Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops

Alexandros Askounis, Yutaku Kita, Masamichi Kohno, Yasuyuki Takata, Vasileios Koutsos, Khellil Sefiane

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The effect of localized heating on the evaporation of pure sessile water drops was probed experimentally by a combination of infrared thermography and optical imaging. In particular, we studied the effect of three different heating powers and two different locations, directly below the center and edge of the drop. In all cases, four distinct stages were identified according to the emerging thermal patterns. In particular, depending on heating location, recirculating vortices emerge that either remain pinned or move azimuthally within the drop. Eventually, these vortices oscillate in different modes depending on heating location. Infrared data allowed extraction of temperature distribution on each drop surface. In turn, the flow velocity in each case was calculated and was found to be higher for edge heating, due to the one-directional nature of the heating. Additionally, calculation of the dimensionless Marangoni and Rayleigh numbers yielded the prevalence of Marangoni convection. Heating the water drops also affected the evaporation kinetics by promoting the "stick-slip" regime. Moreover, both the total number of depinning events and the pinning strength were found to be highly dependent on heating location. Lastly, we report a higher than predicted relationship between evaporation rate and heating temperature, due to the added influence of the recirculating flows on temperature distribution and hence evaporation flux.

Original languageEnglish
Pages (from-to)5666-5674
Number of pages9
JournalLangmuir
Volume33
Issue number23
DOIs
Publication statusPublished - Jun 13 2017

Fingerprint

Evaporation
evaporation
Heating
Kinetics
heating
Water
kinetics
water
Temperature distribution
Vortex flow
temperature distribution
vortices
Marangoni convection
Stick-slip
evaporation rate
Rayleigh number
Flow velocity
emerging
slip
flow velocity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops. / Askounis, Alexandros; Kita, Yutaku; Kohno, Masamichi; Takata, Yasuyuki; Koutsos, Vasileios; Sefiane, Khellil.

In: Langmuir, Vol. 33, No. 23, 13.06.2017, p. 5666-5674.

Research output: Contribution to journalArticle

Askounis, Alexandros ; Kita, Yutaku ; Kohno, Masamichi ; Takata, Yasuyuki ; Koutsos, Vasileios ; Sefiane, Khellil. / Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops. In: Langmuir. 2017 ; Vol. 33, No. 23. pp. 5666-5674.
@article{b6a2b83c1f5d42cb89be91d564ac341c,
title = "Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops",
abstract = "The effect of localized heating on the evaporation of pure sessile water drops was probed experimentally by a combination of infrared thermography and optical imaging. In particular, we studied the effect of three different heating powers and two different locations, directly below the center and edge of the drop. In all cases, four distinct stages were identified according to the emerging thermal patterns. In particular, depending on heating location, recirculating vortices emerge that either remain pinned or move azimuthally within the drop. Eventually, these vortices oscillate in different modes depending on heating location. Infrared data allowed extraction of temperature distribution on each drop surface. In turn, the flow velocity in each case was calculated and was found to be higher for edge heating, due to the one-directional nature of the heating. Additionally, calculation of the dimensionless Marangoni and Rayleigh numbers yielded the prevalence of Marangoni convection. Heating the water drops also affected the evaporation kinetics by promoting the {"}stick-slip{"} regime. Moreover, both the total number of depinning events and the pinning strength were found to be highly dependent on heating location. Lastly, we report a higher than predicted relationship between evaporation rate and heating temperature, due to the added influence of the recirculating flows on temperature distribution and hence evaporation flux.",
author = "Alexandros Askounis and Yutaku Kita and Masamichi Kohno and Yasuyuki Takata and Vasileios Koutsos and Khellil Sefiane",
year = "2017",
month = "6",
day = "13",
doi = "10.1021/acs.langmuir.7b00957",
language = "English",
volume = "33",
pages = "5666--5674",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "23",

}

TY - JOUR

T1 - Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops

AU - Askounis, Alexandros

AU - Kita, Yutaku

AU - Kohno, Masamichi

AU - Takata, Yasuyuki

AU - Koutsos, Vasileios

AU - Sefiane, Khellil

PY - 2017/6/13

Y1 - 2017/6/13

N2 - The effect of localized heating on the evaporation of pure sessile water drops was probed experimentally by a combination of infrared thermography and optical imaging. In particular, we studied the effect of three different heating powers and two different locations, directly below the center and edge of the drop. In all cases, four distinct stages were identified according to the emerging thermal patterns. In particular, depending on heating location, recirculating vortices emerge that either remain pinned or move azimuthally within the drop. Eventually, these vortices oscillate in different modes depending on heating location. Infrared data allowed extraction of temperature distribution on each drop surface. In turn, the flow velocity in each case was calculated and was found to be higher for edge heating, due to the one-directional nature of the heating. Additionally, calculation of the dimensionless Marangoni and Rayleigh numbers yielded the prevalence of Marangoni convection. Heating the water drops also affected the evaporation kinetics by promoting the "stick-slip" regime. Moreover, both the total number of depinning events and the pinning strength were found to be highly dependent on heating location. Lastly, we report a higher than predicted relationship between evaporation rate and heating temperature, due to the added influence of the recirculating flows on temperature distribution and hence evaporation flux.

AB - The effect of localized heating on the evaporation of pure sessile water drops was probed experimentally by a combination of infrared thermography and optical imaging. In particular, we studied the effect of three different heating powers and two different locations, directly below the center and edge of the drop. In all cases, four distinct stages were identified according to the emerging thermal patterns. In particular, depending on heating location, recirculating vortices emerge that either remain pinned or move azimuthally within the drop. Eventually, these vortices oscillate in different modes depending on heating location. Infrared data allowed extraction of temperature distribution on each drop surface. In turn, the flow velocity in each case was calculated and was found to be higher for edge heating, due to the one-directional nature of the heating. Additionally, calculation of the dimensionless Marangoni and Rayleigh numbers yielded the prevalence of Marangoni convection. Heating the water drops also affected the evaporation kinetics by promoting the "stick-slip" regime. Moreover, both the total number of depinning events and the pinning strength were found to be highly dependent on heating location. Lastly, we report a higher than predicted relationship between evaporation rate and heating temperature, due to the added influence of the recirculating flows on temperature distribution and hence evaporation flux.

UR - http://www.scopus.com/inward/record.url?scp=85020722604&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020722604&partnerID=8YFLogxK

U2 - 10.1021/acs.langmuir.7b00957

DO - 10.1021/acs.langmuir.7b00957

M3 - Article

AN - SCOPUS:85020722604

VL - 33

SP - 5666

EP - 5674

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 23

ER -