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Generalized Kelvin Viscoelastic Material

The behavior of viscoelastic materials can be represented by conceptual models composed of elastic and viscous elements connected in series or in parallel. The rheology of the generalized Kelvin model (also called generalized Kelvin-Voigt model) consists of an elastic spring to represent the instantaneous stiffness plus n Kelvin-Voigt branches connected in series. This example shows how to ...

Lithium-Ion Battery Impedance Application

The goal with this application is to explain experimental electrochemical impedance spectroscopy (EIS) measurements and to show how you can use a simulation app along with measurements to estimate the properties of lithium-ion batteries. The Lithium-Ion Battery Impedance app takes measurements from an EIS experiment and uses them as inputs. It then simulates these measurements and runs a ...

Temperature Field in a Cooling Flange

A cooling flange in a chemical process is used to cool the process fluid, which flows through the flange. The surrounding air cools the flange via natural convection. In the stationary model, the forced convection to the process fluid is modeled using a constant heat transfer coefficient. The natural convection cooling is modeled using tabulated empirical transfer coefficients that are ...

Terzaghi Compaction

Fluids that move through pore spaces in an aquifer or reservoir can shield the porous medium from stress because they bear part of the load from, for instance, overlying rocks, sediments, fluids, and buildings. Withdrawing fluids from the pore space increases the stress the solids bear, sometimes to the degree that the reservoir measurably compacts. The reduction in the pore space loops back and ...

Thermal Drift in a Microwave Cavity Filter

Microwave filters are used to eliminate unwanted frequency components in the output from microwave transmitters. They are typically inserted between a power amplifier and an antenna. The amplifiers are nonlinear and produce harmonics that must be eliminated with filters that have a rather narrow passband. Due to high power loads but also possibly from harsh environmental conditions (such as a ...

Galvanic Corrosion of a Magnesium Alloy in Contact with Steel

Magnesium alloys are attractive alternatives as lightweight materials in various fields of engineering. Magnesium is however relatively non-noble and may suffer considerable galvanic corrosion when being used in conjunction with other metals, for instance when mounting an Mg alloy component using steel fasteners. This model example simulates a galvanic corrosion couple consisting of a magnesium ...

Stefan Tube

This example illustrates the use of the Maxwell-Stefan diffusion model available with the Transport of Concentrated Species interface. It models multicomponent gas-phase diffusion in a Stefan tube in 1D. In this case, it is a liquid mixture of acetone and methanol that evaporates into air. The concentration profiles are modeled at steady-state and validated against experimental data by Taylor ...

Primary Current Distribution in a Lead-Acid Battery Grid Electrode

This 3D model example demonstrates the use of the Primary Current Distribution interface for modeling current distributions in electrochemical cells. In primary current distribution, the potential losses due to electrode kinetics and mass transport are assumed to be negligible, and ohmic losses are govern the current distribution in the cell. Here you investigate primary current distribution in ...

Molecular Flow Through an S-Bend

This model computes the transmission probability through an s-bend geometry using both the angular coefficient method available in the Free Molecular Flow interface and a Monte Carlo method using the Mathematical Particle Tracing interface. The computed transmission probability by the two methods is in excellent agreement with less than a 1% difference. This model requires the Particle Tracing ...

Polarizing Beam Splitter

Polarizing beam splitter cubes consist of two right-angled prisms where a dielectric coating is applied to the intermediate surface. The cube transmits part of the incident wave while reflecting the other part. An advantage of using this cube design, instead of a plate design, for beam splitters is that ghost images are avoided. This new app demonstrates the basic MacNeille design, which ...