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.

COMSOL Multiphysics® 在热发电用真空集热管设计中的应用

赵旭山 [1], 郝雷 [1], 蒋利军 [1], 米菁 [1], 杨海龄 [1],
[1] 北京有色金属研究总院,北京,中国

随着能源紧张、油价攀升,环境污染严重,利用可再生绿色能源又成为不懈努力的方向。槽式太阳能热发电技术具有兼容性强、对电网冲击小、性价比高、发电成本低、可存储可调度等特点,近年来得到了迅猛发展,其核心部件为高温太阳能真空集热管,如图1所示。本研究利用 COMSOL Multiphysics® 针对真空集热管真实工况下的动态过程开展研究,并在此基础上开展集热管结构的优化设计。 由图1可知:集热管在电站中服役工况下,槽面会聚的太阳光主要集中于集热管下半面,上半面接收的会聚太阳光较少;导热工质自吸收管一端进入,接收会聚太阳光辐照能量,从吸收管另一端流出,流入→流出过程中,导热工质被加热;集热管外表面与外部环境通过热辐射和对流两种方式换热;吸收管与玻璃罩管间形成的环形密闭高真空区域各内表面通过热辐射换热,不考虑对流;集热管两端支撑固定于聚光器上,由于本身自重和热应力 ...

Numerical Investigation of Micronozzle Performance for Various Nozzle Geometries - new

P. A. Haris[1], T. Ramesh[1]
[1]National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, India

Design and manufacture of thrusters for producing very low thrust force in the range of milli or micro newtons using micronozzles has been actively developed in the last decade. The nature of propellant flow in such micronozzles differs from that of macro nozzles. In micronozzles, viscous effect dominates; hence the flow is always in laminar regime with high viscous losses. Objective of this ...

Simulating Forced Convection in a Bingham Plastic Fluid

E. Tejaswini [1], B. Sreenivasulu [1], B. Srinivas [1],
[1]Gayatri Vidya Parishad College of Engineering, Visakhapatnam, Andhra Pradesh, India

In this work, the heat transfer characteristics of two heated cylinders of square cross-section immersed in a streaming Bingham plastic medium have been studied. The governing differential equations (continuity, momentum and thermal energy) have been solved numerically over wide range of conditions as: plastic Reynolds number, 0.1 ≤ Re ≤ 40, Prandtl number, 1 ≤ Pr ≤ 100, Bingham number, 0 ≤ Bn ≤ ...

Numerical Solutions for the Lévêque Problem of Boundary Layer  Mass or Heat Flux

E. Holzbecher
Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin, Germany

The Lévêque problem is an idealized simple situation concerning the influence of the boundary on the distribution of temperature or mass in Hagen-Poiseuille flow. Here, the performance of numerical solutions is examined for a range of Péclet numbers, spanning 11 orders of magnitude. We examine the Sherwood, resp. Nusselt numbers and confirm the cubic square rule for high flow ...

Coupled Electric-Thermal-Fluid Analysis of High Voltage Bushing

G. Eriksson[1]
[1]ABB, Corporate Research, Västerås, Sweden

Modern power transmission systems are in general designed to operate at high voltages in order to reduce resistive losses generated by high currents. This, however, tends to increase the risk for dielectric breakdown or flashovers if the equipment is not properly designed to withstand the stress. The present work illustrates how multiphysics simulations can be used to analyze and predict the ...

Hydrophone Acoustic Receiver Modeling: Turbulent Flow Modeling and Acoustic Analysis - new

D. Groulx[1], A. Bharath[1], S. Campbell[1]
[1]Department of Mechanical Engineering, Dalhousie University, Halifax, NS, Canada

The field of underwater acoustics research is constantly growing with the ongoing improvement of acoustic measuring techniques. An acoustic hydrophone receiver is a passive listening device which is widely used in biological research and sonar technology. The hydrophone however suffers from turbulence generated noise created by its presence in ever faster flow. This work aims to analyze the ...

Boundary Value Effects on Migration Patterns in Hydraulically Fractured Shale Formations - new

T. Aseeperi[1]
[1]Department of Chemical Engineering, University of Arkansas, Fayetteville, AR, USA

During the hydraulic fracturing process, there can be possible re-activation of closed/sealed faults and natural fractures in the formation, which may lead to changes in the boundary conditions of the reservoir. While study models of shale gas formations have utilized the concept of a closed reservoir in order to optimize the production of gas in the well-bore, this assumption cannot be adopted ...

激光熔覆过程中的传热传质研究

甘政涛 [1],
[1] 中国科学院力学研究所,北京,中国

基于 Level-Set 界面跟踪方法建立了激光熔覆过程的三维瞬态数值模型,研究了瞬态熔化和凝固过程中传热传质的演化规律。该模型使用 Level-Set 方法跟踪熔池气/液界面,采用焓-多孔度(enthalpy-porosity)方法得到了固/液界面之间的糊状区,并考虑了质量添加、材料熔化/凝固、热毛细效应(Marangoni效应)、浮力效应、活性元素质量传输等对熔池流动和界面的影响。通过该模型,具体分析了质量添加、力和界面平衡条件对熔池气/液界面的影响,以及由熔池温度/浓度分布引起的热毛细效应、金属材料的熔/凝过程和熔池流动形式对熔池固/液界面的影响。结果表明:熔池的气/液界面主要由力平衡条件决定,截面近似为圆弧型,其尺寸与单位时间的质量添加量相关。熔池的固/液形态由于熔池的表面温度梯度和表面活性元素含量共同引起的熔池流动方向和速度的变化,出现三种不同的类型,分别为下凹型(熔池内流) ...

Simulation of Interstitial Nanoparticle Flow for Development of Tumor-On-A-Chip Device

J. Park [1], M. P. Vidal-Meza [1], R. Zhou [1], S. Barua [1], C. Wang [1],
[1] Missouri University of Science & Technology, Rolla, MO, USA

A simulation was performed to investigate the flow behaviors of drug delivery nanoparticles in a tumor-on-a-chip microfluidic device, which mimics a tumor cell having endothelial cells with micro-sized gaps. The Navier-Stokes equation and the convection-diffusion equation were used to model the flow field and the time-dependent particle distribution in the device, respectively. We investigated ...

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 ...