Author

Ganesh Sharma

Document Type

Thesis

College

College of Engineering

Department

Mechanical Engineering

Degree

MSE in Mechanical Engineering

Date Completed

2020

First Committee Member

Benner, Jingru

Second Committee Member

Santamaria, Anthony

Third Committee Member

Shin, Moochul

Additional Committee Member(s)

Dini, Said; Cheraghi, Hossein

Abstract

"Piezoelectric fans are considered a more efficient solution for thermal management purposes with the recent development of small and compact electronics. Traditional axial fans are difficult to scale down and much less efficient when downsized. Particle Image Velocimetry (PIV) analysis is utilized in this thesis to investigate vortex for- mation around the trailing edge of a vibrating piezoelectric fan driven at varying power input range from 30V to 120V . The interference between pair of counter-rotating vortices and their impacts on velocity magnitude is also investigated. Vortex formation and detachment is found to occur at an accelerated rate with an increase in Reynold’s number. The direction of the vor- tex pair trajectory is greatly affected by Reynold’s number of the flow. The circulation around vortices reaches its maximum quicker with an increase in power input. IB2d, an immersed boundary method software, is explored for numerical analysis of the flow across the piezoelectric fan. Time-dependent Lagrangian and Eulerian mesh are constructed for each time step using fiber model, allowing immersed boundaries to solve the fully coupled fluid-structure interaction problem. When compared, a vast discrepancy is found between the magnitudes of vortices calculated from experimental PIV and Immersed Boundary numerical simulation results."

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