Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Mixture theory"”.
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A CONTINUUM MIXTURE THEORY APPROACH TO SEDIMENT TRANSPORT WITH APPLICATION TO TURBULENT OSCILLATORY BOUNDARY LAYERS
… transport models starting from the continuum theory of immiscible mixtures (also know as two-phase flow theories). The other is a comparison with experimental data of numerical predictions from a number of turbulence models for oscillatory, turbulent boundary layer flow containing suspended …
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A coupled, two-phase fluid-sediment material model and mixture theory implemented using the material point method
… form of the basic balance laws for two-phase mixtures. This model is formulated to capture the (i) viscous inertial rheology of wet grains under steady shear, (ii) the critical state behavior of granular materials under shear, (iii) the viscous thickening of fluid due to the presence of …
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Modeling microwave heating of apple cylinders using hybrid mixture theory based transport equations coupled with Maxwell's laws of electromagnetism
… and temperature profiles. Two-scale hybrid mixture theory (HMT) based transport equations were utilized to describe the fluid (water & gas phases) transport during the microwave drying of apple cylinders. Maxwell’s electromagnetic equations were coupled with HMT based transport equations to …
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A three constituent mixture theory model of cutaneous and subcutaneous tissue in the context of neonatal pressure ulcer etiology and prevention
… time-varying loading. In this study, a triphasic mixture theory model with constituents of extracellular matrix, interstitial fluid, and blood was calibrated and validated and used to investigate stress and fluid velocity under quasi-static and time-varying loading conditions, respectively. Four …
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Modeling of transport mechanisms and quality changes during the microwave frying of foods by solving hybrid mixture theory-based unsaturated transport equations coupled with maxwell's equations of electromagnetism
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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Developing Constitutive Laws for the Endothelial Glycocalyx Layer
… asymptotic model for the EGL based on biphasic mixture theory which has been used to model the EGL in the literature previously. In the physiological regime, the EGL has an extremely low permeability, making solution of the biphasic mixture theory equations computationally challenging. Using the …
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A framework for damage modeling in multi-constituent laminated materials
… two methods discussed throughout the document: mixture theory to discuss the evolving curing and thermal effects on the structural behavior of a fiber reinforced laminate structure and a Discontinuous Galerkin method with return mapping algorithms to allow for damage when undergoing large …
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A variational multiscale computational framework for reaction-dominated thermo-chemo-mechanical process modeling in multi-constituent material systems
… systems is presented in the context of mixture theory. Derivation starts from constituent-wise equations for balance of mass, momentum, and energy, accounting for energy in formation and breaking of chemical bonds. Interactions between different constituents are captured through …
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Multiscale modeling of moisture transport coupled with quality changes in selected foods
… glass transition were incorporated using hybrid mixture theory (HMT)-based multiscale modeling approach (Chapter 2). It is important to understand the viscoelastic properties of cereals since they affect product texture as a result of moisture transport. The stress relaxation behavior of oat …
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Measurements and analysis of the microwave dielectric properties of tissues
… may be calculated for a given tissue type. Mixture equations may be used to describe the dielectric properties of two-phase mixtures in terms of the dielectric properties and volume fractions of the component phases. Biological tissues are very much more complex than these two phase models. …
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Theory of Detonation Structure for Two-Phase Materials
… Ordinary differential equations from continuum mixture theory have been solved numerically to determine steady wave structure. In the limiting case where there is no chemical reaction and no gas phase effects, the model describes inert compaction waves. The equations predict detonation structure …
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An overview of models for porous media of biomechanical interest
We study a biological tissue as a biphasic material composed of several constituents allowed to be transferred from one phase to the other . Our porpuse in the following chapters is to give an overview of the most fundamental problems of biomechanical and biophysical interest, retracing the state …
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Modelling the Endothelial Glycocalyx Layer
… boundary-integral representation for Biphasic Mixture Theory, which allows us to efficiently solve elastohydrodynamicmobility problems using Boundary Element Methods. In this context, we examine the impact of geometry upon creation of viscous eddies, fluid flux into the EGL, as well as the role …
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Modeling phase transformations in single and polycrystalline aggregate and grain growth
… polynomials in order parameters to a linear mixture theory for material properties, and (iv) designation of the total martensite volume fraction as the primary order parameter governing material instability, with the volume fractions of individual variants treated as internal variables. …
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Splitting solution scheme for material point method
… formulation is presented within the framework of mixture theory. Comparing the numerical results for the one-dimensional consolidation problem shows that the proposed incompressible MPM algorithm provides a stable and accurate pore pressure field even without implementing damping in the solver. …
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Characterization and deterioration detection of Portland cement concrete using electromagnetic waves over a wideband of frequency
… to segregation. After testing several mixture theories to identify the most appropriate theory that is capable of predicting the dielectric constant of PCC (based on the dielectric properties of its components), Bruggemenn mixture theory was found to be the most feasible.
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Two-scale modeling of transport mechanisms and quality changes during frying of foods
… in affecting the quality of the product. Hybrid mixture theory (HMT) based multiscale modeling approach was employed to study transport mechanisms during frying of snack foods. Multiscale simulations studies on the frying of rice crackers and chicken nuggets provided useful information about the …
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A unified computational framework for process modeling and performance modeling of multi-constituent materials
This Dissertation was approved for publication on 2016-09-06 at 08:58.
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Multiscale modeling of transport mechanisms and quality changes in frozen foods during freeze-thaw cycles
… gathered from traditional experiments. A hybrid mixture theory-based multiscale model was applied to predict phase change, fluid, species and heat transfer, crystal growth, and thermomechanical effects inside the frozen products during freezing. A solution scheme for the two-scale unsaturated …
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