超疏水表面太阳能加热金-水纳米流体液滴蒸发特性

doi:10.11949/j.issn.0438-1157.20180818

摘要/Abstract

摘要：

实验研究了超疏水表面上太阳能加热金纳米流体液滴蒸发特性。用高速摄像机和红外摄像机同步触发记录了2 μl不同浓度金纳米流体液滴在超疏水表面的蒸发过程。通过一系列实验，观察对比不同浓度金纳米流体液滴蒸发过程中体积、接触角、接触直径、液滴表面温度以及蒸发速率等动态特性。结合水蒸气扩散模型以及红外温度图分析液滴在超疏水表面上的蒸发过程中蒸发通量变化以及表面温度变化等特性。发现不同浓度纳米流体液滴蒸发速率基本一致；超疏水表面上液滴蒸发以常接触角模式为主，后期呈现混合模式蒸发；液滴蒸发过程中，液滴上半部分蒸发通量大，致使液滴表面温度较低。

关键词: 太阳能, 超疏水表面, 传质, 等离激元, 蒸发, 纳米流体

Abstract:

The evaporation characteristics of gold nanofluid by solar heated on superhydrophobic surfaces were investigated experimentally. The evaporation process of 2 μl gold nanofluid droplets on the superhydrophobic surface was recorded simultaneously by high-speed camera and IR camera. Through a series of experiments, the evaporation dynamic characteristics of volume, contact angle, contact diameter, droplet surface temperature and evaporation rate of gold nanofluid with different concentrations were studied. Combined with the water vapor diffusion model and the IR temperature distribution, the characteristics of evaporation flux and surface temperature change of droplets on the superhydrophobic surface were analyzed. It is found that the evaporation rates of nanofluid droplets with different concentrations are almost the same. The droplets evaporation on the super-hydrophobic surface is the normal contact angle mode, and the mixed evaporation mode occurs in the final stage. During the droplets evaporation process, the evaporation flux of the upper part of the droplets is large, resulting in the lower surface temperature.

Key words: solar energy, superhydrophobic surface, mass transfer, plasmonic, evaporation, nanofluid

中图分类号:

闫鑫, 徐进良. 超疏水表面太阳能加热金-水纳米流体液滴蒸发特性[J]. 化工学报, 2019, 70(3): 892-900.

Xin YAN, Jinliang XU. Character of sessile gold-water nanofluid droplet evaporation with solar heating on superhydrophobic surface[J]. CIESC Journal, 2019, 70(3): 892-900.

图/表 8

图1 实验系统图

Fig.1 Experimental setup

图2 金纳米颗粒与纳米流体表征

Fig.2 Characterization of gold nanoparticles and nanofluid

图3 超疏水表面太阳能加热纳米流体液滴蒸发图

Fig.3 Images of nanofluid droplets evaporation on super-hydrophobic surfaces with solar heating

图4 无量纲液滴体积随时间的变化曲线

Fig.4 Dimensionless volume of droplet versus time under solar heating

图5 无量纲液滴接触角随时间的变化曲线

Fig.5 Dimensionless contact angle of droplet versus time under solar heating

图6 无量纲液滴接触面直径随时间的变化曲线

Fig.6 Dimensionless contact area diameter of droplet versus time under solar heating

图7 超疏水表面太阳能加热纳米流体液滴蒸发红外温度分布

Fig.7 IR temperature images of nanofluid droplets on super-hydrophobic surfaces with solar heating

图8 不同浓度纳米流体液滴单位照射投影面积蒸发速率随时间的变化

Fig.8 Evaporation rate per projection area for different concentrations of nanofluid droplets versus time

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