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Additional Reading
Simulação Fluidodinâmica de um Digestor Contínuo para Produção de Celulose.
I. Neitzel [1], R. Kreczkiuski [1],
[1] FATEB, Telemaco Borba, Paraná, Brasil
A obtenção de polpa celulósica antecede a produção de papel e envolve a separação das fibras da madeira mediante a utilização de energia mecânica, térmica, química ou a combinação desses processos. Esta operação é realizada em um reator, tubular, cilíndrico e vertical (tipicamente 6 m de diâmetro e 50 m de altura), denominado genericamente de digestor. A madeira é alimentada pelo topo na forma ...
Aluminization Process from Ionic Liquid in Operative Conditions: Validation and Perspective
A. Giaccherini [1], E. Berretti [2], S. Martinuzzi [1], S. Caporali [1],
[1] INSTM, Firenze, Italy
[2] Department of Chemistry, University of Florence, Firenze, Italy
This work is a first evaluation of the validity of the frozen rotor approximation for the simulation of a stirred beaker. The agreement is good, further analysis will be carried before using the model to optimize labscale setup dedicated to IL electrochemistry.
Optimization of Device Geometry of a Fully-Implantable Hearing Aid Microphone
A. Dwivedi [1], G. Khanna [1],
[1] National Institute of Technology Hamirpur, Himachal Pradesh, India
The hearing impairment is affecting more than 360 million people all over the world.In India alone, 63 million people suffer from the significant auditory loss. Conventional hearing aids suffer from reliability, practicality and social stigma concerns. The totally implantable devices provide freedom from the social and practical difficulties of using conventional hearing aids. The paper presents ...
基于 COMSOL 的 PVT 法 AlN 晶体生长仿真：温场对生长驱动力的影响研究
金雷 [1],
[1] 中国电子科技集团公司第四十六研究所，天津，中国
分别从软件模拟和晶体生长实验两方面对衬底表面的温度分布进行研究，进而达到控制 AlN 蒸气在衬底表面过饱和度的目的。理论上，结合异质形核理论（图1 (a)-(c)），采用 COMSOL Multiphysics® 模拟软件对坩埚结构的温度分布进行模拟仿真(图1(d))，模拟结果表明：复合型衬底可以显著地改变衬底表面的温度分布，进而改变衬底表面 AlN 气氛的过饱和度，实现对晶体生长驱动力[1]的控制；实验上，采用 PVT 法 AlN 晶体的生长实验验证了软件模拟结果。采用复合型衬底生长 AlN 晶体时，通过对衬底表面的温度分布调控，如图1 (c)-(g)所示，可有效地控制晶体生长驱动力，进而实现形核位置和形核数量的控制[2，3]，经过 6~10 h AlN 晶体生长后，可获得较大直径的 AlN 单晶。拉曼光谱和 XRD 双晶摇摆曲线测试[4]结果表明，晶体具有很好的结晶性能。
Effect of Manufacturing Defects in the Form of Internal Leakages on the Acoustic Performance of Mufflers
D. Neihguk[1], A. Prasad [1]
[1] Mahindra & Mahindra Ltd, Chengalpattu, Tamil Nadu, India
The presence of manufacturing defects in the form of incomplete welding and missing perforated holes leads to internal leakages in mufflers. This results into unintended acoustic impedance modifications as well as the Herschel-Quincke effect. The narrow region acoustics model of COMSOL Multiphysics® software is used to simulate the thermoviscous losses associated with the leakages. The ...
血管对肿瘤的光热疗法的影响
吴淑莲 [1], 李晖 [2], 李志芳 [2],
[1] 福建师范大学，福州，中国
[2] 福建师范大学，福州，中国
引言：激光诱导间质肿瘤热疗法是一种可使生物组织局部地方凝结坏死的肿瘤疾病治疗方法，目前已经用于肝、脑等各部位的肿瘤治疗[1-2]。为了更好地进行肿瘤疾病的治疗，需要实时地对组织的温度和热损伤进行监控，而检测技术很难实现对肿瘤治疗过程的实时监测，故数值计算成为研究光热疗法的有力工具[2-6]。本模型将生物组织光传输的物理场与热传输的物理场相耦合，考虑组织光热参数随温度变化的情况，研究了肿瘤周围含有大动脉的情况时组织的温度分布随时间的变化情况，研究结果对指导临床医学肿瘤治疗有重要意义。 COMSOL Multiphysics® 的软件使用： 几何模型：如图1所示，圆柱代表光源，圆形区域代表肝脏肿瘤，弯曲圆柱代表大血管，大正方体代表肝脏。 PDE 接口和生物传热接口，选择生物组织的热损伤。 结果： 如图2，图3所示，在加热过程中，开始时血管对温度分布几乎无影响，但是随着加热时间变长 ...
Multiphysics Simulations for the Design of a Superconducting Magnet for Proton Therapy
C. Calzolaio [1], H. Carolin [1], S. Stephane [1],
[1] Paul Scherrer Institut, Villigen, Switzerland
The use of proton therapy for cancer treatment shows a growing trend, since the radiation dose delivered to the target volume is maximized and the dose to the surrounding healthy tissues is minimized. To direct the proton beam from all directions to the tumor in the patient, the last part of the beam transport system is mounted on a gantry rotating 360° around the patient. This system consists ...
Meshing Challenges in Simulating the Induced Currents in Vacuum Phototriode
S. Zahid [1], P. R. Hobson [1],
[1] Brunel University London, London, United Kingdom
Vacuum phototriodes (VPT) have been used as photodetectors for many years in particle physics experiments. For example, they were used in the OPAL experiment at LEP and are currently used in the endcap Electromagnetic Calorimeter of the CMS experiment, at CERN’s Large Hadron Collider. Existing VPTs are fast, low-gain devices that are able to operate in strong magnetic fields at angles up to ...
Fatigue Analysis of an Aluminum Tricycle Frame
B. Chiné [1], A. Rodríguez [1], J. A. Ramírez [1],
[1] Costa Rica Institute of Technology, School of Materials Science and Engineering, Cartago, Costa Rica
As a sustainable urban transport system, the tricycle can represent an adaptive mobility vehicle used to transport people and bulk load. This transport system must guarantee the security of its end users, so experimental and modeling works are very useful tools in order to evaluate the mechanical performance of its frame. Finite-element analysis is usually used to fine-tune the geometry of a ...
Numerical simulation of spreading characteristics for nanofluids droplet impinging on the solid surface
Hai-long Liu [1], Xue-feng Shen [1], Rui Wang [1], Yu Cao [1],
[1] School of Energy and Power Engineering, Jiangsu University, Zhenjiang, China
The nanofluid is a class of fluids with high thermal conductivity and non-Newtonian flow behaviors. In this work, we present numerical simulations of spreading characteristics for nanofluids droplet impinging on the solid surface which is of great importance in a number of applications such as multiphase flows, corrosion of solid surface, thermal management, spray coating, ink-jet printing and ...