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fluid flow models

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Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005579
EISBN: 978-1-62708-174-0
... Abstract Fluid flow is important because it affects weld shape and is related to the formation of a variety of weld defects in gas tungsten arc (GTA) welds. This article describes the surface-tension-driven fluid flow model and its experimental observations. The effects of mass transport on arc...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005636
EISBN: 978-1-62708-174-0
... welding. The article presents the mathematical equations of mass, momentum, energy, and species conservation. It reviews the applications of heat transfer and fluid flow models for different welding processes. Finally, the article discusses the approaches to improve reliability of, and reduce uncertainty...
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Published: 30 September 2014
Fig. 28 Resultant flow fields of computational fluid dynamics model of Case History 1 More
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001334
EISBN: 978-1-62708-173-3
... or Lorentz forces, buoyancy forces, and aerodynamic drag forces caused by passage of the arc plasma over the weld pool surface. Surface-Tension-Driven Fluid Flow Model Surface tension gradients were first proposed by Ishizake et al. ( Ref 2 ) as potential driving forces for weld pool fluid flow...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001482
EISBN: 978-1-62708-173-3
... primarily responsible for mixing and, as a result, also affects the composition of the weld pool. Recently, the sophistication of fluid-flow modeling has reached a stage where most of the important physics are considered. Buoyancy, surface tension, and electromagnetic forces are the three driving forces...
Series: ASM Handbook
Volume: 4F
Publisher: ASM International
Published: 01 February 2024
DOI: 10.31399/asm.hb.v4F.a0007008
EISBN: 978-1-62708-450-5
... facilities, quench system manufacturers, and quench fluid suppliers. It describes the governing differential equations for the fluid flow and heat-transfer phenomena during quenching. The article also discusses different modeling categories to determine a CFD methodology for quenching. computational...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005898
EISBN: 978-1-62708-167-2
... stress between layers, which opposes an applied force. The simplest model to illustrate fluid viscosity is laminar shear of fluid between two plates, known as Couette flow ( Fig. 13 ). Fluid shear occurs due to friction between the fluid and moving boundaries. Fluid iscosity is measured by the force F...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005233
EISBN: 978-1-62708-187-0
... systems geometry arbitrary Lagrangian-Euler equation SIMULATION OF CASTING is motivated by the need to minimize casting defects by understanding and controlling the fluid flow and thermal processes throughout the casting process. However, modeling of casting processes is difficult because...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005426
EISBN: 978-1-62708-196-2
... detail in Ref 26 , which also describes the use of wall functions to calculate wall heat and momentum losses in conjunction with the K -ε model. Descriptions of many two-equation turbulence models, and their relative advantages, can be found in Ref 27 . Numerical Solution of the Fluid-Flow Equations...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003402
EISBN: 978-1-62708-195-5
... to using a Carreau fluid. In the same way, the fiber-fiber interaction may have been represented with a constant parameter in the flow-induced fiber orientation model. However, the model experiments may show that the expected orientation behavior is slightly different than the predictions. This may induce...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005587
EISBN: 978-1-62708-174-0
..., microstructure evaluation, thermal stress analysis, and fluid flow in the weld pool. energy transfer fluid flow heat transfer microstructure evaluation modeling welds thermal stress analysis THE DESIGN OF A STRUCTURE that achieves its highest performance levels with the least chance of failure...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002444
EISBN: 978-1-62708-194-8
... the case for other averaged fluid equations, and this resemblance allows the same numerical techniques for CFD to be applied to both laminar and turbulent flows. In two-equation turbulence models, transport equations are solved for the turbulent kinetic energy K and one other scalar that gives...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005766
EISBN: 978-1-62708-165-8
... insight into the fluid mechanics of the quenching process. For example, streak photography was conducted on a model of a quench tank for an integral quench furnace. Computational fluid dynamics (CFD) modeling is increasingly used to examine the uniformity of fluid flow in a quench tank. Totten...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005525
EISBN: 978-1-62708-197-9
... of the other terms, which, respectively, model the advection and conduction of thermal energy. (Advection is defined here as transport due to fluid flow alone, while convection is the combination of advection and diffusion.) The form of the thermal energy transport equation ( Eq 6 ) is not suitable...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005520
EISBN: 978-1-62708-197-9
... ( Ref 13 ) initiated the third class of models, thermal/fluid flow simulations, by using Darcy's law ( Ref 16 ) rather than analytic solutions for the flow-down cylinders, such as the Hagen Poiseuille equation. Kubo and Pehlke ( Ref 13 ) wrote a computer program to solve a simplified set of transport...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005234
EISBN: 978-1-62708-187-0
... Abstract This article examines the critical features of four key areas of modeling transport phenomena associated with casting processes. These include heat and species transport in a metal alloy, flow of the liquid metal, tracking of the free metal-gas surface, and inducement of metal flow via...
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