Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Thermocapillary Convection During Laser Surface Heating
Download Thermocapillary Convection During Laser Surface Heating full books in PDF, epub, and Kindle. Read online Thermocapillary Convection During Laser Surface Heating ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Thermocapillary Convection During Laser Surface Heating by : Cho Lik Chan
Download or read book Thermocapillary Convection During Laser Surface Heating written by Cho Lik Chan and published by . This book was released on 1986 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Surface Processing and Model Studies by : Bekir Sami Yilbas
Download or read book Laser Surface Processing and Model Studies written by Bekir Sami Yilbas and published by Springer Science & Business Media. This book was released on 2013-03-15 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces model studies associated with laser surface processing such as conduction limited heating, surface re-melting, Marangoni flow and its effects on the temperature field, re-melting of multi-layered surfaces, laser shock processing, and practical applications. The book provides insight into the physical processes involved with laser surface heating and phase change in laser irradiated region. It is written for engineers and researchers working on laser surface engineering.
Book Synopsis Thermocapillary Convection in the Weld Pool for Single and Dual Beam Laser Welding Systems by : Tien-Ching Chen
Download or read book Thermocapillary Convection in the Weld Pool for Single and Dual Beam Laser Welding Systems written by Tien-Ching Chen and published by . This book was released on 1996 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermocapillary Convection in a Model of the Molten Zone During Laser Penetration Welding by : Michael William MacArthur
Download or read book Thermocapillary Convection in a Model of the Molten Zone During Laser Penetration Welding written by Michael William MacArthur and published by . This book was released on 1992 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Melting and Surface Deformation of Materials During Pulsed Laser Heating by : Shaochen Chen
Download or read book Melting and Surface Deformation of Materials During Pulsed Laser Heating written by Shaochen Chen and published by . This book was released on 1999 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Oscillatory Thermocapillary Convection in Circular Containers with CO2 Laser Heating by : Jung Hyun Lee
Download or read book A Study of Oscillatory Thermocapillary Convection in Circular Containers with CO2 Laser Heating written by Jung Hyun Lee and published by . This book was released on 1994 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermocapillary Convection in Laser Melted Pools During Materials Processing by : Randall Lane Zehr
Download or read book Thermocapillary Convection in Laser Melted Pools During Materials Processing written by Randall Lane Zehr and published by . This book was released on 1991 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical study was undertaken in order to understand the complex heat transfer encountered during laser welding of metals. Melting and resolidification of the material occurs when the metal undergoes intense, non-uniform irradiation from a concentrated energy source, such a laser. Motion of the liquid metal in the molten region is induced by buoyancy and surface tension (thermocapillary) forces. This motion of the liquid metal causes heat to be redistributed (convective heat transfer) which in turn effects the melt pool shape (solid/liquid interace), local temperature gradients, and ultimately, the microstructure of the resolidified material. In order to better understand the importance of thermocapillary convection within the melted region during the laser welding process, both two-dimensional and three-dimensional steady-state finite difference models were developed. The governing mass, momentum, and energy transport equations were discretized using a control volume formulation which incorporated variables mesh and variable thermophysical property capabilities. Results from both the two-dimensional and three-dimensional models indicate that convection of the molten metal within the melt region during laser welding plays an important role in the overall heat transfer of the process. Surface tension (thermocapillary) forces are shown to be the predominant driving mechanism of the flow in the molten metal region. Both two-dimensional and three-dimensional models show the development of recirculating flow patterns in the melt pool due to thermocapillary convection. Three-dimensional results indicate that at higher substrate scanning speeds complex recirculating flow patterns occur which can not be predicted using two-dimensional models. Maximum free surface velocities on the order of 1 m/s occur in the melt region due to the severe thermal gradients induced by the concentrated energy source. The melt pool aspect ratios (width/depth) are shown to increase (compared to conduction models) for low Prandtl materials (Steel $sim$0.1, Aluminium $sim$0.01) due to the redistribution of heat by thermocapillary induced convection. Surface active agents (elements which modify the local values of surface tension) are shown to dramatically influence the convective flow patterns (and therefore convective heat transfer) in the molten region. Three-dimensional dynamic free surface boundary conditions were derived from first principles for the welding simulations. The welding codes were then modified to allow dynamic movement of the molten free surface during the simulations. Initial free surface calculations reveal surface deflections which are small compared to the characteristic length of the melt pool. Thermocapillary driven square cavity calculations were initiated in order to examine the concentrated temperature gradient region developed in (generic) thermocapillary flows. High Ma flows were found to exhibit a singular behavior which decreased with decreasing Pr. Surface contaminants were found to inhibit the development of this singular region.
Book Synopsis Laser Pulse Heating of Surfaces and Thermal Stress Analysis by : Bekir S. Yilbas
Download or read book Laser Pulse Heating of Surfaces and Thermal Stress Analysis written by Bekir S. Yilbas and published by Springer Science & Business Media. This book was released on 2013-07-10 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces laser pulse heating and thermal stress analysis in materials surface. Analytical temperature treatments and stress developed in the surface region are also explored. The book will help the reader analyze the laser induced stress in the irradiated region and presents solutions for the stress field. Detailed thermal stress analysis in different laser pulse heating situations and different boundary conditions are also presented. Written for surface engineers.
Book Synopsis Laser Processing: Surface Treatment and Film Deposition by : J. Mazumder
Download or read book Laser Processing: Surface Treatment and Film Deposition written by J. Mazumder and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 937 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthesis of nonequilibrium metallic phases has been an area of great interest to the materials processing community since early 1960. Inherent rapid cooling rates in laser processing are being used to engineer non-equilibrium microstructures which cannot be rivaled by other processes. This lecture will discuss the phenomena involved and its application in designing materials with tailored properties. What is non-equilibrium Synthesis? This is a synthesis method to produce binary or higher order materials where kinetics of the pro cess affects the transport of the constituent elements during phase transformation resulting in a composition or crystallographic configuration which is different from what is observed when the elements arranges themselves with the lowest possible Gibbs Free energy, which is the equilibrium condition. Figure 1 illustrates the phenomena. Phase diagram under equilibrium condition is illustrated by the solid line whereas the no-equilibrium phase diagram is represented by the dotted line. One can observe the shrinkage of the phase field under non-equilibrium condition. Any alloy composition between the solidus lines of the equilibrium and non-equilibrium phase diagram will be a non equilibrium alloys with extended solid solution.
Book Synopsis Thermocapillary Convection in a Floating Zone with a Deformable Free Surface by : John Robert Hyer
Download or read book Thermocapillary Convection in a Floating Zone with a Deformable Free Surface written by John Robert Hyer and published by . This book was released on 1990 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Heating Applications by : Bekir Yilbas
Download or read book Laser Heating Applications written by Bekir Yilbas and published by Elsevier. This book was released on 2012-06-22 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book describes those areas of thermodynamics which prove conductive to equilibrium and non-equilibrium heating theories in addition to yielding results that serve as data for further theories"--
Book Synopsis Conduction and Convection of Heat Produced by the Attenuation of Laser Beams in Liquids by :
Download or read book Conduction and Convection of Heat Produced by the Attenuation of Laser Beams in Liquids written by and published by . This book was released on 2007 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical models are used to simulate temperature changes that are induced by the absorption of energy from propagating laser beams in water. Both convective and conductive heat transfer are considered. Thermally insulated surfaces as well as surfaces involving heat transfer with the surroundings are considered. The simulated results demonstrate the importance of thermal convection. In the first part of this report containers with closed surfaces are considered. In the second part of the report free-surface effects are considered: These effects include evaporative heat loss and the occurrence of surface tension produced by temperature gradients at the surface (the Marangoni effect). Evaporative heat loss is simulated and the Marangoni effect is discussed. The quantitative determination of the temperature changes in the water due to the heat transferred by an absorbed laser beam could facilitate the improvement of models involving the optics of laser beam penetration in liquids.
Book Synopsis Laser Applications for Mechanical Industry by : S. Martellucci
Download or read book Laser Applications for Mechanical Industry written by S. Martellucci and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern manufacturing industry is focusing its interests on the potential offered by the laser, in combination with other new technologies such as optical fibres, automation, computing and flexible manufacturing systems, to give new and powerful methods for non-destructive testing, in-process quality assurance, laser material processing and process control, and laser robotics. The greatest opportunities for the laser are in those areas where flexibility, automation, CAD/CAM integration, precision, cost reduction, and time to market are important factors. The examples covered here are mainly drawn from the automotive industry, where all these factors are imperative, and where the CO2, Nd-YAG and excimer laser sources are already making their contribution to the manufacturing process.
Book Synopsis Surface Heat Propagation in Layered Materials After Pulsed Laser Heating by : Gorm Gamborg Andersen
Download or read book Surface Heat Propagation in Layered Materials After Pulsed Laser Heating written by Gorm Gamborg Andersen and published by . This book was released on 2006 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Modeling of Thermocapillary Convection with Curved and Deforming Free Surfaces by : Gyanendra P. Sasmal
Download or read book Numerical Modeling of Thermocapillary Convection with Curved and Deforming Free Surfaces written by Gyanendra P. Sasmal and published by . This book was released on 1993 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Basic Understanding of Rapid Mold Surface Heating Via Laser Energy by : Charles Daniel Fox
Download or read book A Basic Understanding of Rapid Mold Surface Heating Via Laser Energy written by Charles Daniel Fox and published by . This book was released on 2012 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the research and development of surface heating methods have increased in the recent years, the consensus has been reached amongst the injection molding community that an elevated mold surface temperature near or greater than the polymer solidification temperature provides acceptable replication of the desired micro-structured parts. The laser heating experimental work and simulation development carried out includes two sample sizes similar to those used in injection molding. A 100W CO2 laser incident on three samples of different surface roughnesses has shown to have elevated temperatures via thermal cameral data and thermocouple measurements. Among five different laser spot sizes varying from 1 mm to 20 mm in diameter, heating rates from 1 second to 5 minutes have shown temperatures rises from 230C to often over 1000C, when measuring 1 mm below the heated surface. A particular case with a laser spot size of 3 mm in diameter incident on a 30 mm thick sample has absorbed 13.2W of laser energy and yielded a surface temperature over 1800C through simulation. A new design has been proposed to allow for a more practical heating method that is feasible, economical, and deemed the next step in future work for laser heating in the rapid mold surface heating community.
Book Synopsis Physics of Laser Materials Processing by : Gennady G. Gladush
Download or read book Physics of Laser Materials Processing written by Gennady G. Gladush and published by Springer Science & Business Media. This book was released on 2011-08-05 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the basic mechanisms, theory, simulations and technological aspects of Laser processing techniques. It covers the principles of laser quenching, welding, cutting, alloying, selective sintering, ablation, etc. The main attention is paid to the quantitative description. The diversity and complexity of technological and physical processes is discussed using a unitary approach. The book aims on understanding the cause-and-effect relations in physical processes in Laser technologies. It will help researchers and engineers to improve the existing and develop new Laser machining techniques. The book addresses readers with a certain background in general physics and mathematical analysis: graduate students, researchers and engineers practicing laser applications.