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- W2069372110 abstract "Very large (48 m2) fog-water collectors are being used on the coastal mountains in northern Chile to generate water. The microphysical characteristics of the high elevation fog (camanchaca) have been examined and the collection efficiency of the collectors measured. The camanchaca exhibits characteristics of clouds, reflecting its source as a marine stratocumulus deck. Droplet mean volume diameters (MVD) in ten cases ranged from 10.8 to 15.3 μm. Droplet concentrations were typically 400 cm−3 with fog liquid water contents ranging from 0.22 to 0.73 g m−3. The large fog-water collectors consist of a double layer of mesh made from a 1-mm wide flat polypropylene ribbon. The theoretical collection efficiencies of a 1-mm wide ribbon, for droplets with the observed MVD, at wind speeds from 2 to 8 m s−1, are 75 to 95%. The field measurements of the collection efficiency of the mesh at the centerline of a large collector gave values of ∼66% (3.5–6.5 m s−1; 11 μm MVD). This is in good agreement with the theoretical value for a single ribbon once the areal coverage of the mesh is taken into account. At lower windspeeds, the measured collection efficiencies dropped to ∼26% (1.9 m s−1; 15 μm MVD). A simple parameterization of the mesh collection efficiency allowed some properties of meshes to be examined, e.g. the mesh shows a marked decrease in droplet collection as the ribbon width increased while maintaining a constant percentage areal coverage. The measured water output from the large collector was 2.9 times lower than predicted using the measured amount of water removed at the centerline and the wind speed 6m upstream. This implies a large-collector efficiency of only ∼20%. This low value may result from a lowering of wind speed as the fog approaches the mesh, a reduced collection efficiency away from the centerline, and water losses in the system. Dans les montagnes côtières du nord du Chili, on se sert, pour obteinir de l'eau, d'immenses capteurs d'eau de brouillard (48 m2). On a examiné les caractéristiques microphysiques du brouillard de forte altitude (camanchaca) et mesuré l'efficacité de captage. Le camanchaca présente des caractéristiques de nuages, en reflétant la source sous forme de plate-forme de stratocumulus marin. Dans dix cas, le diamètre de la masse moyenne (DMM) des gouttelettes s'est situé entre 10,8 et 15,3 μm. La concentration type des gouttelettes était de 400/cm3, la teneur en eau du brouillard allant de 0,22 à 0,73 g/m3. Les grands capteurs d'eau de brouillard consistent en une double couche de filet enrruban plat de polypropylène de 1 mm de large. La capacité théorique de captage d'un ruban de 1 mm de large, pour des gouttelettes du DMM observé, par un vent soufflant de 2 à 8 m/s est de 75 à 95%. Sur le terrain, les mesures de la capacité de captage du filet à la ligne médiane d'un grand capteur out donné des valeurs d'environ 66% (3,5 à 6,5 m/s; DMM de 11 μm). Une fois qu'on tient compete de la couverture surfacique du filet, ce chiffre correspond bien à la valeur théorique afférente à un seul ruban. A des vitesses plus basses du vent, la capacité mesurée de captage est tombée à environ 26% (1,9 m/s, DMM de 15 μm). Le simple établissement des paramétres de la capacité de captage du filet a permis d'examiner certaines propriétés du filet. Par exemple, le filet recueille beaucoup moins de gouttelettes quand la largeur du ruban s'accroît, la couverture surfacique en pourcentage étant constante. La production mesurée d'eau du grand capteur a été 2,9 fois plus basse que la production prévue d'après la quantité mesurée d'eau enlevée à la ligne médiane et à la vitesse du vent à 6 m n amont. Le grand capteur aurair donc une capacité de captage de seulement 20% environ. Cette basse valeur résulte peut-être de la baisse de la vitesse du vent quand le brouillard s'approche du filet, d'une baisse de la capacité de captage quand on s'éloigne de la ligne médiane, et des pertes d'eau de l'installation." @default.
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- W2069372110 date "1989-12-01" @default.
- W2069372110 modified "2023-10-15" @default.
- W2069372110 title "The collection efficiency of a massive fog collector" @default.
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- W2069372110 doi "https://doi.org/10.1016/0169-8095(89)90036-7" @default.
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