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.

Design of Cooling System for Electronic Devices Using Impinging Jets

P. Lin[1], C. Chang[2], H. Huang[3], and B. Zheng[4]
[1]Mechanical and Aerospace Eng., Rutgers, The State University of New Jersey, Piscataway, NJ
[2]FTR Systems (Shanghai) Inc., Shanghai, China
[3]PolarOnyx, Inc., San Jose, CA
[4]School of Mechatronics Eng., University of Electronic Science and Technology of China, Chengdu, China

The heat sink designs using impinging liquid jets, which form stagnation flows, feature uniform heat transfer coefficients, and provide thin thermal boundary layers, are studied to reduce the heat from GPUs. Three different designs using central, micro, and uniform-cross-section (UCS) central jets are studied and simulated in COMSOL. The efficiency factors, defined as the ratio of total ...

Using a Level-Set Model to Estimate Dwell Time in a Vacuum Dewatering Process for Paper

K. Rezk[1]
[1]Department of Energy, Environmental and Building Technology, Karlstad University, Kronoparken, Sweden

Water removal during paper manufacturing is an intensive energy process. The dewatering process generally consists of four stages in which the first three stages, water is removed mechanically through vacuum pulses and pressing.The fourth stage involve thermal drying. The vacuum dewatering process has been considered in this work. A laminar level-set method has been applied in order to capture ...

Multiphysics Simulations of Granular Sludge on the Optimization of Effluent Treatment Plant

S. Gunsekaran [1], R. C. Thiagarajan[1]
[1]ATOA Scientific Technologies Private Limited, Bangalore, India

Multiphysics Simulations of Physico-chemical and Biological Treatment of wastewater is increasing due to the demand for cost efficient plant design and utilization. Among the many processes, a thorough understanding of the settling behavior of an activated granular sludge in the secondary settler of an Effluent Treatment Plant (ETP) is critical for the plant designers to determine the efficiency ...

Simulation of Constant-Volume Droplet Generators for Parallelization Purposes

D. Conchouso [1], A. Arevalo [1], D. Castro [1], Y. Ying [1], I. G. Foulds [2]
[1] King Abdullah University of Science and Technology, Thuwal, Makkah, Saudi Arabia
[2] School of Engineering, University of British Columbia - Okanagan, Vancouver, BC, Canada

To maintain same droplet size across parallel devices, new break-up strategies based on geometry are been studied. In this work, we model a geometrically-set droplet generator, in which the droplet break-up occurs by a block and break mechanism. In other words when the disperse phase blocks the path of the continuous phase, droplet formation occurs. The devices showed consistent droplet ...

Mathematical Formulation of a PEM Fuel Cell Model

E. Robalinho [1], E. F. Cunha [2], M. Linardi [2], E. I. Santiago [2],
[1] Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN, São Paulo, SP, Brazil; and Instituto Federal do Rio Grande do Sul - IFRS, Porto Alegre, RS, Brazil
[2] Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN, São Paulo, SP, Brazil

The idea of a friendly implementation of a mathematical formulation using specialist software was performed with the support of COMSOL Multiphysics® software with Chemical Reaction Engineering and Batteries & Fuel Cell Modules. The real problem of a Proton Exchange Membrane – PEM fuel cell modeling involves different scales, multiple variables and processes, coupling of solvers and experimental ...

Convergence Rates For Models With Coupled 1D / 2D Subdomains

A. Bradji[1], E. Holzbecher[2], and M.S. Litz[2]
[1]Department of Mathematics, University of Annaba, Algeria
[2]Georg-August Universität Göttingen, Germany

It is well known that the convergence rate of a numerical model is significantly reduced, when the genuine character of the setting with differential equation and boundary condition is not given anymore. Here we examine the decrease of convergence order for models using COMSOL in which the problem set-up includes a coupling between a 1D and a 2D subdomain. In terms of physics we are dealing with ...

Multi-Dimensional Adsorption Model of CO2/H2O Sorbent Bed

C. Gomez [1], R. F. Coker [1], J. Knox [1], G. Schunk [1]
[1] NASA MSFC, Huntsville, AL, USA

The primary interest of the VC (Vacuum Characterization) test is to experimentally characterize the adsorption and vacuum desorption of CO2 and water vapor of a pelletized sorbent bed in a large diameter column. The VC test article is shown in Figures 1 and 2. The aluminum canister is 3” in diameter and approximately 8” long allowing for variable sorbent bed loads from 1” to 6” in length. A ...

Multi-Dimensional Simulation of Flows Inside Mono and Polydisperse Packed Beds

R.G. Schunk [1], J. C. Knox [1], K. Son [1, 2], R. F. Coker [1],
[1] NASA Marshall Space Flight Center, Huntsville, AL, USA
[2] Purdue University, West Lafayette, IN, USA

An analysis to quantify the flow inside the narrow channels of an ISS (International Space Station) CDRA (Carbon Dioxide Removal Assembly) adsorbent bed is presented. The CDRA contains two pelletized adsorbent beds to remove CO2 respired by the crew. Heaters and associated fins inside the adsorbent beds form many small parallel channels which are rectangular in cross section. The channels are ...

Analysis of Ancient Natural Ventilation Systems inside the Pitti Palace in Florence

C. Balocco
Dipartimento di Energetica “Sergio Stecco”, Università degli Studi di Firenze, Firenze, Italy

This paper presents and discusses the first phase results of a wide ranging project concerning the study and prediction of the efficiency and energy performances of natural ventilation systems existing inside historic buildings. The air flow patterns, air temperature and air velocity distribution inside a historic building in Florence, the Pitti Palace, were studied by a transient simulation. A ...

Determination and Verification of the Forchheimer Coefficients for Ceramic Foam Filters using COMSOL CFD Modeling

M.W. Kennedy[1], K. Zhang[1], J.A. Bakken[1], R.E. Aune[1]
[1]Norwegian University of Science and Technology, Trondheim, Norway

Experiments have been conducted with water at velocities from ~0.015-0.77 m/s to determine the permeability of 50 mm thick commercially available 30, 40, 50 and 80 Pores Per Inch (PPI) Ceramic Foam Filters (CFF) used for liquid metal filtration. Measurements were made using two different setups, for use with the Forchheimer equation: 49 mm \"straight through\" and 101 mm diameter \"expanding ...