： Shakib, S. Ehsan Amidpour, Majid Aghanajafi, Cyrus KNT Univ Technol Dept Mech Engn Tehran Iran

ISBN: (纸本)9780791849156

Most of the potable water and electricity are produced by dual purpose plants. Dual-purpose plants are the one that supplies heat for a thermal desalination unit and produces electricity for distribution to the electrical grid. In this paper a power plant is combined with a multi-effect evaporation thermal vapor compression (METVC) system. Compared with the most widely used (Multi Stage Flash) MSF desalination, METVC has more advantages. then, energy and exergy analysis equations for desalination plant, power generation cycle, heat recovery steam generator and combined power and water cycle are developed and the results are presented. Results show by rising number of effect from 2 to 14, performance ratio, exergy efficiency and specific heat transfer area rise steadily. For combined system, the maximum and minimum values of exergy destruction rate are related to combustion chamber and desalination effects, respectively. Also, with increasing TIT, exergy destruction rate of power generation cycle decreases while the exergy destruction rate of METVC, especially thermo compressor, goes up and fresh water production reduces dramatically.

关键词： Exergy analysis Manufacturing systems Heat Exergy Power stations Vapors Energy generation Cycles Specific heat Power grids Combustion chambers Evaporation Water Compressors Heat recovery steam generators Compression

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thERMALLY DEVELOPING 3D CROSS FLOW BETWEEN CROSS CORRUGATED PARALLEL PLATES IN EVAPORATIVE COOLERS

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10th asme biennial conference on engineering systems design and analysis

作者： Tavakoli, Ehsan Hosseini, Reza Amir Kabir Univ Technol Dept Mech Engn Tehran Iran

ISBN: (纸本)9780791849163

the 3D cross flow between parallel corrugated plates with perpendicular directions of corrugation is numerically modeled as a laminar, incompressible, steady flow. the present work tries to investigate the thermally developing characteristics of the flow in this type of geometry, in the case of constant temperature on walls. the main emphasis is on introducing correlations for saturation efficiency and simply modeling the evaporation process within evaporative coolers with such geometries. the applied numerical method is the Chorin's artificial incompressibility method and finite difference discretization is used to model the Navier-Stokes and energy equations in a structured mesh. the results show that saturation efficiency decreases with increase in Reynolds number this also depends on the depth of evaporative media along the flow direction. Increasing the number of waves along the flow direction, results higher saturation efficiencies and also more pressure drop. For a specific saturation efficiency, the overall pressure drop decreases at higher amplitude to wavelength ratios. Also the overall pressure drop grows as the depth of the domain increases. the same trend is observed for experimental data of commercial evaporative pads.

关键词： Reynolds number Flow (Dynamics) Pressure drop Temperature Wavelength Plates (structures) Modeling Numerical analysis Cross-flow Waves Geometry Coolers Evaporation

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EXPERIMENTAL AND NUMERICAL analysis OF FATIGUE PROPERTIES IMPROVEMENT IN A TITANIUM ALLOY BY SHOT PEENING

EXPERIMENTAL AND NUMERICAL ANALYSIS OF FATIGUE PROPERTIES IM...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Bagherifard, Sara Giglio, Marco Giudici, Lorenzo Guagliano, Mario Politecn Milan Dept Mech Engn I-20156 Milan Italy

ISBN: (纸本)9780791849163

Shot peening (SP) is a mechanical surface treatment commonly performed to improve the fatigue behavior through creation of compressive residual stresses close to surface and work hardening of the surface material. Notwithstanding wide application of shot peening in the industrial environment, the determination of optimal peening condition for Ti alloys is still more an art than a science, taking into account that there is not a well established method to choose the process parameters in order to enhance the fatigue behavior. In this paper a comprehensive numerical and experimental study is presented aimed at finding the optimized peening conditions based on characterization of surface layer of material after multiple impacts. the numerical simulations provide a quantitative description of shot peening effects in terms of residual stress field and thickness of work-hardened surface layer Comparison with numerical results, obtained by means of X-ray diffraction (XRD), shows a very good correspondence. Finally the results of experimental bending fatigue tests, performed on shot peened specimens by means of Rumul Cracktronics machine, confirm that shot peening significantly increases the fatigue strength of the considered Titanium alloy.

关键词： shot peening (SP) finite element residual stresses Titanium fatigue strength

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EFFECT OF VISCOUS DISSIPATION ON HEAT TRANSFER BETWEEN TWO CONCENTRIC CYLINDERS FOR CARREAU FLUIDS

EFFECT OF VISCOUS DISSIPATION ON HEAT TRANSFER BETWEEN TWO C...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Amoura, Meriem Zeraibi, Noureddine Univ Sci & Technol Houari Boumed Fac Phys Dept Energet Bab Ezzouar 16111 Alger Algeria

ISBN: (纸本)9780791849163

In this paper, we present a numerical study of the flow characteristics and heat transfer mechanism of a non-Newtonian fluid in an annular space between two coaxial rotating cylinders taking into account the effect of viscous dissipation. the Carreau stress-strain relation was adopted to model the rheological fluid behavior. the problem is studied when the heated inner cylinder rotates around the common axis with constant angular velocity and the cooled outer cylinder is at the rest. the horizontal endplates are assumed adiabatic. In-house code which is based on a Galerkin mixed finite element is developed to obtain numerical solutions of the complete governing equations and associated boundary conditions and is validated with the results reported in the literature. It is found that five parameters can describe the problem under consideration, the Reynolds number(Re), the Grashof number (Gr), the index of structure (n), Weissenberg number (We) and the Eckert number (Ec). the velocity, temperature and stream function distributions and the local Nusselt number variations are drawn for different dimensionless groups.

关键词： Heat transfer Flow (Dynamics) Finite element analysis Stress-strain relations Non-Newtonian fluids Fluids Reynolds number Boundary-value problems Rheology Energy dissipation Temperature Cylinders

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Finite Element Modeling of Spleen Tissue to Analyze Its Interaction with a Laparoscopic Surgery Instrument

引用

10th asme biennial conference on engineering systems design and analysis

作者： Tirehdast, Mojdeh Mirbagheri, Alireza Farahmand, Farzam Asghari, Mohsen Sharif Univ Technol Dept Mech Engn Tehran Iran

ISBN: (纸本)9780791849187

Laparoscopic surgery is a Minimally Invasive Surgery (MIS) procedure which is performed in the abdominal cavity. In this paper, the spleen tissue and a laparoscopic surgical grasper were modeled using ABAQUS software to investigate the tool-tissue interaction, considering large deformations for the spleen tissue. the spleen tissue was modeled as a hyper-elastic material. the laparoscopic grasper includes three gripping jaws that always remain parallel. the sliding can occur between the gripping jaws and the spleen tissue. It was found that the relationship between the pinch forces and push forces keeps its linearity in different values of friction coefficient (0-0.3). the pushing force varies from 0 (N) in pinch force of 1 (N) and the frictionless situation to 6.125 (N) in pinch force of 6 (N) and the friction coefficient equal to 0.3. Changing the shape of jaws can increase the pushing force up to 100%. the results could help surgeons to predict the correlation between grasping conditions and applied forces for a safe grasping procedure in the laparoscopic operations.

关键词： Finite element analysis Computer software Deformation Surgical tools Grasping Modeling Biological tissues Shapes Cavities Pinch effect Friction Surgery

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Investigation of Exergy Destruction Based on Avoidable and Unavoidable Concepts for Helical Coils

Investigation of Exergy Destruction Based on Avoidable and U...

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10th asme biennial conference on engineering systems design and analysis

作者： Bahiraee, Farid Salehzadeh, Aidin Saray, Rahim Khoshbakhti Sahand Univ Technol Dept Mech Engn Tabriz Iran

ISBN: (纸本)9780791849156

An inevitable problem challenges heat exchanger designers is that the heat transfer augmentation in a thermal system is always achieved at the expense of an increase in pressure loss. thus, the optimal trade-off by choosing the most proper configuration and best flow condition has become the critical problem for design work. the brief survey on literature shows that optimal Reynolds number (i.e. the Reynolds number which corresponds to minimum entropy generation) of laminar forced convection in a helical tube, was specified based on minimum entropy generation. therefore, the present study analyzes the thermodynamic potential of improvement for steady, laminar, fully developed, forced convection in a helical coiled tube subjected to uniform wall temperature based on the concept of avoidable and unavoidable exergy destruction. the influence of coil curvature ratio, dimensionless inlet temperature difference, dimensionless passage length of the coil, and fluid properties on avoidable exergy destruction have been investigated for water as working fluid. Results show considerable potential of thermodynamic optimization of helical coil tubes. Also, in the range of present study a relation for determining the amount of

关键词： Heat transfer Heat exchangers Optimization Flow (Dynamics) Pressure Water thermal systems Fluids Wall temperature Reynolds number Entropy design Tradeoffs thermodynamic potentials Exergy Forced convection Temperature

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design OF NOVEL NANOCOMPOSITE NITRIDE COATINGS FOR SEVERE TRIBOLOGICAL APPLICATIONS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Erdemir, A. Eryilmaz, O. L. Urgen, M. Kazmanli, M. K. Ezirmik, V. Argonne Natl Lab Div Energy Syst Argonne IL 60439 USA

ISBN: (纸本)9780791849156

Nanocomposite coatings have lately been attracting a lot of attention mainly because of their superior mechanical and tribological properties even under very severe operating conditions (such as high loads, speeds, temperatures, starved or marginal lubrication, etc.). these coatings may consist of multiple crystalline and/or amorphous phases that make them truly composite and hence multi-functional. In this paper, we primarily focus on the chemical and structural design of such coatings for superior friction and wear properties under lubricated sliding conditions that are typical of various engine applications. As an innovative approach for the design of such coatings, we employed a crystal-chemical model that can be very useful for the selection of right kinds of coating ingredients that are essential for their unique structures and superior property and performance characteristics under severe tribological conditions. Novel MoNx-Cu coatings produced according to this model could provide friction coefficients as low as 0.04 under boundary lubricated sliding regimes and they could not be scuffed or worn through under the heaviest loading conditions of a block-on-ring test machine.

关键词： Engines Machinery Performance characterization Temperature Lubrication Composite materials Crystals Nanocomposites design Stress Wear Friction Coatings Structural design Tribology

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FINITE ELEMENT SIMULATION OF NON-ISOthERMAL FLUID FLOW PAST A STAGGERED TUBE BANK

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10th asme biennial conference on engineering systems design and analysis

作者： Alavi, S. Mahmood Aboulhasan Islamic Azad Univ Dept Engn Mashhad Branch Tehran Iran

ISBN: (纸本)9780791849187

In this paper the two-dimensional, non-isothermal fluid flow past a staggered tube bank is analyzed numerically by the finite element method. the flow is assumed to be incompressible, laminar and unsteady. To stabilize the discretized equations of the continuity and momentum, the streamline upwind/Petrov-Galerkin scheme is employed and the energy equation is solved using the Taylor-Galerkin method too. the computational domain for ten tubes in the direction of flow is meshed by using the four noded-quadrilateral elements. Equilateral-triangle (ET) tube pattern is considered for staggered tube bank. Reynolds numbers of 100, 200 and 300, Prandtl number of 0.71, and pitch-to-diameter ratios (PDR) of 1.25, 1.5 and 2.0 are chosen for the investigation. Having obtained the flow and the temperature fields, the local skin friction coefficient and the local Nusselt number are calculated for the tubes in the bundle at different times. A comparison of the results of the present study with the results of experiments of other investigators, for the steady-state case, shows good agreement between them.

关键词： Finite element analysis Reynolds number Flow (Dynamics) Simulation Temperature Prandtl number Momentum Steady state Fluid dynamics Finite element methods Skin friction (Fluid dynamics)

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PROCESS SIMULATION AND EXERGY analysis OF A REVERSE OSMOSIS DESALINATION PLANT POWERED BY PHOTOVOLTAIC PANELS IN BASRA (IRAQ)

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10th asme biennial conference on engineering systems design and analysis

作者： Esposto, Stefano Sciubba, Enrico Toro, Claudia Univ Roma La Sapienza Dept Mech Engn I-00184 Rome Italy

ISBN: (纸本)9780791849156

the paper presents the simulation and the exergy analysis of a solar-powered reverse osmosis plant (PV-RO) located in Basra (Iraq) characterized by an average production of 5 m(3) of fresh water per hour. the system layout includes the PV system powering the reverse osmosis unit. Since the purpose of the plant is to supply freshwater to a rural village, the installation of a battery pack as an energy storage is not foreseen. the influence of some relevant process parameters like ambient temperature, global radiation and salinity of the raw water are studied by means of numerical process simulations of the plant. A suitable thermodynamic model of the PV-RO has been developed and implemented into the library of a modular object-oriented Process Simulator, CAMEL-Pro (TM) and the code has been then used to study the exergetic performance of the plant, to help identify and quantify irreversibilitics and losses in energy quality. In CAMEL, the exergy flow associated with each energy and material stream in the plant is calculated on the basis of mass- and energy balances and of a proper set of libraries of material properties, so that the values of the exergy destruction, ExD and of the exergy efficiency, ExEff, of each component can be evaluated.

关键词： Photovoltaic power systems Batteries Radiation (Physics) Flow (Dynamics) Simulation Temperature Exergy Process simulation Reverse osmosis Solar power Energy storage Water Exergy analysis Materials properties

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