Question

how do the fog droplets get collected in the receptacle below​

Answer 1

Answer:

Fog collection refers to the collection of water from fog using large pieces of vertical mesh net to make the fog-droplets flow down towards a trough below, known as a fog fence, fog collector or fog net. Through condensation, atmospheric water vapour from the air condenses on cold surfaces into droplets of liquid water known as dew. The phenomenon is most observable on thin, flat, exposed objects including plant leaves and blades of grass. As the exposed surface cools by radiating its heat to the sky, atmospheric moisture condenses at a rate greater than that of which it can evaporate, resulting in the formation of water droplets.

"Atrapanieblas" or fog collection in Alto Patache, Atacama Desert, Chile.

Water condenses onto the array of parallel wires and collects at the bottom of the net. This requires no external energy and is facilitated naturally through temperature fluctuation, making it attractive for deployment in less developed areas. The term fog fence comes from its long rectangular shape that resemble a fence, but fog collectors are not confined to only this style of structure.[1] The efficiency of the fog collector is based on material of the net, the size of the holes and filament, and chemical coating. Efficient fog collectors can harvest up to 10% of the moisture in the air, and inefficient collectors yield 2% of moisture.[2] An ideal location is a high altitude arid area near cold offshore currents, where fog is common, and therefore, the fog collector can produce the highest yield.[1]