Why is the pressure drop of gases so small, while that of liquids is so large?
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Why is the pressure drop of gases so small, while that of liquids is so large? A blower can push gas far away with a pressure rise of just a few dozen KPa, while a pump often needs several dozen meters of head to transport liquid materials to distant and high locations
It is mainly the density; for example, using the head formula based on the reaction pressure difference, H = (p2 – p1) / ρg + (v2 – v1) / 2g + z2 – z1
As for density, a simple way is to see which is more tiring: carrying a bucket of water or a bucket of air for one kilometer, {:9007:}
It’s mainly a gravity issue; with the same power, the acceleration generated under different gravitational forces will definitely be different
It’s mainly density. The density of water is nearly 800 times greater than that of gases; under ideal conditions, 800 times more work is required to drive it ； Next is the environment. Both water pumps and blowers operate in the atmospheric environment; lifting water 100 meters requires a head of 100 meters, whereas air in a chimney can rise hundreds of meters without the need for a blower, driven by environmental factors ； Furthermore, viscosity, elasticity, and the like also have an impact on transportation, but the effect of relative density can basically be ignored. .
The pressure drop is related to the fluid density; under constant other conditions, the greater the fluid density, the greater the pressure drop.
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