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Journal articles on the topic 'Variable mushy zone parameter'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Tajik Jamalabad, Milad, Cristobal Cortes, Javier Pallarés, Antonia Gil, and Inmaculada Arauzo. "Comparison of Different Numerical Models for Solidification of Paraffin-Based PCMs and Evaluation of the Effect of Variable Mushy Zone Constant." Energies 17, no. 23 (2024): 5982. http://dx.doi.org/10.3390/en17235982.

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The impact of the mushy zone parameter (Amushy) and the chosen numerical model during the solidification of a commercial paraffin-type phase change material (PCM) in a vertical cylinder under T-history conditions was examined through numerical simulations. The cooling process was modeled using three methods implemented in the CFD software ANSYS Fluent 2020 R2: the enthalpy–porosity method, the apparent heat capacity (AHC) method, and a new model proposed by the authors which incorporates heat capacity directly into ANSYS Fluent. To accurately define the boundary conditions, radiative heat tran

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2

Dikmetaş, Celal Mert, Sare Mıtıncık, Ahmet Aktürk, and Mustafa Yusuf Yazıcı. "Numerical Modelling of Graphite-Based Composite Thermal Energy Storage Unit: Effect of Numerical Variable." Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi 15, no. 2 (2025): 658–74. https://doi.org/10.21597/jist.1583596.

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Thermal energy storage (TES) systems have a great potential on the providing balance of energy demand/supply, while also contributing to net-zero emissions, a reduced carbon footprint, and a greener environment. Paraffin phase change materials have emerged as a prominent material for TES applications due to its potentially high energy storage density. However, their application is significantly limited by its low thermal conductivity values. This study introduces a composite structure for thermal energy storage, utilizing paraffin as the latent heat storage material and a graphite matrix to en

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3

Zaytoon, M. S. Abu, and M. H. Hamdan. "Fluid Mechanics at the Interface between a Variable Viscosity Fluid Layer and a Variable Permeability Porous Medium." WSEAS TRANSACTIONS ON HEAT AND MASS TRANSFER 16 (September 28, 2021): 159–69. http://dx.doi.org/10.37394/232012.2021.16.19.

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Coupled parallel flow of fluid with pressure-dependent viscosity through an inclined channel underlain by a porous layer of variable permeability and variable thickness is initiated in this work. Conditions at the interface between the channel and the porous layer reflect continuity assumptions of velocity, shear stress, pressure and viscosity. Viscosity is assumed to vary in terms of a continuous pressure function that is valid throughout the channel and the porous layer. Model equations are cast in a form where the pressure as an independent variable and solutions are obtained to illustrate

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4

Evangelakis, G. A., I. E. Lagaris, D. G. Papageorgiou, and C. Prouskas. "An enthalpy method for heat conduction in tube containing phase change material." Thermal Science and Engineering 8, no. 1 (2025): 9781. https://doi.org/10.24294/tse9781.

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We present an innovative enthalpy method for determining the thermal properties of phase change materials (PCM). The enthalpy-temperature relation in the “mushy” zone is modelled by means of a fifth order Obreshkov polynomial with continuous first and second order derivatives at the zone boundaries. The partial differential equation (PDE) for the conduction of heat is rewritten so that the enthalpy variable is not explicitly present, rendering the equation nonlinear. The thermal conductivity of the PCM is assumed to be temperature dependent and is modelled by a fifth order Obreshkov polynomial

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5

Shash, Ahmed, Amer E. Amer, Iman S. El-Mahallawi, and Moataz A. El-Saeed. "The Effect of Process Parameters on the Mechanical Properties of A356 Al-Alloy/ZrO₂ Nanocomposite." Journal of Nano Research 38 (January 2016): 1–8. http://dx.doi.org/10.4028/www.scientific.net/jnanor.38.1.

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In this study the effect of zirconia (ZrO2) nanoparticles (40 nm) in reinforcing A356 aluminum alloys as a base metal matrix were investigated. Zirconia nanopowders were stirred in the A356 matrix with different fraction ratios ranging from (0, 1, 2, 3, 5%) by weight at variable stirring speeds ranging from (270, 800, 1500, 2150 r.p.m) at a mushy zone (600°C) and liquid state (700°C) using a constant stirring time for one minute. The microstructure revealed the change of grains from dendritic to spherical shape with increasing stirring speed. The Scanning Electron Microscopy of the fractured s

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6

Li, Xiang Ming, and Zi Dong Wang. "Analytical Solution of Mushy Zone under Directional Solidification." Advanced Materials Research 662 (February 2013): 262–65. http://dx.doi.org/10.4028/www.scientific.net/amr.662.262.

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Based on the general mathematical formulation under unidirectional solidification with mushy layer developed in Ref.[13], leading approximation of solution in mushy layer is obtained for the case that the inverse Lewis number is small parameter. For the steady state of solidification, concentration field in the mushy region is given as function of a solid volume fraction. Mushy layer width and solid volume fraction at the solid-mush interface are obtained. Effects of temperature gradient on mushy layer width and solid volume fraction at solid-mush interface are presented.

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7

Buyevich, Yu A., L. Y. Iskakova, and V. V. Mansurov. "The nonlinear dynamics of solidification of a binary melt with a quasi-equilibrium mushy region." Canadian Journal of Physics 68, no. 9 (1990): 790–93. http://dx.doi.org/10.1139/p90-115.

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A mushy region (a two-phase zone) between the solid and liquid phases occurs often in the process of solidification of a binary melt. An analysis of the structure of the mushy region, which includes the liquid, solid particles, and dendrites extending from the bulk solid surface, is suggested. The processes of heat and mass transfer in the mushy region are considered on the basis of the small parameter method. The analysis leads to equations governing unsteady heat and mass transfer with internal heat, and mass sources within the mushy region, and it includes the condition for the absence of s

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8

Tangthieng, C., F. B. Cheung, and S. W. Shiah. "Behavior of the Two-Phase Mushy Zone During Freeze Coating on a Continuous Moving Plate." Journal of Heat Transfer 124, no. 1 (2001): 111–19. http://dx.doi.org/10.1115/1.1420714.

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The process of freeze coating of a binary substance on a chilled moving plate is studied theoretically with special emphasis on the behavior of the two-phase mushy zone. The flow and heat transfer in five separate regions of the system, i.e., the moving plate, the freeze coat, the two-phase packing region, the two-phase dispersed region and the molten substance region, are formulated mathematically to describe the freeze-coating process. A supplemental equation derived from a simplified phase diagram and an appropriate viscosity model are employed to complete the mathematical description of th

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9

Sanyal, Dipayan, P. Ramachandra Rao, and O. P. Gupta. "Modelling of free boundary problems for phase change with diffuse interfaces." Mathematical Problems in Engineering 2005, no. 3 (2005): 309–24. http://dx.doi.org/10.1155/mpe.2005.309.

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We present a continuum thermodynamical framework for simulating multiphase Stefan problem. For alloy solidification, which is marked by a diffuse interface called the mushy zone, we present a phase filed like formalism which comprises a set of macroscopic conservation equations with an order parameter which can account for the solid, liquid, and the mushy zones with the help of a phase function defined on the basis of the liquid fraction, the Gibbs relation, and the phase diagram with local approximations. Using the above formalism for alloy solidification, the width of the diffuse interface (

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10

Obiso, D., K. Yasuda, A. D. Voigt, M. Schreiner, M. Massoudi Farid, and A. Richter. "CFD Modeling of the Melting Behavior of a Fayalitic Slag." JOM 74, no. 4 (2022): 1533–42. http://dx.doi.org/10.1007/s11837-022-05185-4.

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AbstractThe melting behavior of a fayalitic slag was investigated with computational fluid dynamics and validated with experimental data. A heating microscope was employed to perform a typical ash melting behavior (AMB) test, in order to gain information about the melting behavior of the slag. The numerical approach is based on using the volume of fluid (VOF) method, in order to track the interface between the slag and the gas phases, and on the enthalpy–porosity model, in order to simulate the slag as a phase change material (PCM). The combined VOF-PCM model was therefore applied to perform a

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11

Jen, Tien-Chien, Yuning Jiao, and Thomas Hwang. "A Parametric Study of Solute Redistribution During Transient Liquid Phase Diffusion Bonding Process." International Journal of Rotating Machinery 7, no. 6 (2001): 387–96. http://dx.doi.org/10.1155/s1023621x01000331.

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A parametric study is performed to investigate the solute redistribution during the transient liquid phase (TLP) diffusion bonding process. The macroscopic solute diffusion in the liquid and the solid phase, as well as the solid transformation to the liquid due to solute macrosegregation, are considered in this study. The effects of the following parameters are considered: ratio of solute diffusivity in liquid and solid state alloy(ξ=Dl/Ds), holding temperatures(θ), a combined parameter related to solidus and liquidus slopes in the phase diagram(ϕ), and the re-melting and re-solidification tim

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12

Karimi-Sibaki, Ebrahim, Abdellah Kharicha, J. Korp, Meng Huai Wu, and Andreas Ludwig. "Influence of Crystal Morphological Parameters on the Solidification of ESR Ingot." Materials Science Forum 790-791 (May 2014): 396–401. http://dx.doi.org/10.4028/www.scientific.net/msf.790-791.396.

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Electroslag remelting (ESR) is an advanced process to produce high quality steel. During the ESR process, the steel electrode is melted and then solidified directionally in a water-cooled mold. The quality of the ingot is strongly dependent on the shape of melt pool, i.e. the depth and thickness of mushy zone, which is in turn influenced by the bulk and interdendritic flow. Here, we perform a numerical study to investigate the effect of crystal morphological parameter such as primary dendrite arm spacing on the solidification of the ESR ingot ( 750 mm). The crystal morphology is dominantly col

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13

Ferreira, Ileao L., D. J. Moutinho, L. G. Gomes, O. L. Rocha, Pedro R. Goulart, and Amauri Garcia. "Microstructural Development in a Ternary Al-Cu-Si Alloy during Transient Solidification." Materials Science Forum 636-637 (January 2010): 643–50. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.643.

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Macrosegregation and microporosity formation numerical models are dependent on microstructural parameters, such as primary and secondary arm spacings to provide the permeability coefficient in the mushy zone. As can be observed in the literature, growth models for ternary alloys for unsteady solidification are rarely found. In this paper, the primary (λ1) dendrite arm spacing was measured along the length of an Al-Cu-Si alloy casting and correlated with transient solidification thermal variables. A combined theoretical and experimental approach has been carried out to quantitatively determine

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14

Viardin, Alexandre, Laszlo Sturz, M. Apel та Ulrike Hecht. "Phase Field Modeling of β(Ti) Solidification in Ti-45at.%Al: Columnar Dendrite Growth at Various Gravity Levels". Materials Science Forum 790-791 (травень 2014): 34–39. http://dx.doi.org/10.4028/www.scientific.net/msf.790-791.34.

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At present, our understanding of the interaction between melt flow and solidification patterns is still incomplete. In columnar dendritic growth buoyancy driven flow may alter the dendrite tip and spacing selection and consequently the microsegregation of alloying elements. With the aim of supporting directional solidification experiments under hyper-gravity using a large diameter centrifuge (LDC), phase field simulations of β (Ti) dendrite growth have been performed under various gravity conditions for the binary alloy Ti-45at.%Al. The results show that Al segregation at the growth front caus

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15

Dwivedi, Shashi Prakash, Satpal Sharma, and Raghvendra Kumar Mishra. "Electromagnetic Stir Casting and its Process Parameters for the Fabrication and Refined the Grain Structure of Metal Matrix Composites – A Review." International Journal of Advance Research and Innovation 2, no. 3 (2014): 125–38. http://dx.doi.org/10.51976/ijari.231421.

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In numerous applications of casting, dendritic microstructure is not desirable as it results in poor mechanical properties. Enhancing the fluid flow in the mushy zone by mechanical stirring is one of the means to suppress this dendritic. Several manufacturing techniques have been invented for fabrication of metal matrix composites. One of the popular ways of generating non-dendritic microstructure is to stir the liquid metal during solidification using an electromagnetic force field. However, the main problem faced in the electro magnetic stir (EMS) casting is the selection of optimum combinat

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16

Svantesson, Jonas L., Mikael Ersson, Matej Imris, and Pär G. Jönsson. "Numerical Analysis of Slag Transfer in the IronArc Process." Metallurgical and Materials Transactions B 51, no. 5 (2020): 2171–86. http://dx.doi.org/10.1007/s11663-020-01930-9.

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Abstract The IronArc process is a novel approach to ironmaking which aims to reduce the associated $${\hbox {CO}}_{2}$$ CO 2 emissions. By superheating gas using electricity in a plasma generator (PG) the heat required for the process can be supplied without burning of coke. Reduction of hematite and magnetite ores is facilitated by additions of hydrocarbons from liquid natural gas (LNG). The melting and reduction of ore will produce a molten slag containing 90 pct wüstite, which will be corrosive to most refractory materials. A freeze-lining can prevent refractory wear by separating the molte

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17

Brionne, Gary, Abdelhalim Loucif, Chun Ping Zhang, Louis Philippe Lapierre-Boire, and Mohammad Jahazi. "3D FEM Simulation of the Effect of Cooling Rate on SDAS and Macrosegregation of a High Strength Steel." Materials Science Forum 941 (December 2018): 2360–64. http://dx.doi.org/10.4028/www.scientific.net/msf.941.2360.

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Secondary dendrite arm spacing (SDAS) is a macrosegregation parameter directly linked to content of macrosegregation through cooling rates. The aim of this paper is to highlight the effect of cooling rate on the SDAS and macrosegregation patterns in a high strength steel. For this purpose, directionnal solidification in a cylinder was modeled with a plane-front solidification. Two cylinders were modeled with different boundary conditions (Tsurface = 1000°C and 1200°C). Using the FEM software Thercast, 3D macrosegregation maps were generated with thermomechanic algorithm taking into account met

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18

Nzebuka, Gaius Chukwuka, and Mufutau Adekojo Waheed. "Numerical Modeling of Heat and Specie Transfer in a Diffusion Dominated Continuum Model of Binary-Alloy Castings." Defect and Diffusion Forum 389 (November 2018): 183–94. http://dx.doi.org/10.4028/www.scientific.net/ddf.389.183.

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A numerical modeling of diffusion-controlled heat and specie transfer using a source base method to determine evolution of liquid/solid fraction from energy equation both for constant densities in the phases and variable densities as a function of temperature and concentration was developed to predict macro-solute redistribution in binary alloy system. From the results, it is observed that there was a solute depleted zone near the chill surface and that, the source base method can be effectively implemented without the need for setting a large arbitrary value in determining the derivative of l

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19

Soliman, Ahmed Saad, Ahmed A. Sultan, and Mohamed A. Sultan. "Effect of Mushy Zone Parameter on Phase Change Behavior of Different Configurations Storage Unit: Numerical Simulation and Experimental Validation." Sustainability 14, no. 21 (2022): 14540. http://dx.doi.org/10.3390/su142114540.

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The melting process of paraffin wax placed in storage capsules of different shapes was experimentally and numerically studied. The phase change material (PCM) was initially at 27 °C. The effect of the mushy zone parameter (Amush) value on the melting process of the PCM was studied with storage capsules of different shapes (circular, vertical oval, and horizontal oval). The results of the numerical model were validated with the experimental results to obtain the optimum Amush value for each shape of the latent heat storage unit. The results showed that the value of the Amush has a great impact

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20

Eßl, Werner, Georg Reiss, Raluca Andreea Trasca, Masoud Sistaninia, Peter Raninger, and Sina Lohrasbi. "The Melt–Crystal Interface in the Production of Monocrystalline Sapphire via Heat Exchanger Method—Numerical Simulation Aspects." Crystals 14, no. 12 (2024): 1036. http://dx.doi.org/10.3390/cryst14121036.

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In this work, selected numerical simulation aspects are analyzed in terms of their effect on predictions of the m-c interface. The fixed-grid enthalpy porosity phase change model, which is highly attractive in the field of modeling sapphire crystallization processes, is examined for its sensitivity to the mushy zone parameter as well as the grid resolution. A further focus is set to the simulation of thermal transport including internal radiation in the crystal and the melt via the finite volume method. Depending on the purpose of the investigation, different requirements on the angular resolu

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21

Amberg, Gustav, and G. M. Homsy. "Nonlinear analysis of buoyant convection in binary solidification with application to channel formation." Journal of Fluid Mechanics 252 (July 1993): 79–98. http://dx.doi.org/10.1017/s0022112093003672.

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We consider the problem of nonlinear thermal-solutal convection in the mushy zone accompanying unstable directional solidification of binary systems. Attention is focused on possible nonlinear mechanisms of chimney formation leading to the occurrence of freckles in solid castings, and in particular the coupling between the convection and the resulting porosity of the mush. We make analytical progress by considering the case of small growth Péclet number, δ, small departures from the eutectic point, and infinite Lewis number. Our linear stability results indicate a small O(δ) shift in the criti

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22

Yu, Kezai, Lijun Xu, Yanling Zhang, Haibo Zhang, and Zhonghua Zhan. "Endogenous–Exogenous Analyses of the Solidification Structure in 475 mm Extra-Thick Slabs: Columnar-to-Equiaxed Positioning and Effect of Strand Electromagnetic Stirring." Materials 18, no. 10 (2025): 2179. https://doi.org/10.3390/ma18102179.

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The spatial distribution of equiaxed crystal zones during extra-thick slab solidification exerts a critical influence on the mechanical performance of the final product. This investigation establishes a dual-pathway control framework for solidification structure modulation, differentiating between intrinsic regulation through columnar-to-equiaxed transition (CET) positioning and extrinsic intervention via strand electromagnetic stirring (S-EMS) parameter adjustment. The aim is to improve the internal quality of extra-thick slabs, enabling further investigations into the material properties. To

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23

Memon, Azim, and Anoop K. Gupta. "Effects of aspect ratio and mushy-zone parameter on melting performance of a thermal energy storage unit filled with phase change material." International Journal of Chemical Reactor Engineering 19, no. 8 (2021): 817–27. http://dx.doi.org/10.1515/ijcre-2020-0182.

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Abstract An intermittent supply of energy from renewable or unconventional resources has resulted in the use of phase change materials (PCM) in thermal energy storage (TES) systems. In this work, melting and heat transfer characteristics in a rectangular enclosure of different aspect ratios (width to height) filled with a phase change material (PCM) have been studied numerically. The n-octadecane has been selected as the PCM (melting temp = 301.35 K, Prandtl number ∼ 60). We considered five different aspect ratios (AR) of the enclosure to delineate the effects of 9-fold variation in the aspect

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24

Wen, Jin, and Theodore F. Smith. "Development and Validation of Online Parameter Estimation for HVAC Systems." Journal of Solar Energy Engineering 125, no. 3 (2003): 324–30. http://dx.doi.org/10.1115/1.1591802.

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Improving the energy efficiency of buildings by examining their heating, ventilating, and air-conditioning (HVAC) systems represents an opportunity. To improve energy efficiency, to increase occupant comfort, and to provide better system operation and control algorithms for these systems, online estimation of system parameters, including system thermophysical parameters and thermal loads, is desirable. Several reported studies have presented simulation results and assumed that the thermal loads are known. A difficulty in HVAC system parameter estimation is that most HVAC systems are nonlinear,

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25

Zheng, Hong Liang, Yu Cheng Sun, Ning Zhang, Kai Zhang, and Xue Lei Tian. "Shrinkage Porosity Simulation of Spheroidal Graphite Iron Castings Based on Macro-Micro Models." Materials Science Forum 689 (June 2011): 190–97. http://dx.doi.org/10.4028/www.scientific.net/msf.689.190.

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Shrinkage porosity is often found in Spheroidal graphite iron (S. G. Iron) castings because of the mushy zone and special volume change during their solidification. Although the volume expansion is very important to the shrinkage porosity simulation of S.G. Iron castings, conventional methods for predicting the porosity defects do not consider it. A Series of macro-micro models such as macro heat transfer calculation and microstructure formation simulation are proposed to simulate the solidification of S. G. Iron castings. The nucleation and growth models are employed to calculate the accurate

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Krane, M. J. M., and F. P. Incropera. "Experimental Validation of Continuum Mixture Model for Binary Alloy Solidification." Journal of Heat Transfer 119, no. 4 (1997): 783–91. http://dx.doi.org/10.1115/1.2824183.

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Experiments were performed with binary metal alloys to validate a continuum mixture model for alloy solidification. Ingots of two compositions, Pb-20%Sn and Pb-40%Sn, were cast in a permanent mold, and the solidification process was simulated. Temperature histories were measured during casting, and composition profiles were found in the solidified ingot. Dendritic arm spacings were found from optical micrographs of the alloy microstructure and used to determine a constant in the Blake-Kozeny submodel for the mushy zone permeability in the liquid-solid interaction term of the momentum equations

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Fadl, Mohamed, and Philip C. Eames. "Numerical investigation of the influence of mushy zone parameter Amush on heat transfer characteristics in vertically and horizontally oriented thermal energy storage systems." Applied Thermal Engineering 151 (March 2019): 90–99. http://dx.doi.org/10.1016/j.applthermaleng.2019.01.102.

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Zakaria, Z. A., K. N. M. Hasan, M. F. A. Razak, Amirrudin Yaacob, and A. R. Othman. "Experimental Study on Tensile Strength of Butt Joints for Mild Steel with Thickness 6mm Using Gas Metal Arc Welding (GMAW)." Key Engineering Materials 740 (June 2017): 155–60. http://dx.doi.org/10.4028/www.scientific.net/kem.740.155.

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In this study, the effects of various welding parameters on welding strength in low carbon steel JIS G 3101 SS400, welded by gas metal arc welding were investigated. Welding current, arc voltage and travel speed are the variable parameters were studied in this study. The ultimate tensile strength, hardness and heat affected zone were measured for each specimen after the welding operations, and the effects of these parameters on strength were examined. Then, the relationship between welding parameter and ultimate tensile strength, hardness and heat affected zone were determined. Based on the fi

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Liu, Hui Bo, Zhi Guo Zhang, Chan Ge Liu, and Ming Xiao. "Modeling Excavation Damaged Zone for Rock Mass Parameter Identification of Underground Engineering." Advanced Materials Research 1065-1069 (December 2014): 437–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.437.

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Space-time effect of excavation damaged zone (EDZ) has great impact on identifying rock mass parameters in underground excavation engineering. In this paper, methods and models for simulating EDZ are reviewed and classified. Based on mechanism analysis, a practical model using radius-displacement-dependent deformation modulus is proposed for dynamic excavation feedback analysis. In the model, EDZ is viewed as a three dimensional heterogeneous and variable disturbing field of parameter during excavation process. Thus, deformation modulus of EDZ rock mass evolves with space-time change along wit

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Usta, Yasemin, Lisa Ng, Silvia Santantonio, and Guglielmina Mutani. "Lumped-Parameter Models Comparison for Natural Ventilation Analyses in Buildings at Urban Scale." Energies 18, no. 9 (2025): 2352. https://doi.org/10.3390/en18092352.

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This study validates a three-zone lumped-parameter airflow model for Urban Building Energy Modeling, focusing on its accuracy in estimating air change rates caused by natural ventilation, referred to here as air change rate. The model incorporates urban-scale variables like canyon geometry and roughness elements for the accurate prediction of building infiltration, which is an important variable in building energy consumption. Air change rate predictions from the three-zone lumped-parameter model are compared against results from a three-zone CONTAM model across a range of weather scenarios. T

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Wang, Wenli, Qin Shi, Xu Zhu, and Yinhua Liu. "Numerical Simulation of Microstructure Evolution in Solidification Process of Ferritic Stainless Steel with Cellular Automaton." Crystals 11, no. 3 (2021): 309. http://dx.doi.org/10.3390/cryst11030309.

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In order to study the basic principles of vibration-excited liquid metal nucleation technology, a coupled model to connect the temperature field calculated by ANSYS Fluent and the dendritic growth simulated by cellular automaton (CA) algorithm was proposed. A two-dimensional CA model for dendrite growth controlled by solute diffusion and local curvature effects with random zigzag capture rule was developed. The proposed model was applied to simulate the temporal evolution of solidification microstructures under different degrees of surface undercooling and vibration frequency of the crystal nu

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Rao Santha, Dakarapu, and Nallu Ramanaiah. "Process Parameters Optimization for Producing AA6061/TiB2 Composites by Friction Stir Processing." Strojnícky casopis – Journal of Mechanical Engineering 67, no. 1 (2017): 101–18. http://dx.doi.org/10.1515/scjme-2017-0011.

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Abstract Friction stir processing (FSP) is solid state novel technique developed to refine microstructure and to improve the mechanical properties and be used to fabricate the aluminium alloy matrix composites. An attempt is made to fabricate AA6061/TiB2 aluminium alloy composite (AMCs) and the influence of process parameters like rotational speed, transverse feed, axial load and percentage reinforcement on microstructure and mechanical properties were studied. The microstructural observations are carried out and revealed that the reinforcement particles (TiB2) were uniformly dispersed in the

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Gao, Jian, Peng Zhao, Chengxiang Zhuge, Hui Zhang, and Edward D. McCormack. "Impact of Transit Network Layout on Resident Mode Choice." Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/452735.

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This study reviews the impact of public transit network layout (TNL) on resident mode choice. The review of TNL as a factor uses variables divided into three groups: a variable set without considering the TNL, one considering TNL from the zone level, and one considering TNL from the individual level. Using Baoding’s travel survey data, a Multinomial Logit (MNL) model is used, and the parameter estimation result shows that TNL has significant effect on resident mode choice. Based on parameter estimation, the factors affecting mode choice are further screened. The screened variable set is regard

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Urban, Tadeusz, Michał Gołdyn, and Łukasz Krawczyk. "The experimental investigations of RC internal columns in the connection zone with lightweight concrete slab." Budownictwo i Architektura 12, no. 1 (2013): 187–94. http://dx.doi.org/10.35784/bud-arch.2191.

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This paper presents the problem of load carrying capacity of the columns made of high-strength reinforced concrete which are separated by slab made of lightweight concrete. The experimental investigations of three models representing the internal connection between column and flat slab made of lightweight concrete of the strength tree times less than concrete strength of column are presented. The effort degree on the punching shear capacity stands for the variable parameter in the presented study. The performed study shows that there is no effect of this parameter on the effective concrete str

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Wang, Rujia, Shiping Wu, and Wei Chen. "Unified wave equation and numerical simulation of mechanical wave propagation in alloy solidification." SIMULATION 95, no. 1 (2018): 3–10. http://dx.doi.org/10.1177/0037549718774842.

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A unified wave equation of mechanical wave propagation during solidification of an alloy was established and the numerical solution of the wave equation was obtained. A three-element model (KSLS) used to describe the stress–strain constitutive relation of the alloy in the mushy zone was established by the analysis of rheological characteristics of molten melt during solidification. Based on the KSLS model, we could describe the constitutive relation of the liquid alloy, a Maxwell medium, and of the solidified alloy, an elastic medium, by the various Lame coefficients. The wave propagation duri

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Molladavoodi, Hamed, and Marzieh Rahmati. "Dilation angle variations in plastic zone around tunnels in rocks-constant or variable dilation parameter." Journal of Central South University 25, no. 10 (2018): 2550–66. http://dx.doi.org/10.1007/s11771-018-3935-0.

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Lubini Tshumuka, Alain, Abdelkader Krimi, and Musandji Fuamba. "Modeling Heat Transfer through Permafrost Soil Subjected to Seasonal Freeze-Thaw." Land 11, no. 10 (2022): 1770. http://dx.doi.org/10.3390/land11101770.

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The present paper proposes an iterative implicit numerical method for simulating the thaw depth of permafrost soil. For this purpose, the enthalpy-porosity model was used for the phase change process, and the finite difference scheme FTCS (Forward Time Centered Space) was used for discretization. An artificial mushy zone was maintained with the same thickness by keeping the regularization parameter proportional to the temperature gradient. In doing so, we made the scheme more stable and convergence occurred faster. The model accuracy was validated by comparing the numerical results with the an

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Chirileanu, Marius Ioan, and Diana Antonia Gheorghiu. "Researches about Mechanical Characteristics of some Steels Resistance Spot Welded." Applied Mechanics and Materials 371 (August 2013): 265–69. http://dx.doi.org/10.4028/www.scientific.net/amm.371.265.

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This work studies the influence of resistance spot welding (RSW) process upon the mechanic characteristics of three steel grades: S235JR, galvanized S235JR and austenitic stainless grade 304L. The variable parameter was the welding current. Constant parameters were the pressure (6 bars) and the welding time (5 cycles). Micro hardness and tensile-shear resistance tests were done. Welded joint hardness profile reveal a relative softer nuclei surrounded by the hardest zone and a progressive decrease throughout the heat affected zone (HAZ) to the unaffected material. The shear resistance depends u

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Shi, Yuning, Kenneth J. Davis, Fuqing Zhang, and Christopher J. Duffy. "Evaluation of the Parameter Sensitivities of a Coupled Land Surface Hydrologic Model at a Critical Zone Observatory." Journal of Hydrometeorology 15, no. 1 (2014): 279–99. http://dx.doi.org/10.1175/jhm-d-12-0177.1.

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Abstract Land surface models (LSMs) and hydrologic models are parameterized models. The number of involved parameters is often large. Sensitivity analysis (SA) is a key step to understand the complex relationships between parameters and between state variables and parameters. SA is also critical to understand system dynamics and to examine the parameter identifiability. In this paper, parameter SA for a fully coupled, physically based, distributed land surface hydrologic model, namely, the Flux–Penn State Integrated Hydrologic Model (Flux–PIHM), is performed. Multiparameter and single-paramete

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Qu, Liang, Peng Wang, and Hao He. "Research on Trajectory Planning Method for Variable Sweep Back Aircraft with No Fly Zone Margin." Advances in Engineering Technology Research 10, no. 1 (2024): 276. http://dx.doi.org/10.56028/aetr.10.1.276.2024.

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For a high-speed variable sweep aircraft, the variation characteristics of lift coefficient and drag coefficient with angle of attack were analyzed. Based on the analyzed aerodynamic characteristics, an aerodynamic parameter calculation model was established with Mach number, angle of attack, and deformation rate as independent variables. A no fly zone avoidance strategy with a no fly zone margin is proposed to address the issue of some inter point trajectories not meeting the constraints of the no fly zone when using the pseudospectral method for trajectory design. Its effectiveness is verifi

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Urban, Tadeusz, Michał Gołdyn, and Łukasz Krawczyk. "Experimental investigations of reinforced concrete columns in the edge connection zone with a reinforced concrete slab." Budownictwo i Architektura 13, no. 3 (2014): 175–82. http://dx.doi.org/10.35784/bud-arch.1814.

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In this paper the results of the experimental investigations of edge column – slab connections are presented and commented on. The load transmission mechanism between high strength concrete columns and slab made of normal, five times lower strength concrete was considered. The variable parameter of presented study was the overhang of slab cantilever. The performed study showed important effect of slab cantilever on effective concrete strength of column in the connection zone.

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Chen, Xi, Shen Li, Gang Liang, and Min He. "Numerical Parameter Analysis of High-Strength Steel Frame with Y-Eccentric Brace Using Variable Replaceable Link." Buildings 14, no. 7 (2024): 2149. http://dx.doi.org/10.3390/buildings14072149.

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The present study proposes a variable replaceable link for high-strength steel frames with Y-eccentric braces designed to effectively dissipate earthquake energy by confining plastic deformation to its central zone. This unique feature allows for easy post-earthquake recovery or replacement. To investigate the seismic performance of such structures, a comprehensive finite element numerical parametric analysis is conducted using ABAQUS software. Various parameters, including the length of the central zone, replaceable link length, span, and steel grade are considered to optimize the structural

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Wan, Min, and Shanshan Huang. "Adaptive Dynamic Surface Decentralized Output Feedback Control for Switched Nonstrict Feedback Large-Scale Systems with Unknown Dead Zones." Mathematical Problems in Engineering 2020 (September 27, 2020): 1–15. http://dx.doi.org/10.1155/2020/3959806.

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This paper investigates a novel adaptive output feedback decentralized control scheme for switched nonstrict feedback large-scale systems with unknown dead zones. A decentralized linear state observer is designed to estimate the unmeasurable states of subsystems. The dead zone inverse technique is used to compensate the effect of the unknown dead zone. A variable separation approach is applied to deal with the nonstrict feedback problem. Moreover, dynamic surface control and minimal parameter learning technology are adopted to reduce the computation burden. The proof of stability and the arbit

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Buddha, Dharani, and Umakanta Nanda. "Dead Zone Minimization Using Variable-Delay Element in CP-PLL for 5G Applications." Micromachines 14, no. 1 (2022): 81. http://dx.doi.org/10.3390/mi14010081.

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The deadzone occurring in a phase-frequency detector (PFD) is a critical parameter that affects the performance of a phase-locked loop (PLL). Though a fixed-delay element reduces the deadzone, it creates an imbalance in the pulse-arrival time and among the up and down signals to the charge pump, which increases the phase noise in the output spectrum of the PLL. Therefore, in this work a new variable-delay element (VDE) is incorporated in the PFD to reduce the dead zone and consequently the phase noise of the PLL. The performance of the proposed PFD incorporated in PLL is analyzed using cadence

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Wang, X. B. "Distributions of Local Damage Variable and Local Plastic Tensile Strain and Precursors to Failure of Quasi-Brittle Pure Bending Beam." Key Engineering Materials 347 (September 2007): 447–52. http://dx.doi.org/10.4028/www.scientific.net/kem.347.447.

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For many quasi-brittle materials (such as rock, ceramic and concrete) in pure bending state, the material on the tensile side will fail firstly since the compressive strength can be ten times the tensile strength. After tensile strain localization zone is initiated in the midspan of the beam, its propagation direction will be perpendicular to the neutral axis. In the paper, using nonlocal theory or gradient-dependent plasticity, the distributions of local plastic tensile strain and local damage variable in tensile strain localization zone of a pure bending beam are analyzed theoretically. The

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Arif, Md Ariful Islam, and M. Osman Gani. "Numerical Bifurcation Analysis to Study Periodic Traveling Wave Solutions in a Model of Young Mussel Beds." GANIT: Journal of Bangladesh Mathematical Society 38 (January 14, 2019): 1–10. http://dx.doi.org/10.3329/ganit.v38i0.39781.

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Self-bottomed mussel beds are dominant feature of ecosystem-scale self-organization. Regular spatial patterns of mussel beds in inter-tidal zone are typical, aligned perpendicular to the average incoming tidal flow. In this paper, we consider a two-variable partial differential equations model of young mussel beds. Our aim is to study the existence and stability of periodic traveling waves in a one-parameter family of solutions. We consider a parameter regime to show pattern existence in the model of young mussel beds. In addition, it is found that the periodic traveling waves changes their st

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Argatov, Ivan I., Joon Woo Bae, and Young Suck Chai. "A Simple Model for the Wear Accumulation in Partial Slip Hertzian Contact." International Journal of Applied Mechanics 12, no. 07 (2020): 2050074. http://dx.doi.org/10.1142/s175882512050074x.

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A two-dimensional wear contact problem with a stick zone is considered for a Hertzian cylindrical contact configuration and Archard’s equation of wear. A one-free-parameter simple model for the wear volume accumulation during the reciprocating wear process, which occurs in two symmetric variable slip zones, is developed and validated against numerical solutions available in the literature. The developed model takes into account the observed effect of non-monotonic evolution of the friction dissipated energy. The presented analytical modeling framework does not make use of any fitting parameter

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Febriarta, Erik, Ajeng Larasati, Dhandhun Wacano, and Ika Suherningtyas. "PENENTUAN ZONA KERAWANAN GERAKAN TANAH DENGAN METODE HEURISTIK DAS SERANG KABUPATEN KULON PROGO (Determination of mass movement vulnerability zone using heuristic methods in Serang watershed Kulon Progo District)." Jurnal Penelitian Pengelolaan Daerah Aliran Sungai 6, no. 1 (2022): 1–20. http://dx.doi.org/10.20886/jppdas.2022.6.1.1-20.

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Landslide, one of the physical environmental disasters, can be defined as the movement of rock mass, soil, or shredded material that forms a slope down the slope Kulon Progo Regency has always been a landslide-prone area that most often occurs in the Special Region of Yogyakarta in the last three years. One way to reduce the risk of hazards is by mapping the hazard assessment of mass movement disasters. The purpose of this study is to determine the zone of vulnerability to landslides in the Serang watershed, Kulon Progo. The method used is heuristic, where the assessment of the potential for g

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Liu, Yanhua, Xiaojie Wu, Yu Zhang, Na Li, and Hua Luan. "Evaluation of Variable Parameter Active Demons Algorithm-Based Diffusion Tensor Imaging on Ventricular Remodeling after Myocardial Infarction and Nursing." Scientific Programming 2021 (August 25, 2021): 1–8. http://dx.doi.org/10.1155/2021/6419240.

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This study aimed to explore the effect of diffusion tensor imaging (DTI) image registration algorithm in the evaluation of ventricular remodeling in patients with myocardial infarction and the therapeutic effect of cross-theoretical model rehabilitation exercise care. The dynamic balance coefficient k was introduced to construct the DTI image registration algorithm k-AD based on the variable parameter AD algorithm. Then, it was compared with demons algorithm and AD algorithm and was applied in 110 patients with acute myocardial infarction. All patients were divided into the 55 cases of experim

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Petry, Alice, Pasquale Gallo, Heikki Remes, and Ari Niemelä. "Optimizing the Voce–Chaboche Model Parameters for Fatigue Life Estimation of Welded Joints in High-Strength Marine Structures." Journal of Marine Science and Engineering 10, no. 6 (2022): 818. http://dx.doi.org/10.3390/jmse10060818.

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This work studies the Voce–Chaboche (V–C) material model parameter optimization for high-strength steel welded joints subjected to cyclic loading. The model parameters of each material zone in a S690 steel butt-welded joint were determined using an optimization algorithm based on the Newton trust region (NTR) method and an accumulated true strain parameter. The model parameters were fitted to stress–strain histories from uniaxial strain-controlled cyclic tests. To validate the model, fully-reversed variable amplitude fatigue experiments were performed under load control. The experimental resul

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