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Proceedings Paper

Oscillatory forced-convection-cooled compact SMA actuator
Author(s): Rajagopal S. Pachalla; Dimitris C. Lagoudas; Sharath S. Girimaji
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Paper Abstract

A reciprocating forced convection cooling concept for a high frequency hybrid shape memory alloy (SMA) actuator is introduced. The actuator combines resistive heating and reciprocating forced convection cooling. The main barrier to achieving high frequency actuation is the large cooling time of conventional steady unidirectional forced convection. Previous studies show that a reciprocating flow in a channel can be more effective in removing heat from the channel walls than the steady state unidirectional forced convection. Analysis of heat transfer from a SMA strip in steady unidirectional laminar forced convection and pulsating forced convection is undertaken in this study. A parametric study is conducted, with various values of parameters such as wall thickness to channel height ratio, Reynolds number, Prandtl number, fluid inlet temperature and oscillation frequency and amplitude of oscillation (in case of reciprocating flow), to identify the optimum operating conditions.

Paper Details

Date Published: 22 July 2003
PDF: 13 pages
Proc. SPIE 5055, Smart Structures and Materials 2003: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (22 July 2003); doi: 10.1117/12.483588
Show Author Affiliations
Rajagopal S. Pachalla, Texas A&M Univ. (United States)
Dimitris C. Lagoudas, Texas A&M Univ. (United States)
Sharath S. Girimaji, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 5055:
Smart Structures and Materials 2003: Smart Electronics, MEMS, BioMEMS, and Nanotechnology
Vijay K. Varadan; Laszlo B. Kish, Editor(s)

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