Experimental study on effect of support fiber on fuel droplet vaporization at high temperatures
Experimental study on effect of support fiber on fuel droplet vaporization at high temperatures
复制标题
支撑纤维对高温燃料液滴汽化影响的实验研究
DOI：
10.1016/j.fuel.2020.117407
复制
发表时间：
2020-05
期刊：
影响因子：
7.4
通讯作者：
Sun Chunhua
中科院分区：
文献类型：
--
作者：
Wang Jigang;Huang Xiaoyu;Qiao Xinqi;Ju Dehao;Sun Chunhua
采用高速背光成像技术，在停滞高温环境（673-973 K）下实验研究了支撑纤维对燃料液滴蒸发的影响。将初始直径几乎相同的液滴悬浮在不同的支撑纤维上，从而消除了由于初始液滴直径不同而导致的支撑纤维对液滴蒸发的影响。纤维直径分别为0.08、0.1和0.15 mm，热导率分别为1.4、80和400 W/m·K。同时，通过理论分析对实验结果进行了验证。结果表明，液滴蒸发速率常数与纤维直径平方和导热系数呈线性关系，这与文献结果一致。液滴寿命与纤维直径和热导率呈线性关系。液滴蒸发速率常数随纤维导热系数的增大而增大，但液滴寿命却随纤维导热系数的增大而减小。首次证明了支撑纤维能够引起燃料液滴在高温下的微爆炸，但以往的研究未见报道。当纤维直径大于0.15 mm或导热系数大于400 W/m·K时，发生了纤维传热诱发的微爆炸。这是由支撑纤维引起的局部沸腾或液滴内部的莱顿弗罗斯特效应引起的。最佳选择是纤维直径小于0.1mm，导热系数小于80 W/m·K。
The effect of support fiber on fuel droplet vaporization is experimentally investigated in a stagnant high-temperature environment (673–973 K) using high-speed backlit imaging technique. Droplets with nearly identical initial diameter suspended on the different support fibers, thus the effect of support fiber on droplet vaporization due to different initial droplet diameter is removed. The fiber diameters are 0.08, 0.1 and 0.15 mm, and thermal conductivities are 1.4, 80 and 400 W/m·K, respectively. Meanwhile, the experimental results are verified by theoretical analysis. The results show that the droplet vaporization rate constant is linearly related to the squared diameter and thermal conductivity of fiber, which is consistent with the results in the literature. Moreover, the droplet lifetime changes linearly with fiber diameter and thermal conductivity. An increase in the droplet vaporization rate constant with thermal conductivity of fiber, but, a decrease for droplet lifetime. It is proved for the first time that support fiber can cause fuel droplet micro-explosion at high temperatures, however, the previous studies have not been reported. When the fiber diameter is greater than 0.15 mm or the thermal conductivity is higher than 400 W/m·K, the fiber heat transfer induced micro-explosion occurred. This is caused by support fiber induced local boiling or Leidenfrost effect inside the droplet. The optimum choice is that the fiber diameter is less than 0.1 mm and thermal conductivity is less than 80 W/m·K.
登录
查看更多内容
DOI：
10.1080/00022470.1967.10469003
发表时间：
1967-07
期刊：
Journal of the Air Pollution Control Association
影响因子：
--
作者：
Robison Ja;Brehob Wm
通讯作者：
Robison Ja;Brehob Wm
影响因子：
9
作者：
M. S. Wu;S. I. Yang
通讯作者：
M. S. Wu;S. I. Yang
影响因子：
7.4
作者：
Kesheng Meng;Wei Fu;Y. Lei;Dongmei Zhao;Qizhao Lin;Gaofeng Wang
通讯作者：
Kesheng Meng;Wei Fu;Y. Lei;Dongmei Zhao;Qizhao Lin;Gaofeng Wang
影响因子：
1.9
作者：
Ghassemi, H;Baek, SW;Khan, QS
通讯作者：
Khan, QS
影响因子：
3.4
作者：
Rasid, Ahmad Fuad Abdul;Zhang, Yang
通讯作者：
Zhang, Yang