Torsional refrigeration by twisted, coiled, and supercoiled fibers
Torsional refrigeration by twisted, coiled, and supercoiled fibers
复制标题
通过扭曲、卷曲和超卷曲纤维进行扭转制冷
DOI：
10.1126/science.aax6182
复制
发表时间：
2019-10-11
期刊：
影响因子：
56.9
通讯作者：
Baughman, Ray H.
中科院分区：
文献类型：
--
作者：
Wang, Run;Fang, Shaoli;Baughman, Ray H.
大型和小型制冷都需要更高效率、更低成本的制冷。在固体的拉伸或流体静力学压缩循环中利用熵变化的冰箱是家庭中蒸汽压缩冰箱的可能替代品。我们表明，高冷却的结果从扭曲的，卷曲的，或超卷曲的纤维，包括那些天然橡胶，镍钛合金，和聚乙烯钓鱼线的捻度变化。使用相反的扭曲和卷曲的手性产生超卷曲的天然橡胶纤维和卷曲的钓鱼线纤维，当拉伸时冷却。一种用于冷却流动水的基于扭转的装置提供了高的冷却能量和装置效率。力学计算描述了扭转增强冷却的轴向和弹簧指数依赖性及其在聚乙烯纤维相变中的起源。
Higher-efficiency, lower-cost refrigeration is needed for both large- and small-scale cooling. Refrigerators using entropy changes during cycles of stretching or hydrostatic compression of a solid are possible alternatives to the vapor-compression fridges found in homes. We show that high cooling results from twist changes for twisted, coiled, or supercoiled fibers, including those of natural rubber, nickel titanium, and polyethylene fishing line. Using opposite chiralities of twist and coiling produces supercoiled natural rubber fibers and coiled fishing line fibers that cool when stretched. A demonstrated twist-based device for cooling flowing water provides high cooling energy and device efficiency. Mechanical calculations describe the axial and spring-index dependencies of twist-enhanced cooling and its origin in a phase transformation for polyethylene fibers.