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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v8.i4.70
pages 471-478

EVAPORATION RATES OF AGRICULTURAL SPRAY MATERIAL AT LOW RELATIVE WIND SPEEDS

Milton E. Teske
Continuum Dynamics, Inc., Ewing, New Jersey, 08543, USA
Clarence G. Hermansky
E. I. du Pont de Nemours and Company, Wilmington, Delaware, USA
Christopher M. Riley
Research and Productivity Council, Fredericton, New Brunswick, Canada

ABSTRACT

The evaporation rates of several agricultural spray materials are investigated as relative wind speed (between the droplet and ambient air) approaches zero. Laboratory studies show that application of the classical approach to interpreting these results overestimates the evaporation rate λ by more than a factor of 2 in this speed regime, and call into question the functional forms of Sherwood number used previously to connect forced convection with free convection. In particular, a bounding curve may be developed as

λ/λ = 0.4 + 0.116 Re

for Reynolds numbers Re < 5.16 (λ is the evaporation rate at Re = 5.16 and higher). This result suggests that Sherwood number approaches 0.8 (rather than 2) as relative wind speed (and Re) approach zero. Implications of this finding, particularly in agricultural spraying and peripherally in spray applications of complex mixtures, are examined.


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