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Influence of plate size on the evaporation rate of a heated droplet
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-8235-9639
AB Electrolux.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-1033-0244
2015 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 33, no 15-16, p. 1963-1970Article in journal (Refereed) Published
Abstract [en]

The purpose of this study is to numerically investigate how the width of a plate influences natural convection around a droplet. Droplets evaporating on hot surfaces has many applications including drying of dishes and paint. Evaporation rate and deposition of particles withheld in the fluid is of great importance in both cases. As a first step to investigate how the drying rate and deposition mechanisms can be controlled, this work aims to investigate how the external flow around a water droplet influences the evaporation rate. Natural convection caused by the hot plate on which the droplet rests is considered and the effect of different widths is examined. Results show that an extension of the plate past the droplet will increase the maximum velocity in the domain due to natural convection while the flow close to the surface is decreased due to the no slip condition and temperature gradient. A decrease of the evaporation rate is therefore observed when the plate is extended past the droplet as compared to the case when the plate and droplet have the same diameter. Simulations furthermore show that the results from the heat and mass transfer analogy only compare well to the results of Fick's law when the droplet and plate has the same width.

Place, publisher, year, edition, pages
2015. Vol. 33, no 15-16, p. 1963-1970
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-28316DOI: 10.1080/07373937.2015.1080722ISI: 000363064800017Scopus ID: 2-s2.0-84957580186Local ID: 214e64ea-90e5-4336-8d9c-09d00dbb4357OAI: oai:DiVA.org:ltu-28316DiVA, id: diva2:1001512
Conference
International Drying Symposium : 24/08/2014 - 27/08/2014
Note
Validerad; 2015; Nivå 1; 20150803 (stlu); Konferensartikel i tidskriftAvailable from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved

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Ljung, Anna-LenaLundström, Staffan

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