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Asian Journal of Scientific Research

Year: 2013 | Volume: 6 | Issue: 4 | Page No.: 691-702
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Authors

M.S. Bhuyan

B.Y. Majlis

M. Othman

Sawal H. Md Ali

C. Kalaivani

Shabiul Islam

Keywords

Dependency on battery as the only power source is putting an enormous burden in many applications due to size, weight, safety and lifetime constraints etc. Emerging applications like wireless sensor networks, implantable medical devices, heating ventilation and air conditioning system for indoor and automotive environmental comfort are examples of such class. In addition, it is often impractical to operate these systems using battery owing to the difficulty in replacing battery. Therefore, the ability to harvest ambient energy is vital for battery less operation. In this study, novel modeling of a micro energy harvester aimed at harvesting energy from fluid-flow induced vibration, through piezoceramic cantilever means is presented. The strategy pursued in order to harvest energy in low fluid-flow conditions, couples vortex shedding from a D-shaped bluff-body to a piezoelectric cantilever attached to the bluff-body. Fluidic pressure impulse on piezoelectric cantilever beam due to vortex shedding results in lift force. Fluctuation of fluidic pressure causes flexible cantilever to vibrate in the direction normal to fluid flow. Deformation of the piezoceramic cantilever converts mechanical energy into electrical energy through its crystalline structure. COMSOL-multiphysics simulations and results are presented in details to demonstrate the feasibility of the harvester in low fluid-flow velocities conditions ranging 1-5 m sec-1. In a (200x150x150) μm3 rectangular duct, at 5 m sec-1 fluid velocity, the (50x40x2) μm3 piezoelectric cantilever experienced concluding statement concluding statement 3088 Pa stress. The resulting cantilever deflection produced 2.9 mv, which is sufficient to drive an ultra-low-power rectifier circuit. This harvester is designed as a useful power source to replace or supplement batteries.
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