Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Modeling the Internal Pressure Distribution of a Fuel Cell

P.A. Koski[1] and M.S. Mikkola[1]
[1]Department of Applied Physics, Helsinki University of Technology, Espoo, Finland

A 3D FEM (Finite Element Method) model for predicting the internal pressure distribution of a fuel cell stack is presented. The model includes contact pair boundary conditions between the most critical components, thermal expansion and Young's moduli as a function of temperature. The model is used to investigate the changes in pressure distribution inside a PEM fuel cell at realistic ...

Local Conduction Heat Transfer in U-pipe Borehole Heat Exchangers

J. Acuna[1] and B. Palm[1]

[1]Department of Energy Technology, KTH, Stockholm, Sweden

The most common way to exchange heat with the bedrock in Ground Source Heat Pump (GSHP) applications is circulating a fluid through a U-formed closed loop in vertical boreholes drilled several tenths of meters into the ground. This study presents and compares the results of eight cross sectional U-pipe Borehole Heat Exchanger configurations. Values from recent experimental temperature ...

Modeling of Highly Stable Thermal Environment Using COMSOL

A. Alfauwaz, and K. Sun
Stanford University, Stanford, CA, USA

Precise physics experiments in space require highly stable thermal environments, especially if the experiments are targeted in earth orbits where eclipses will cast large temperature variation. We have been designing and modeling a thermal system with sub micro-kelvin stability using COMSOL. Our design is comprised of multiple alternative layers of conductive materials and vacuum ...

Advancements in Carbon Dioxide and Water Vapor Separations Using COMSOL

J. Knox[1], K. Kittredge[1], R.F. Coker[1], R. Cummings[1], C.F. Gomez[1]
[1]NASA - Marshall Space Flight Center, Huntsville, AL, USA

“NASA\'s Advanced Exploration Systems (AES) program is pioneering new approaches for rapidly developing prototype systems, demonstrating key capabilities, and validating operational concepts for future human missions beyond Earth orbit” [1]. Under the new Atmosphere Revitalization Recovery and Environmental Monitoring (ARREM) project [2], efforts are focused on improving current state-of-the-art ...

The Hygro-Thermal Improvement of a Mounting System to Fasten Roof Workmen to Flat Roofs - new

H. L. Schellen[1]
[1]Eindhoven University of Technology, Eindhoven, The Netherlands

A Dutch firm manufactures a mounting system to fasten roof workmen to the roof of a flat roof building to prevent them from falling down from the roof. The system is mounted to the flat roof afterwards, i.e. after the completion of the thermal insulated roof. Because of the mechanical strength and stiffness properties of the system, it is manufactured using (stainless) steel. The steel, ...

Thermal Performance of a Deviated Deep Borehole Heat Exchanger: Insights from a Synthetic Heat and Flow Model

M. Le Lous [1], F. Larroque [1], A. Dupuy [1], A. Moignard [2]
[1] ENSEGID, Bordeaux, France
[2] Fonroche Géothermie, Pau, France

Earth heat exchangers are drawing increasing attention and popularity due to their efficiency, sustainability and universality. In addition, DBHE can offer higher temperatures and more return on investment than conventional system. DBHE is also an alternative to geothermal power generation or to direct use applications in an extreme engineered (or enhanced) geothermal systems (EGS). However, the ...

Tunnels, a New Potential Source of Energy: 3D Modeling of a Heat Exchanger within Tunnel Lining

C. Soussi [1], O. Fouché [2], G. Bracq [3], S. Minec [3],
[1] Le Cnam, Paris, France
[2] Ecole des Ponts, Champs-sur-Marne, France
[3] Bouygues Construction, Saint-Quentin-en-Yvelines, France

This work investigates the possibility of thermal activation of future tunnels to heat and/or cool the surface buildings or infrastructure such as subways stations. The principle is to insert pipes in the tunnel lining segments, which are connected to a geothermal pump. A heat transfer fluid antifreeze circulates inside the tubes to exchange heat with the surrounding environment (tunnel air and ...

Glass Transition of ABS in 3D Printing

M. Rahman [1], N. R. Schott [2], L. K. Sadhu [3],
[1] North South University, Dhaka, Bangladesh
[2] Department of Plastics Engineering, University of Massachusetts - Lowell, Lowell, MA, USA
[3] IRays Teknology Ltd., Dhaka, Bangladesh

In a commercial 3D printer head, plastic ribbon passes through a hot nozzle of an extruder to dispense liquid plastic droplets to construct the model. In this paper a 2D axisymmetric model of a 3D head is considered to study the secondary transition change from below the glass temperature to above the glass-transition temperature of ABS (Acrylonitrile Butadiene Styrene) using COMSOL ...

FEM Analysis of Micromachined Flow Sensor with Wheatstone Bridge Read-out

A. Talic[1], S. Cerimovic[1], F. Kohl[1], R. Beigelbeck[1], F. Keplinger[2], and J. Schalko[1,2]
[1]Research Unit for Integrated Sensor Systems, Austrian Academy of Sciences, Wr. Neustadt, Austria
[2]Institute of Sensor and Actuator Systems, Vienna University of Technology, Vienna, Austria

In this work, we present simulations of a novel micromachined calorimetric flow sensor using COMSOL Multiphysics. The sensor is based on four germanium thermistors that serve as heat sources and as temperature sensors simultaneously. In operational mode, the heated membrane is cooled by any passing flow and the local cooling rate depends on the flow velocity. The simulation results demonstrate ...

3D Stationary and Temporal Electro-Thermal Simulations of Metal Oxide Gas Sensor Based on a High Temperature and Low Power Consumption Micro-Heater Structure

N. Dufour[1], C. Wartelle[2], P. Menini[1]
[1]LAAS-CNRS, Toulouse, France
[2]Renault, Guyancourt, France

The aim of this work was to simulate the electro-thermal behavior of a micro-hotplate used as a gas sensor, in order to compare the obtained results with a real structure. The structure has been designed in 3D and a stationary and a temporal study has been realized.