Character of sessile gold-water nanofluid droplet evaporation with solar heating on superhydrophobic surface

doi:10.11949/j.issn.0438-1157.20180818

Abstract

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

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

CLC Number:

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.

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.

Figures/Tables 8

Fig.1 Experimental setup

Fig.2 Characterization of gold nanoparticles and nanofluid

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

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

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

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

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

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

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