Transition boiling bubble powered micro-engine using a Leidenfrost bearing
Transition boiling bubble powered micro-engine using a Leidenfrost bearing
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DOI：
10.1016/j.applthermaleng.2023.120565
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发表时间：
2023-04
影响因子：
6.4
通讯作者：
P. Agrawal;A. Buchoux;G. Wells;R. Ledesma‐Aguilar;A. Walton;J. Terry;G. McHale;K. Sefiane;A. Stokes
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文献类型：
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作者：
P. Agrawal;A. Buchoux;G. Wells;R. Ledesma‐Aguilar;A. Walton;J. Terry;G. McHale;K. Sefiane;A. Stokes
在产生有效扭矩的同时克服摩擦是微型发动机面临的挑战。在这里，我们报告了一种微型发动机的发展，它利用过渡沸腾作为推进模式和莱顿弗罗斯特效应作为无摩擦轴承。与使用蒸汽携带作为推进机制的Leidenfrost发动机相比，过渡沸腾微型发动机的性能得到了显著改善（效率提高了3个数量级）。我们描述了过渡沸腾发动机的性能随温度的变化，并建立了一个解析模型来模拟和比较发动机的性能与实验观察结果。我们的研究结果提供了一种在微型发动机中使用几乎无摩擦轴承产生扭矩的新方法，解锁了遥感和低等级能量收集等应用。
Overcoming friction while generating useful torque is a challenge for micro engines. Here we report the development of a microscale engine that utilizes transition boiling as a mode of propulsion and the Leidenfrost effect as a friction-less bearing. The transition boiling micro engine shows significantly improved performance compared to a Leidenfrost engine, which uses vapor entrainment as a propulsion mechanism (up to 3 orders of magnitude higher efficiency). We characterize the performance of the transition boiling engine with temperature and develop an analytical model to model and compare the engine performance with experimental observations. Our results provide a new approach to generating torque with a virtually frictionless bearing in micro-engines unlocking applications in, e.g., remote sensing and low-grade energy harvesting.