E. Luz, D. M. P. Cunha, V. H. C. Lemos
Universidade Federal do Pará - UFPA, Belém, PA, Brasil; Centro de Instrução Almirante Braz de Aguiar - CIABA, Belém, PA, Brasil
Centro de Instrução Almirante Braz de Aguiar - CIABA, Belém, PA, Brasil
The phenomenon of cavitation can severely affect the working of valves used to control liquid flow. Cavitation occurs when the pressure is reduced and the water evaporates, forming bubbles. When bubbles pass into an area of higher pressure, they condense and collapse, releasing a large amount of energy able to removing the surface layers of the material. In this work, we model the effects of ...
F. Wirth , K. Wegener ,
 IWF, ETH Zürich, Switzerland
Additive manufacturing is attracting more and more interest. Laser Cladding is one of these additive manufacturing processes. For this a quasi-stationary physical based 3D process model is presented, which has been developed taking into account heat transfer, melt pool fluid flow including surface tension effects (Marangoni convection) and free surface movement. Thereby the resulting surface ...
A. Daoud, and N. Kandev
Institut de recherche d'Hydro-Quebec (LTE), Shawinigan, Quebec, Canada
The electromagnetic pumping (EMP) of electrically-conducting fluid is of growing interest for many industrial applications requiring precise flow control, enabling stopping or reversing flow direction without any moving parts or mechanical devices. Presented in this work are the results of a 3D numerical magneto-hydrodynamic (MHD) simulation of direct current (DC) EMP for liquid ...
S. Thennavarajan, P. Jeyaraj , L. P. Manikandan , S. S. Kulkarni , S. Jana ,
Department of Mechanical Engineering, NITK, Surathkal, Mangalore, Karnataka, India
CSIR- National Aerospace Laboratories, Bengalore, Karnataka, India
The high speed gas turbine is a power plant developed for modern aircrafts. It is widely used and developed because it can meet the high power to weight ratio. The rotor system of modern small gas turbine works above the critical speeds. Hence, there is a stricter requirement for the control and isolation of vibration magnitude under heavy unbalance load and passing through critical speeds. An ...
S. Cortés, D. Güemes, R. Ávila
Universidad Nacional Autónoma de México, Mexico City, Mexico
The study of low Reynolds number flow around air vehicles of the order of centimeters. According to DARPA, a NAV is defined as a vehicle with 7.5 cm of length and weight of 20 grams. We calculated the flow around a small length scale 3D rigid body with complex geometry. Firstly we perform the numerical simulation of the two dimensional flow around a circular cylinder for 30< ReD
Optimization of the Herringbone Type Micromixer Using Numerical Modelling and Validation by Measurements - new
E. Tóth, K. Iván, P. Fürjes
Pázmány Péter Catholic University, Budapest, Hungary
Research Centre for Natural Sciences Institute for Technical Physics and Materials Science Hungarian Academy of Sciences, Budapest, Hungary
COMSOL Multiphysics® software was used in this study to simulate mixing by diffusion and by secondary flow. Particle tracing model was applied to simulate the mixing of cells in the microchannel. Results agreed well with the measurement, an optimal herring-bone structure was proposed for integration into a bioanalytical system.
Control the Poly-Dispersed Droplet Breakup Mode in a Droplet-based Microfluidic Device by External Electric Field
Y. Li , K. Nandakumar , M. Jain ,
 Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, USA
Droplet–based microfluidics has received special research attentions in last two decades due to its superior control over fluid flow as well as other unique advantages. By introducing two immiscible fluids into microfluidic systems, the reagent fluid is encapsulated inside discrete droplets or slugs of nanoliter volume . Interestingly, two breakup modes, termed as “mono-dispersed” and ...
D. C. Raharja , R. E. Hincapie , M. Be , C. L. Gaol , L. Ganzer ,
 Clausthal University of Technology, Clausthal-Zellerfeld, Germany
Aqueous polymers used for enhanced oil recovery (EOR) application is considered a complex fluid. It can exhibit Newtonian and Non-Newtonian behavior depending on the velocity or the stresses that it is submitted during the flooding process. Therefore, the polymer flooding project requires a detailed understanding of chemical and physical process occurred in the porous subsurface reservoir, ...
赵旭山 , 郝雷 , 蒋利军 , 米菁 , 杨海龄 ,
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 ...
A. Kumar , C. Kaur , S. S. Padhee ,
 PEC University of Technology, Chandigarh, India
 IIT Ropar, Punjab, India
This paper explores the complexities of a dragonfly's flapping wing motion. It includes the literature as well as analytical results using simulations done in COMSOL Multiphysics® software. The study depicts the Fluid-Structure Interaction of the 2D wing (airfoil) with air, governed by Naiver-Stokes equations. The wing follows mathematical functions and is given motion similar to dragonfly's ...