Techno Press


Computers and Concrete   Volume 22, Number 2, August 2018, pages 161-166
DOI: http://dx.doi.org/10.12989/cac.2018.22.2.161
 
Classical shell theory for instability analysis of concrete pipes conveying nanofluid
Reza Keikha, Ali Heidari, Hamidreza Hosseinabadi and Mohammad Salkhordeh Haghighi

 
Abstract     [Full Text]
    This paper deals with the instability analysis of concrete pipes conveying viscous fluid-nanoparticle mixture. The fluid is mixed by AL2O3 nanoparticles where the effective material properties of fluid are obtained by mixture rule. The applied force by the internal fluid is calculated by Navier-Stokes equation. The structure is simulated by classical cylindrical shell theory and using energy method and Hamilton\'s principle, the motion equations are derived. Based on Navier method, the critical fluid velocity of the structure is calculated and the effects of different parameters such as fluid velocity, volume percent of nanoparticle in fluid and geometrical parameters of the pipe are considered. The results present that with increasing the volume percent of nanoparticle in fluid, the critical fluid velocity increase.
 
Key Words
    critical fluid velocity; concrete pipes classical shell theory; nanofluid; exact solution
 
Address
Reza Keikha, Ali Heidari, Hamidreza Hosseinabadi and Mohammad Salkhordeh Haghighi: Department of Civil Engineering, Faculty of Engineering, University of Zabol, P.B. 9861335-856, Zabol, Iran
 

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