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RISS 인기검색어
- 검색키워드
- 저자 : Mohammadreza Azimi (검색결과 4 건)
- 무료
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MHD copper-water nanofluid flow and heat transfer through convergent-divergent channel
Mohammadreza Azimi,Rouzbeh Riazi 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.10
This work is focused on the analytical solution of a nanofluid consisting of pure water with copper nanoparticle steady flow through convergent-divergent channel. The velocity and temperature distributions are determined by a novel method called Reconstruction of variational iteration method (RVIM). The effects of angle of the channel, Reynolds and Hartmann numbers on the nanofluid flow are then investigated. The influences of solid volume fraction and Eckert number upon the temperature distribution are discussed. Based on the achieved results, Nusselt number enhances with increment of solid volume fraction of nanoparticles, Reynolds and Eckert numbers. Also the fourth order Runge-Kutta method, which is one of the most relevant numerical techniques, is used to investigate the validity and accuracy of RVIM and good agreement is observed between the solutions obtained from RVIM and some known numerical results.
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Using Acoustic Liner for Fan Noise Reduction in Modern Turbofan Engines
Azimi, Mohammadreza,Ommi, Fathollah,Alashti, Naghmeh Jamshidi The Korean Society for Aeronautical and Space Scie 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1
With the increase in global air travel, aircraft noise has become a major public issue. In modern aircraft engines, only a small proportion of the air that passes through the whole engine actually goes through the core of the engine, the rest passes around it down the bypass duct. A successful method of reducing noise further, even in ultra-high bypass ratio engines, is to absorb the sound created within the engine. Acoustically absorbent material or acoustic liners have desirable acoustic attenuation properties and thus are commonly used to reduce noise in jet engines. The liners typically are placed upstream and downstream of the rotors (fans) to absorb sound before it propagates out of the inlet and exhaust ducts. Noise attenuation can be dramatically improved by increasing the area over which a noise reducing material is applied and by placing the material closer to the noise source. In this paper we will briefly discuss acoustic liner applications in modern turbofan engines.
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Using Acoustic Liner for Fan Noise Reduction in Modern Turbofan Engines
Mohammadreza Azimi,Fathollah Ommi,Naghmeh Jamshidi Alashti 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1
With the increase in global air travel, aircraft noise has become a major public issue. In modern aircraft engines, only a small proportion of the air that passes through the whole engine actually goes through the core of the engine, the rest passes around it down the bypass duct. A successful method of reducing noise further, even in ultra-high bypass ratio engines, is to absorb the sound created within the engine. Acoustically absorbent material or acoustic liners have desirable acoustic attenuation properties and thus are commonly used to reduce noise in jet engines. The liners typically are placed upstream and downstream of the rotors (fans) to absorb sound before it propagates out of the inlet and exhaust ducts. Noise attenuation can be dramatically improved by increasing the area over which a noise reducing material is applied and by placing the material closer to the noise source. In this paper we will briefly discuss acoustic liner applications in modern turbofan engines.
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Hamidreza Azimi,Davoud Jahani,Sogand Aghamohammadi,Mohammadreza Nofar 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.8
Bubble nucleation and growth was experimentally and numerically investigated in polyvinyl alcohol (PVA)while using supercritical carbon dioxide (scCO2) as a blowing agent. The solubility and diffusivity of CO2 in PVA werefirst evaluated using a magnetic suspension balance (MSB). Bubble nucleation and growth during foaming was thenexamined using a batch foaming setup equipped with a visualization system. It was observed that the increase indepressurization rate during the foaming increased the average bubble density. The average bubble size during thefoaming was also evaluated through three different numerical models based on the integral method. Moreover, accordingto the bubble pressure profile, the PVA viscosity and CO2 diffusion control the bubble growth. According to thesensitivity analysis, the bubble growth seems to be more affected by the changes of thermodynamic parameters thanthe PVA rheological properties. Eventually, the average CO2 concentration and the critical free energy were numericallycalculated using the classic nucleation theory.
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