Ching Eric J, Avedisian C Thomas, Cavicchi Richard C, Chung Do Hyun, Rah Jeff, Carrier Michael J
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA.
Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Int J Heat Mass Transf. 2016 Oct;101:707-718. doi: 10.1016/j.ijheatmasstransfer.2016.04.008. Epub 2016 Jun 7.
The bubble nucleation temperatures of several organic liquids (methanol, ethanol, butanol, n-heptane) on stress-minimized platinum (Pt) films supported by SiN membranes is examined by pulse-heating the membranes for times ranging from 1 µs to 10 µs. The results show that the nucleation temperatures increase as the heating rates of the Pt films increase. Measured nucleation temperatures approach predicted superheat limits for the smallest pulse times which correspond to heating rates over 10 K/s, while nucleation temperatures are significantly lower for the longest pulse times. The microheater membranes were found to be robust for millions of pulse cycles, which suggests their potential in applications for moving fluids on the microscale and for more fundamental studies of phase transitions of metastable liquids.
通过对氮化硅（SiN）膜支撑的应力最小化铂（Pt）膜进行1微秒至10微秒的脉冲加热，研究了几种有机液体（甲醇、乙醇、丁醇、正庚烷）在该膜上的气泡成核温度。结果表明，随着铂膜加热速率的增加，成核温度升高。对于对应加热速率超过10 K/s的最小脉冲时间，测得的成核温度接近预测的过热度极限，而对于最长脉冲时间，成核温度则显著更低。发现微加热器膜在数百万次脉冲循环中具有鲁棒性，这表明它们在微尺度上移动流体的应用以及对亚稳液体相变的更基础研究中具有潜力。
