Sitter J S, Snyder T J, Chung J N, Marston P L
School of Mechanical and Materials Engineering, Washington State University, Pullman 99164-2920, USA.
J Acoust Soc Am. 1998 Nov;104(5):2561-9. doi: 10.1121/1.423910.
Pool boiling experiments from a platinum wire heater in FC-72 liquid were conducted under terrestrial and microgravity conditions, both with and without the presence of a high-intensity acoustic standing wave within the fluid. The purpose of this research was to study the interaction between an acoustic field and a pool boiling system in normal gravity and microgravity. The absence of buoyancy in microgravity complicates the process of boiling. The acoustic force on a vapor bubble generated from a heated wire in a standing wave was shown to be able to play the role of buoyancy in microgravity. The microgravity environment was achieved with 0.6 and 2.1-s drop towers. The sound was transmitted through the fluid medium by means of a half wavelength sonic transducer driven at 10.18 kHz. At high enough acoustic pressure amplitudes cavitation and streaming began playing an important role in vapor bubble dynamics and heat transfer. Several different fixed heat fluxes were chosen for the microgravity experiment and the effects of acoustics on the surface temperature of the heater were recorded and the vapor bubble movement was filmed. Video images of the pool boiling processes and heat transfer data are presented.
在地面和微重力条件下，对铂丝加热器在FC - 72液体中的池沸腾实验进行了研究，实验中流体内部有无高强度驻波。本研究的目的是研究声场与正常重力和微重力下的池沸腾系统之间的相互作用。微重力环境中浮力的缺失使沸腾过程变得复杂。实验表明，驻波中加热丝产生的蒸汽泡上的声力在微重力环境下能够起到浮力的作用。利用0.6秒和2.1秒的落塔实现了微重力环境。声音通过一个以10.18千赫兹驱动的半波长声换能器在流体介质中传播。在足够高的声压振幅下，空化和流动开始在蒸汽泡动力学和热传递中发挥重要作用。微重力实验选择了几种不同的固定热流密度，并记录了声学对加热器表面温度的影响，同时拍摄了蒸汽泡的运动情况。文中给出了池沸腾过程的视频图像和热传递数据。
