Response of Viscous Damping of Dashpot Containing Hybrid Nanofluid

Hayder Abdul khaliq Ali; Mayyadah S. Abed; Adil Abed Nayeeif

Authors

Hayder Abdul khaliq Ali Department of Mechanical Engineering, Mustansiriyah University, Baghdad, Iraq
Mayyadah S. Abed Department of Materials Engineering, University of Technology, Iraq
Adil Abed Nayeeif Department of Mechanical Engineering, Mustansiriyah University, Baghdad, Iraq

Keywords:

Nano-fluid, MWCNTs, Free and Forced Vibration of Rigid-Body, logarithmic decrement

Abstract

This work aimed to enhance the viscous damping of the oil shock absorbers by adding (1,2,3,4,5) vol% of single-phasefumed silica or precipitated silica to the hydraulic oil. Hybridphases were also used (functionalized MWCNT and fumed silica) as 5 vol% as total volume fraction adding. Nanofluid was prepared by using Ultrasonic Probe Sonicator. The effect of different additive concentrations of nano structure to the pure hydraulic oil of dashpot (damper) was tested by the free damping vibration rigid body beam apparatus. The decayed in amplitude cycles are recorded by pen recorder at the free end of the rigid beam. Damping coefficients, maximum overshoot and settling time for both kinds of nanofluid was calculated. Comparative study was investigated among the damping coefficient responses respect with each other. The obtained results indicate that the energy dissipated by viscous damping friction was decreased at different concentrations of nanostructure (single-phase and hybrid) dispersed in oil of the apparatus dashpot. The single-phase of 5 vol% MWCNTs and 0% of silica (0S5C) exhibits significant enhancement in response specifications and steady-state (such as maximum overshoot and settling time) of the rigid beam body. Due to the different behavior during damping test, rheological properties were also investigated for the hybrid nanofluid to sense and explain the damping results.