A new model to predict the influence of surface temperature on contact angle

Abstract The measurement of the equilibrium contact angle (ECA) of a weakly evaporating sessile drop becomes very challenging when the temperatures are higher than ambient temperature. Since the ECA is a critical input parameter for numerical simulations of diabatic processes, it is relevant to know...

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Autores principales:	Fabio Villa, Marco Marengo, Joël De Coninck
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/afb8427fe2f14addacf1362115c40286
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id	oai:doaj.org-article:afb8427fe2f14addacf1362115c40286
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spelling	oai:doaj.org-article:afb8427fe2f14addacf1362115c402862021-12-02T15:08:39ZA new model to predict the influence of surface temperature on contact angle10.1038/s41598-018-24828-82045-2322https://doaj.org/article/afb8427fe2f14addacf1362115c402862018-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-24828-8https://doaj.org/toc/2045-2322Abstract The measurement of the equilibrium contact angle (ECA) of a weakly evaporating sessile drop becomes very challenging when the temperatures are higher than ambient temperature. Since the ECA is a critical input parameter for numerical simulations of diabatic processes, it is relevant to know the variation of the ECA with the fluid and wall temperatures. Several research groups have studied the effect of temperature on ECA either experimentally, with direct measures, or numerically, using molecular dynamic simulations. However, there is some disagreement between the authors. In this paper two possible theoretical models are presented, describing how the ECA varies with the surface temperature. These two models (called Decreasing Trend Model and Unsymmetrical Trend Model, respectively) are compared with experimental measurements. Within the experimental errors, the equilibrium contact angle shows a decrease with increasing surface temperatures on the hydrophilic surface. Conversely the ECA appears approximately constant on hydrophobic surfaces for increasing wall temperatures. The two conclusions for practical applications for weakly evaporating conditions are that (i) the higher the ECA, the smaller is the effect of the surface temperature, (ii) a good evaluation of the decrease of the ECA with the surface temperature can be obtained by the proposed DTM approach.Fabio VillaMarco MarengoJoël De ConinckNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-10 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fabio Villa Marco Marengo Joël De Coninck A new model to predict the influence of surface temperature on contact angle
description	Abstract The measurement of the equilibrium contact angle (ECA) of a weakly evaporating sessile drop becomes very challenging when the temperatures are higher than ambient temperature. Since the ECA is a critical input parameter for numerical simulations of diabatic processes, it is relevant to know the variation of the ECA with the fluid and wall temperatures. Several research groups have studied the effect of temperature on ECA either experimentally, with direct measures, or numerically, using molecular dynamic simulations. However, there is some disagreement between the authors. In this paper two possible theoretical models are presented, describing how the ECA varies with the surface temperature. These two models (called Decreasing Trend Model and Unsymmetrical Trend Model, respectively) are compared with experimental measurements. Within the experimental errors, the equilibrium contact angle shows a decrease with increasing surface temperatures on the hydrophilic surface. Conversely the ECA appears approximately constant on hydrophobic surfaces for increasing wall temperatures. The two conclusions for practical applications for weakly evaporating conditions are that (i) the higher the ECA, the smaller is the effect of the surface temperature, (ii) a good evaluation of the decrease of the ECA with the surface temperature can be obtained by the proposed DTM approach.
format	article
author	Fabio Villa Marco Marengo Joël De Coninck
author_facet	Fabio Villa Marco Marengo Joël De Coninck
author_sort	Fabio Villa
title	A new model to predict the influence of surface temperature on contact angle
title_short	A new model to predict the influence of surface temperature on contact angle
title_full	A new model to predict the influence of surface temperature on contact angle
title_fullStr	A new model to predict the influence of surface temperature on contact angle
title_full_unstemmed	A new model to predict the influence of surface temperature on contact angle
title_sort	new model to predict the influence of surface temperature on contact angle
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/afb8427fe2f14addacf1362115c40286
work_keys_str_mv	AT fabiovilla anewmodeltopredicttheinfluenceofsurfacetemperatureoncontactangle AT marcomarengo anewmodeltopredicttheinfluenceofsurfacetemperatureoncontactangle AT joeldeconinck anewmodeltopredicttheinfluenceofsurfacetemperatureoncontactangle AT fabiovilla newmodeltopredicttheinfluenceofsurfacetemperatureoncontactangle AT marcomarengo newmodeltopredicttheinfluenceofsurfacetemperatureoncontactangle AT joeldeconinck newmodeltopredicttheinfluenceofsurfacetemperatureoncontactangle
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A new model to predict the influence of surface temperature on contact angle

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