Harvesting biomechanical energy in the walking by shoe based on liquid metal magnetohydrodynamics

作     者：Dan DAI Jing LIU Yixin ZHOU 

作者机构：Key Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBejing 100190China Department of Biomedical EngineeringSchool of MedicineTsinghua UniversityBeijing 100084China 

出 版 物：《Frontiers in Energy》 (能源前沿（英文版）)

年 卷 期：2012年第6卷第2期

页      面：112-121页

核心收录：

学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0702[理学-物理学] 

基　　金：supported by the Technical Institute of Physics and Chemistry  the Chinese Academy of Sciences 

主　　题：human energy harvesting liquid metal wear-able magnetohydrodynamics generator parasitic power inshoe 

摘      要：A liquid metal magnetohydrodynamics generation system （LMMGS） was proposed and demonstrated in this paper for collecting parasitic power in shoe while walking. Unlike the conventional shoe-mounted human power harvesters that use solid coil and gear mechanism, the proposed system employs liquid metal （Ga62In25Sn13） as energy carrier, where no moving part is requested in magnetohydrodynamics generators （MHGs）. While walk- ing with the LMMGS, the foot alternately presses the two liquid metal pumps （LMPs） which are respectively placed in the front and rear of the sole. As a result, the liquid metal in the LMPs （LMP I and II） is extruded and flows through the MHGs （MHG I and II） in which electricity is produced. For a comparison, three types ofLMMGSs （LMMGS A, B and C） were built where all the parts are the same except for the LMPs. Furthermore, performances of these LMMGSs with different volume of injected liquid metal were tested respectively. Experimental results reveal that both the output voltage and power of the LMMGS increase with the volume of injected liquid metal and the size of the LMPs. In addition, a maximum output power of 80 mW is obtained by the LMMGS C with an efficiency of approximately 1.3%. Given its advantages of no side effect, light weight, small size and reliability, The LMMGS is well-suited for powering the wearable and implantable micro/nano device, such as wearable sensors, drug pumps and so on.