Fluid-structure interaction of microtubes conveying fluid accounting for thermal effect
In this study, the fluid-structure interaction (FSI) properties of microtubes conveying micro-flow in temperature field are investigated. The governing equation of the system is established based on the linear thermoelastic theory and then solved by using the complex mode method. The natural frequency and critical flow velocity for buckling instability are obtained and the influences of temperature variation, micro size effect and tube thickness on the vibration characteristics are discussed. The results obtained show that increasing temperatures decreases the natural frequency and critical flow velocity; size effects of the microtube and micro-flow can increase and decrease the critical flow velocity, respectively, however that effect of micro-flow declines and even disappears with increasing temperatures; variation of tube thickness greatly affects the natural frequency at small thicknesses (the outer diameter near the characteristic length of micro-structures), however temperature variation has dominant effect on the natural frequency at large thicknesses.
School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
Abstract：In this study, the fluid-structure interaction (FSI) properties of microtubes conveying micro-flow in temperature field are investigated. The governing equation of the system is established based on the linear thermoelastic theory and then solved by using the complex mode method. The natural frequency and critical flow velocity for buckling instability are obtained and the influences of temperature variation, micro size effect and tube thickness on the vibration characteristics are discussed. The results obtained show that increasing temperatures decreases the natural frequency and critical flow velocity; size effects of the microtube and micro-flow can increase and decrease the critical flow velocity, respectively, however that effect of micro-flow declines and even disappears with increasing temperatures; variation of tube thickness greatly affects the natural frequency at small thicknesses (the outer diameter near the characteristic length of micro-structures), however temperature variation has dominant effect on the natural frequency at large thicknesses.
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