In a chemical reaction-diffusion system with three species, the interaction between diffusion and a fast reaction between two species creates a transient, sharp, internal interface. Besides the three species model, we use a two component model that is equivalent in the asymptotic limit as the reaction becomes infinitely fast. We use COMSOL Multiphysics for the simulations and use the time-depen...

--MEMS based mass sensors are being designed to identify the small amounts of materials especially for monitoring the food supply. The Fabrication of MEMS includes deposition of material layers, pattering by photolithography and etching to produce the required shapes, consequently leading to time taking and expensive method. In order to reduce the working time of sensor to market a Finite eleme...

Digital Microfluidic Biochips (DMFBs) have been widely used in Lab-on-a-Chip (LoC) for disease diagnosis and treatment applications. Biological sample to be processed are originally analog continuous flow. To convert it into digital droplets for DMFB processing, a microfluidic droplet dispenser acting as an analog-to-digital converter (ADC) is needed. In this paper, a highthroughput analog-to-d...

Underwater acoustic signals need transducers to generate and detect signals with high power, linearity, dynamic-range and beamwidth. Among a variety of transducer designs, a Tonpilz transducer stands out for power and long-range applications. A Tonpilz transducer for underwater acoustic signaling is developed to scale and analyzed using FEM tools with Comsol. The underlying pressure-acoustics a...

In this study, the flow channels of a PEM fuel cell are fabricated by the EMM process. The parametric effects of the process are studied by both numerical simulation and experimental tests. For the numerical simulation, the multiphysics model, consisting of electrical field, convection, and diffusion phenomena is applied using COMSOL software. COMSOL software is used to predict the parametric e...

Abstract IGBT, as the core device of high-capacity power electronic equipment, its stability is directly relevant to normal operation equipment. It would cause system failure and major security incidents if aging phenomenon occurs. A complex multi-physical field coupling process involved in IGBT. Based on Comsol software, this paper conducts a series simulations IGBT module model SKM50GB12T4, a...

A Normal Mode Analysis of the Chesapeake Bay has reached the phase of performing time-series analysis. Prior attempts using generalized eigenfunctions obtained from COMSOL have led to extraction of power spectra using a partial domain extraction and a waveletlike correction to the result. A new approach has been developed which effectively solves the spatial equivalent of the Initial Value Prob...

Determining the changes in passive electrical properties of human tissues and the geometry changes of the body parts due to breathing and cardiac activity could be a method for monitoring these vital signs. We have designed a model with COMSOL Multiphysics to simulate a magnetic induction method for determining changes of these characteristics. Given the large number of parameters and variables...