Hsu Chin-Chi, Cheng Shih-Hsien, Ko Yu-Feng, Tsou Z-Hao, Zhang Zhao-Chen, Su Chung-Jen, Chen Hong-Wei
Department of Mechanical Engineering, <a href="https://ror.org/04twccc71">National United University</a>, No. 2, Lienda, Miaoli 36063, Taiwan.
Phys Rev E. 2024 Jul;110(1):L012802. doi: 10.1103/PhysRevE.110.L012802.
A steel ball with a density higher than that of water can bounce on a water surface when heated to a temperature well above the Leidenfrost point. In this letter, an experiment is conducted where heated steel balls are released onto a water surface. The heated steel ball descends into the liquid, thus causing the liquid to evaporate and form a vapor cushion with an upward force that lifts the steel ball. Subsequently, the steel ball bounces off the water surface, like a solid ball bouncing off an elastic surface without sinking into the water. This phenomenon is known as the inverse Leidenfrost effect. In this letter, we evaluate the various motion behaviors of spheres at different Reynolds numbers and temperatures. Additionally, we analyze the bouncing behavior of solid spheres on a free liquid surface and examine the various force components.
密度高于水的钢球在加热到远高于莱顿弗罗斯特温度点时能在水面上弹跳。在这封信中，进行了一项实验，将加热后的钢球释放到水面上。加热后的钢球下降到液体中，从而使液体蒸发并形成一个具有向上力的蒸汽垫，该力将钢球抬起。随后，钢球从水面反弹，就像一个实心球从弹性表面反弹而不会沉入水中一样。这种现象被称为逆莱顿弗罗斯特效应。在这封信中，我们评估了球体在不同雷诺数和温度下的各种运动行为。此外，我们分析了固体球体在自由液体表面上的弹跳行为，并研究了各种力的分量。
