Prediction of evaporation time and rate of water sprays from their local drop-diameter distributions and liquid volume concentration

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Author list: Yongyingsakthavorn P., Vallikul P., Dumouchel C., Fungtammasan B., Tuntivoranukul K.

Publisher: Begell House Inc.

Publication year: 2011

Volume number: 21

Issue number: 2

Start page: 159

End page: 165

Number of pages: 7

ISSN: 1044-5110

eISSN: 1044-5110

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84920182026&doi=10.1615%2fAtomizSpr.2011001761&partnerID=40&md5=1e122fd456650cedb514536763ced6eb

Languages: English-Great Britain (EN-GB)

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Abstract

A method to determine time-dependent volume-based drop-diameter distribution of an evaporating group of drops heterogeneous in size and distributed over an entire cross section of a water spray is proposed in this paper. Using the fact that the number of drops does not change during evaporation while their size decreases following the D2 law, the timedependent volume-based drop-diameter distribution is expressed as a function of the initial drop-diameter distribution. This time-dependent distribution is found to depend on the local initial volume-based drop-diameter distribution as well as on the initial spatial liquid volume-fraction distribution. This model allows one to determine the timedependent evaporated mass ratio, the evaporation rate and the evaporation time of the groups of drops either confined in a local region or distributed over the entire spray cross section. As an illustration, it is applied on a real spray. Measurements were performed with a laser-diffraction technique and were analyzed to report local spray characteristics, i.e., local dropdiameter distribution and local liquid concentration. The local spray characteristics are transformed into a synthetic volume-based drop-diameter distribution that describes the spray over the entire cross section and that is used as the initial condition in the evaporation model. ฉ 2011 by Begell House, Inc.

Keywords

Drop-diameter distribution, Evaporation rate, Evaporation time, Liquid sprays, Liquid volume concentration