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Atomization and Sprays
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ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2011001761
pages 159-165

PREDICTION OF EVAPORATION TIME AND RATE OF WATER SPRAYS FROM THEIR LOCAL

Pisit Yongyingsakthavorn
Department of Mechanical and Aerospace Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, Thailand
Pumyos Vallikul
Department of Mechanical and Aerospace Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, Thailand; Center on Energy Technology and Environment, Office of the Commission on Higher Education, Ministry of Education, Thailand
Christophe Dumouchel
Université et INSA de Rouen France
Bundit Fungtammasan
Center on Energy Technology and Environment, Office of the Commission on Higher Education, Ministry of Education; The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Bangkok, Thailand
Kunlanit Tuntivoranukul
King Mongkut's University of Technology North Bangkok; Center on Energy Technology and Environment, Office of the Commission on Higher Education, Ministry of Education, Thailand

RÉSUMÉ

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 time-dependent 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 drop-diameter 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.


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