A new method to study evaporation of sessile drop from permeable surfaces

Shrikanth, V and Archana, S and Bobji, MS (2019) A new method to study evaporation of sessile drop from permeable surfaces. In: MEASUREMENT SCIENCE AND TECHNOLOGY, 30 (7).

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Abstract

Real time monitoring of the mass of an evaporating liquid drop from a real surface by optical methods cannot account for the volume of the drop that gets trapped between asperities. Mass measurement methods do not have high resolution, necessary to account for the small volume of the drop trapped in the pores. This work uses a non resonant mass sensor with a goniometer to simultaneously measure the mass and contact angle of the evaporating drop. Evaporative flux is used as the quantity of comparison across all surfaces. For a pinned sessile drop, the evaporative flux remains almost a constant for any kind of surface. For inkjet printing paper, the negative slope of the flux rate means evaporation is dominant. The drop breaches the hydrophobic coating on the paper to indicate a positive slope of this flux rate. In short, evaporation is strictly controlled by relative humidity and not the nature of the substrate.

Item Type:	Journal Article
Publication:	MEASUREMENT SCIENCE AND TECHNOLOGY
Publisher:	IOP PUBLISHING LTD
Additional Information:	copyright for this article belongs to IOP PUBLISHING LTD
Keywords:	evaporation; non resonant mass sensor; evaporative flux; inkjet printing paper; spreading
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	25 Jul 2019 11:42
Last Modified:	25 Jul 2019 11:42
URI:	http://eprints.iisc.ac.in/id/eprint/62856

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