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Modelling of keyhole dynamics and porosity formation considering the adaptive keyhole shape ... An investigation on the effects of side assisting gas flow and metallic vapour jet on the stability of keyhole and molten pool during laser full-penetration welding ... element distribution and weld porosity in powder feeding-based laser welding of ...

Others attempt to numerically model the formation of microporosity based on first principles [15-19]. The math-ematical models give insight into the physical mecha-nisms that control the formation and growth of porosity. However, the scale used in the models is typically too big to capture the micro scale defects, i.e. microshrinkage.

A three-dimensional numerical model is used to simulate heat transfer and fluid flow phenomena in fiber laser + gas metal arc welding (GMAW) hybrid welding of an aluminum alloy, which incorporates three-phase coupling and is able to depict the keyhole dynamic behavior and formation process of the keyhole-induced porosity. The temperature profiles and fluid flow fields for different arc powers ...

May 31, 2019· The porosity fraction is related to the particle packing density and the amount of the feeding flow during solidification. The gas porosity model is based on the diffusion kinetics of gas pore formation. A numerical simulation of spray deposition for a billet was carried out by coupling the porosity model with the shape and heat-transfer models. The volume fraction and …

Simulation of feeding flow and prediction of macro porosity of SGI casting based on microstructure formation H. D. Zhao*1 and B. C. Liu2 Based on the model of microstructure formation of ...

A volume-averaged model for finite-rate diffusion of hydrogen in the melt is developed to predict pore formation during the solidification of aluminum alloys. The calculation of the micro-/macro-scale gas species transport in the melt is coupled with a model for the feeding flow and pressure field. The rate of pore growth is shown to be proportional to the local level of gas supersaturation in ...

For steel, a multi-phase model is developed that predicts melt pressure, feeding flow, porosity (both microscopic and macroscopic), and riser pipe formation during casting. The phases included in the model are solid, liquid, porosity, and air. An energy equation is solved to determine solid fraction.

A Finite Volume model, coupled with FE heat/flow calculations, has been developed to predict microporosity, macroporosity and pipe shrinkage formation during the solidification of alloys for arbitrary 2D (cartesian and axisymmetric) and 3D geometries. The microporosity model built upon a Darcy flow approach, includes al1 the basic physical

Dual-porosity models consider the matrix as composed of disconnected blocks that provide storage volumes but only exchange fluids with the fractures and not with adjacent matrix blocks. As such, there is no flow within the matrix at the continuum scale. In dual-permeability models, flow can occur within the matrix continuum, so the

Apr 01, 2003· Concerning the modeling of porosity formation, Piwonka and Flemings employed the pressure drop formula for a laminar flow in the pipe to predict the pore size. Davies , and Moosbrugger and Berry used a similar mathematical model to calculate feeding ranges. In their modeling, the solidus temperature was calculated instead of the actual flow velocity.

The formation resistivity factor measure the influence of pore structure on the resistance of sample. In the absence of a conductive mineral layer the electrical current can flow only through the fluid in the rock interconnected pores. This implies that F is related to the porosity of the rock.

Porosity may be classified according to the mode of origin as “original” and “induced”. The original porosity is that developed in the process of deposition that forms the rock, while induced or secondary porosity added at a later stage by some geologic and chemical process.The inter-granular porosity of sandstones and the inter-crystalline and oolitic porosity of some limestones ...

MODELING OF POROSITY FORMATION AND FEEDING FLOW IN STEEL CASTING Kent D. Carlson, Zhiping Lin, Richard A. Hardin and Christoph Beckermann Department of Mechanical and Industrial Engineering The University of Iowa Iowa City, Iowa 52242 Abstract A multi-phase model is presented that predicts melt pressure, feeding flow, and porosity

FLOW-3D CAST‘s cast iron model describes the solidification of hypo- and hyper-eutectic iron-carbon-silicon alloys.It predicts the formation of graphite, austenite (or gamma-iron) and carbide phases during the eutectic reaction. Volume changes during cooling and solidification are coupled with shrinkage and porosity formation models.

addition of the arc in the hybrid laserarc welds inhibited the formation of porosity at laser powers in excess of 4 kW. A welltested threedimensional heat transfer and fluid flow model was used to determine both the geometry of the fusion zone and the region of mixing of the filler metal within the weld pool for various welding vari ables.

The Gurley No. 4190 S-P-S Tester measures a given air flow through the sample for porosity tests and leakage across its surface(s) for softness or smoothness tests. This is accomplished by changing a variety of adapter and clamping plates. This model is identical to the No. 4110 and 4140 for porosity tests and their components.

The model predicts the amount and size of the porosity in a solidified casting. Computation of the micro-/macro-scale gas species transport in the melt is coupled with the simulation of the feeding...

With the increasing complexity of castings, shrinkage porosity due to poor feeding is often inevitable in large part sections, despite optimized gating and feeding systems and proper die temperature management. In high pressure and permanent mold castings, squeeze pins are frequently used to locally press the metal to reduce shrinkage porosity.

A mathematical dual porosity and dual permeability numerical model based on perpendicular bisection (PEBI) grid is developed to describe gas flow behaviors in shale-gas reservoirs by incorporating slippage corrected permeability and adsorbed gas effect. Parametric studies are conducted for a horizontal well with multiple infinite conductivity hydraulic fractures in shale-gas reservoir to ...

induced macro-porosity. Those models are the hydrodynamic model with its full fluid flow capabilities and the simplified shrinkage model in which bulk fluid flow is only estimated. The simplified model requires much less computational effort and it is the best model choice when conditions are compatible with its underlying assumptions.

expectation of porosity is required in light of the fact that if porosity is distinguished as gas porosity and the pouring temperature is brought down to diminish the same, it might prompt different imperfections like cold shut. IndexTerms - Sand casting, casting defects, defect analysis, Shrinkage porosity, aluminium alloy, casting simulation.

The typical sequence for groundwater dispersion modeling is to perform Darcy Flow, then Particle Track, then Porous Puff. Examples. An example of the command dialog for Darcy Flow follows: Input groundwater head elevation raster = "head" Input effective formation porosity raster = "poros" Input saturated thickness raster = "thickn"

segregation formation inside a 25 m long horizontal continuous casting strand was examined for a binary Fe-C-alloy based on an Eulerian-Eulerian multiphase model. Neglecting gravity, the influence of feeding and bulging mechanisms on the formation of macrosegregation inside the strand was investigated. Furthermore, the change of

Porosity formation cause costly scrap loss and limits the use of cast parts in critical ... be used for designing and modifying the feeding systems [4]. Flow simulation can give the idea about velocity of molten metal during mold filling, filling time and ... model were generated in Pro-E modeling …

Nov 15, 2011· The molten pool and keyhole phenomena of laser beam welding were simulated using the developed model, as well as the formation of keyhole-induced porosities. It was found that the keyhole depth self-fluctuates in continuous laser welding, and the bubbles formed from keyhole collapse and shrinkage are the cause of keyhole-induced porosity.

finite-volume approach is developed for the flow calculations. To validate the model, predicted results are compared with the experimental data. The comparison results show that the advanced feeding model can accurately predict the occurrence of shrinkage porosity defects in metal castings.

low porosity throughout with values ranging between 0.445 and 0.826 percent. A high pressure die casting of a V-6 engine block shows regions where micro-porosity forms. Flow Science, Inc. — www.flow3d.com — [email protected] — (505) 982-0088 Excellence in Flow Modeling Software

Oct 19, 2020· The geological formation and physical parameters data from well logs interpretations are crucial for the construction of fluid-flow model of the reservoir as well as estimating the original oil-in-place (OOIP) R ك Log sample 3 ROSSM on sa RHOD 6.0 דוכאה orס 20 10 Depth A DET NO SV100 WE Phil * CEP Antyante 7430 7880 PESO 7430 IS00 ...

Apr 12, 2016· Accumulation and migration of reservoir fluids on rock formation that crack naturally has first porosity type from porosity systems which look like as ussual sandstone formation. As a result of it, the technique that has been developed for define physical feature of porous sandstone, can be also used for a intercrystalline- intergranular ...

Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and . Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam).. There are many ways to test porosity in a ...

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