scholarly journals Study on the Growth of Holes in Cold Spraying via Numerical Simulation and Experimental Methods

Coatings ◽  
2016 ◽  
Vol 7 (1) ◽  
pp. 2 ◽  
Author(s):  
Guosheng Huang ◽  
Hongren Wang ◽  
Xiangbo Li ◽  
Lukuo Xing
2012 ◽  
Vol 516-517 ◽  
pp. 917-920
Author(s):  
Xue Yao Wang ◽  
Xue Zhi Wu ◽  
Sheng Dian Wang ◽  
Xiang Xu ◽  
Yun Han Xiao

The flow character in riser is important for deep understanding the steady and high-efficient running of CFBs. In this paper, the 2D numerical simulation research for bench-scale circular cross-section riser based on EMMS methods is carried out. The solids’ transient moving profiles are captured. By analyzing the axial solids concentration profiles by simulation and experimental methods, the practicability of the EMMS model is verified.


2018 ◽  
Vol 180 ◽  
pp. 02093
Author(s):  
Smyk Emil ◽  
Mrozik Dariusz ◽  
Olszewski Łukasz ◽  
Peszyński Kazimierz

Determining of minor losses coefficient is very complicated problem. Analytical methods are often very difficult and experimental methods are very expensive and time-consuming. Consequently, the use of numerical methods seems to be a good solution, but there are no publications describing this issue. Therefore, the paper is describing the numerical method of determining the minor loss coefficient ξ on the example of elbows with circular cross-section.


2006 ◽  
Vol 15 (4) ◽  
pp. 559-562 ◽  
Author(s):  
Wen-Ya Li ◽  
Chang-Jiu Li ◽  
Hong-Tao Wang ◽  
Cheng-Xin Li ◽  
Hee-Seon Bang

2011 ◽  
Vol 21 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Wen-Ya Li ◽  
Shuo Yin ◽  
Xueping Guo ◽  
Hanlin Liao ◽  
Xiao-Fang Wang ◽  
...  

2013 ◽  
Vol 436 ◽  
pp. 127-136 ◽  
Author(s):  
Corina Bokor ◽  
Vlad Mureşan ◽  
Toderiţa Nemeş ◽  
Claudiu Isarie

In this paper the authors propose an approach for analogical modeling and numerical simulation of the phenomena of sintering, taking into account different cases depending on the type of energy used in the process of aggregation and the nature of the material powder, using a software which simulates the propagation and the control of the temperature. Many physical phenomena encountered in science and engineering can be described mathematically through partial differential equations (PDE) and ordinary differential equations (ODE) such as propagation phenomena, engineering applications, hydrotechnics, chemistry, pollution a.s.o. There may be situations when the exact establish of the analytical solutions becomes difficult or impossible for arbitrary shapes. In these cases the determination of some approximant solution through experimental methods, that have to verify with acceptable errors, the PDE expression specified to the studied phenomenon, is justified.


Author(s):  
Sydney M. Tekam ◽  
Marc Demoulin ◽  
Virginie Daru

The design and set-up of an oil strainer consist in calculating the pressure drop between the outlet and the inlet of the separator and predicting its efficiency (which is defined for each droplet diameter, as the ratio of oil droplets trapped in the strainer above oil droplets entering the strainer). The efficiency spectra of two separators are evaluated with a measurement bench and a comparison is made with numerical simulation. Efficiency is low –down to an average 3% in some cases. Therefore, it is hard to quantify the accuracy of the methods. Additional tests must be performed with a higher volume flow to increase average efficiency. Nevertheless, the accuracy and the relevance of the numerical method employed are far from prior expectation.


2014 ◽  
Vol 941-944 ◽  
pp. 2444-2448
Author(s):  
Yi Wen Yuan ◽  
Wei Pu Xu

This paper investigated the performance of ISO11439 standard I-Cylinder under fire condition via both numerical simulation and experimental methods, and proved the similarity between the two results. The paper also analyzed the material and the metallurgical structure of the invalid tested I-cylinder, indicating that fire would not lead to the material degradation and failure. The overall tests and comparisons led to the conclusion that I-cylinder explosion under fire condition is most likely caused by the material flaws or other safety defects of the cylinder, and not the fire. The cylinder manufacturing be suggested to regulate more strictly and properly.


2019 ◽  
Vol 130 ◽  
pp. 01037
Author(s):  
Willyanto Anggono ◽  
Akihiro Hayakawa ◽  
Ekenechukwu C. Okafor ◽  
Gabriel Jeremy Gotama

As a renewable and sustainable fuel made from digestion facility, biogas is composed predominantly of methane (CH4) and carbon dioxide (CO2). CO2 in biogas strongly affects its combustion characteristics. In order to develop efficient combustors for biogas, fundamental flame characteristics of biogas require extensive investigation. In understanding the influence of CO2 concentration and mixture pressure on biogas combustion, the effects of CO2 concentration on the laminar burning velocity of methane/air mixtures were studied at different pressures. The studies were conducted using both numerical and experimental methods. The experiment was conducted using a constant volume high pressure combustion chamber. The propagating flames were recorded with a high speed digital camera by employing Schlieren photography technique. The numerical simulation was carried by utilizing CHEMKIN-PRO with GRI-Mech 3.0 employed as the chemical kinetics model. The results show that the laminar burning velocity of methane-air mixtures decreased with an increase in CO2 concentration and mixture pressure. Therefore, the burning velocity of biogas mixtures may decrease as the amount of CO2 in the gas increases.


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