Thermal processes of miniature thermomagnetic generators in resonant self-actuation mode

iScience

Hiroyuki Miki¹  Joel Joseph²  Manfred Kohl²  Makoto Ohtsuka³ 

[1] Faculty of Science and Engineering, Ishinomaki Senshu University, Ishinomaki 980-8580, Japan;Institute of Microstructure Technology, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsruhe, Germany;Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan;

关键词: Thermal design;    Thermal engineering;    Thermal property;    Thermomagnetic;    Energy harvesting;    Heusler alloys;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: This paper presents an investigation of the heat transfer processes in miniature thermomagnetic generators (TMGs) that are based on the recently developed concept of resonant self-actuation of a cantilever enabling efficient conversion of thermal into electrical energy. A lumped element model (LEM) is introduced to describe the dynamics of heat intake during mechanical contact between a thermomagnetic (TM) film and heat source, and of heat dissipation. The key parameters governing heat intake and dissipation are the heat transfer coefficient at contact and the thermal resistance Rb of the bonding layer between TM film and cantilever, respectively. The effects of these parameters on the performance metrics are investigated for different heat source temperatures above the Curie temperature of the TM film. LEM simulations reveal critical values of κ and Rb, above which stable performance of energy generation occurs characterized by large stroke and frequency resulting in large power.

【 授权许可】

Unknown