The effect of surface fog on the transmittance of light

It is shown theoretically that surface fog can reduce the transmittance of normally incident light through transparent materials from about 90% to nearly 50%. This result is also confirmed experimentally by reflectance measurements. The most important parameter is the contact angle which the droplet...

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Bibliographic Details
Published in:Solar energy 1991, Vol.46 (4), p.191-197
Main Authors: Briscoe, B.J., Galvin, K.P.
Format: Article
Language:English
Subjects:
140905
Applied sciences
BUILDINGS
CONTACT ANGLE
CORRELATIONS
DROPLETS
Energy
Exact sciences and technology
FORMULACIONES
FORMULATION
FORMULATIONS
GREENHOUSES
INVERNADEROS
LIGHT
LIGHT TRANSMISSION
LUMIERE
LUZ
MATERIALS
MEASUREMENT
MEDICION
MESURE
Miscellaneous
Natural energy
NATURAL LIGHT
OPTICAL PROPERTIES
PARTICLES
PHYSICAL PROPERTIES
PROPIEDADES OPTICAS
PROPRIETE OPTIQUE
RECOMMENDATIONS
REFLECTANCE
REFLECTIVITY
SERRE
SIZE
SOLAR ENERGY
SURFACE PROPERTIES
TRANSPARENT MATERIALS
VAPOR CONDENSATION
WETTABILITY
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Description
Summary:It is shown theoretically that surface fog can reduce the transmittance of normally incident light through transparent materials from about 90% to nearly 50%. This result is also confirmed experimentally by reflectance measurements. The most important parameter is the contact angle which the droplets make with the surface. For contact angles less than about 40°, there is almost no loss in transmission. For larger contact angles, there is a significant decrease in the transmittance, with the worst case occurring for a contact angle of 90°.
ISSN:0038-092X
1471-1257
DOI:10.1016/0038-092X(91)90063-3