• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Evaporation characteristics of ethanol droplets containing graphite nanoparticles under infrared radiation
【24h】

Evaporation characteristics of ethanol droplets containing graphite nanoparticles under infrared radiation

机译：含石墨纳米颗粒的乙醇液滴在红外辐射下的蒸发特性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The evaporation characteristics of liquid ethanol droplets containing graphite nanoparticles under infrared radiation were studied both experimentally and numerically. The experimental results show that the droplet evaporation rate is higher in the presence of a 2 mW infrared radiation field with a fixed wavelength of 2.3 μm than without radiation. The evaporation rate, however, decreases over time. Additionally, with particle addition, the evaporation rate no longer follows the classical D~2-law. The deviation is greater at higher particle concentrations. A model was developed to simulate the instantaneous evaporation rate, considering both effects of particle accumulation on the droplet surface and radiation energy absorption by the nanoparticles. In particular, a stochastic Monte Carlo method coupled with Mie theory and Beer-Lambert law of volumetric absorption was used to calculate the distribution of the absorbed radiation energy within the droplet, which was then used to compute the temperature profiles of the droplet. The modeling results show under infrared radiation, the evaporation rate of the nanofluid droplet increases as a function of particle concentration. This is due to rising droplet surface temperature through radiation absorption by the nanoparticles near the droplet surface. However, at the later stage of evaporation, as the particles start to accumulate on the droplet surface, the effective surface area for evaporation decreases and hence reduces the evaporation rate. These two competing mechanisms combine to control the instantaneous evaporation rate.
机译：实验和数值研究了含石墨纳米颗粒的乙醇液体液滴在红外辐射下的蒸发特性。实验结果表明，在固定波长为2.3μm的2 mW红外辐射场下，液滴的蒸发速率要比无辐射时高。然而，蒸发速率随时间降低。此外，添加颗粒后，蒸发速率不再遵循经典的D_2律。在较高的颗粒浓度下，偏差更大。考虑到颗粒在液滴表面的积聚和纳米颗粒吸收辐射能的影响，开发了一个模型来模拟瞬时蒸发速率。特别地，将随机蒙特卡罗方法与Mie理论和比尔-朗伯体积吸收定律相结合，用于计算液滴内吸收的辐射能量的分布，然后用于计算液滴的温度分布。模拟结果表明，在红外辐射下，纳米流体液滴的蒸发速率随颗粒浓度的增加而增加。这是由于通过液滴表面附近的纳米粒子的辐射吸收而使液滴表面温度上升的缘故。然而，在蒸发的后期，随着颗粒开始聚集在液滴表面上，用于蒸发的有效表面积减小，因此降低了蒸发速率。这两个相互竞争的机制共同控制了瞬时蒸发速率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号