Document Type
Article
Publication Date
4-9-2021
Department
Department of Mechanical Engineering-Engineering Mechanics
Abstract
The present study aims to measure the solid–liquid interface temperature of an evaporating droplet on a heated surface using a thermoresponsive polymer. Poly(N-isopropylacrylamide) (pNIPAM) was used owing to its sensitive optical and mechanical properties to the temperature. We also measured the refractive index variation of the pNIPAM solution by using the surface plasmon resonance imaging (SPRi). In particular, the present study proposed a new method to measure the solid–liquid interface temperature using the correlation among reflectance, refractive index, and temperature. It was found that the reflectance of a pNIPAM solution decreased after the droplet deposition. The solid–liquid interface temperature, estimated from the reflectance, showed a lower value at the center of the droplet, and it gradually increased along the radial direction. The lowest temperature at the contact line region is present because of the maximum evaporative cooling. Moreover, the solid–liquid interface temperature deviation increased with the surface temperature, which means solid–liquid interface temperature should be considered at high temperature to predict the evaporation flux of the droplet accurately.
Publication Title
Applied Sciences (Switzerland)
Recommended Citation
Lee, H.,
Jeong, C.,
Kim, D.,
Choi, C.,
&
Lee, S.
(2021).
Solid–liquid interface temperature measurement of evaporating droplet using thermoresponsive polymer aqueous solution.
Applied Sciences (Switzerland),
11(8).
http://doi.org/10.3390/app11083379
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/14800
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Version
Publisher's PDF
Publisher's Statement
Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Publisher’s version of record: https://doi.org/10.3390/app11083379