Journal of Engineering Thermophysics ( IF 2.4 ) Pub Date : 2021-06-18 , DOI: 10.1134/s1810232821010057 A. L. Gurashkin , A. A. Starostin , P. V. Skripov
Abstract
Miniature fiber optic sensors were used for detection of initial boiling-up of uniformly superheated liquid in the capillary of a bubble chamber. The possibility of local boiling-up activation by a laser pulse at a single-mode fiber end with a diameter of 9 \(\mu\)m was shown. The object of the study was \(n\)-pentane superheated at 82 K with respect to the liquid-vapor equilibrium temperature at atmospheric pressure. The control sensor recorded a signal similar to that of spontaneous macroscopic boiling-up. The activation threshold value for the radiation intensity at the end of the fiber was found. This value varies for different fibers. The minimum pulse energy required for activation was 6 nJ, which was insufficient for triggering of the thermal activation mechanism. An assumption is made about the mechanical effect of laser pulse on the fiber-liquid interface.
中文翻译:
自发沸腾开始:激光脉冲的激活效应
摘要
微型光纤传感器用于检测气泡室毛细管中均匀过热液体的初始沸腾。显示了在直径为 9 \(\mu\) m的单模光纤端通过激光脉冲激活局部沸腾的可能性 。研究对象是\(n\)-戊烷相对于大气压下的液-气平衡温度在 82 K 时过热。控制传感器记录了类似于自发宏观沸腾的信号。找到了光纤末端辐射强度的激活阈值。该值因不同的光纤而异。激活所需的最小脉冲能量为 6 nJ,不足以触发热激活机制。假设激光脉冲对纤维-液体界面的机械效应。