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Investigation of a flame holder geometry effect on flame structure in non-premixed combustion
S. A. Hashemi,N. Hajialigol,A. Fattahi,K. Mazaheri,R. Heydari 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.11
In this paper the effect of flame holder geometry on flame structure is studied. The obtained numerical results using realizable k-ε and β-PDF models show a good agreement with experimental data. The results show that increasing in flame holder length decreases flame length and increases flame temperature. Additionally, it is observed that flame lengths decrease by increasing in flame holder radius and increase for larger radii. Furthermore in various radii, the flame temperature is higher for smaller flame lengths. It was found that behavior of flame structure is mainly affected by the mass flow rate of hot gases that come near the reactant by the recirculation zone.
Evaluation of the parameters affecting the Schmidt rebound hammer reading using ANFIS method
Ali Toghroli,Ehsan Darvishmoghaddam,Yousef Zandi,Mahdi Parvan,Maryam Safa,Mu’azu Mohammed Abdullahi,Abbas Heydari,Karzan Wakil,Saad A.M. Gebreel,Majid Khorami 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.5
As a nondestructive testing method, the Schmidt rebound hammer is widely used for structural health monitoring. During application, a Schmidt hammer hits the surface of a concrete mass. According to the principle of rebound, concrete strength depends on the hardness of the concrete energy surface. Study aims to identify the main variables affecting the results of Schmidt rebound hammer reading and consequently the results of structural health monitoring of concrete structures using adaptive neuro-fuzzy inference system (ANFIS). The ANFIS process for variable selection was applied for this purpose. This procedure comprises some methods that determine a subsection of the entire set of detailed factors, which present analytical capability. ANFIS was applied to complete a flexible search. Afterward, this method was applied to conclude how the five main factors (namely, age, silica fume, fine aggregate, coarse aggregate, and water) used in designing concrete mixture influence the Schmidt rebound hammer reading and consequently the structural health monitoring accuracy. Results show that water is considered the most significant parameter of the Schmidt rebound hammer reading. The details of this study are discussed thoroughly.
Strengthening of bolted shear joints in industrialized ferrocement construction
M. Ismail,M. Shariati,A.S.M. Abdul Awal,C.E. Chiong,E. Sadeghipour Chahnasir,A. Porbar,A. Heydari,M. Khorami 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.28 No.6
This paper highlights results of some experimental work that deals with strengthening of bolted shear joints in thin-walled ferrocement structure where steel wires, bent into U-shape are considered as simple inserts around the bolt hole. The parameters investigated include the number of layers of wire mesh, edge distance of bolt hole, size and location of the inserts. Test results have shown that for small edge distance, failure occurred either in cleavage or shearing mode, and the strength of the joint increased with an increase in the edge distance. This continued up to an upper limit set by either tension or bearing failure. The experimental study further revealed that for a given edge distance the strength of a joint can significantly be enhanced by using U-inserts. The equations developed for predicting joint strength in ferrocement composites can also be modified to include the effects of the inserts with a good level of accuracy.
M. Heydari Nosrat Abadi,H. Hassanpour Darvishi,A.R. Zamani Nouri 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.24 No.5
In this paper, dynamic stress, strain and deflection analysis of concrete pipes conveying nanoparticles-water under the seismic load are studied. The pipe is buried in the soil which is modeled by spring and damper elements. The Navier-Stokes equation is used for obtaining the force induced by the fluid and the mixture rule is utilized for considering the effect of nanoparticles. Based on refined two variables shear deformation theory of shells, the pipe is simulated and the equations of motion are derived based on energy method. The Galerkin and Newmark methods are utilized for calculating the dynamic stress, strain and deflection of the concrete pipe. The influences of internal fluid, nanoparticles volume percent, soil medium and damping of it as well as length to diameter ratio of the pipe are shown on the dynamic stress, strain and displacement of the pipe. The results show that with enhancing the nanoparticles volume percent, the dynamic stress, strain and deflection decrease.
S. Sattari,A. Reyhani,M.R. Khanlari,M. Khabazian,H. Heydari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this study, fabrication of methane gas sensor using composites of multi-walled carbon nanotubes (MWCNT) and polyaniline (PANI) on glass and silicon substrates is reported. In this respect, 8 wt% of purified MWCNT by acid washing procedure, was combined with PANI by solution mixing method. The MWCNT–PANI composite was deposited on the surface of glass and Si substrates using spin coating technique. The methane gas sensing of composite films were evaluated by measuring the change of electrical resistance in the presence of methane gas at room temperature. It is observed that the MWCNT–PANI film on the Si substrate shows a higher sensitivity to methane gas in comparison to pure PANI on the glass substrate. The characterization of samples has also been investigated by Fourier transform infrared, transmission electron microscopy and scanning electron microscopy analyses.