Nozzle issue
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I have a question: does negative pressure form at the center of the nozzle during its operation? If so, how is it formed, and what is the principle behind it? Thank you
Nozzles are divided into atmospheric-pressure nozzles and pressure-rated nozzles. In the case of a pressure-driven nozzle, no negative pressure will be generated at the center of the nozzle during operation. In the case of a pressure-operated nozzle, negative pressure is also unlikely to be generated at its center. Since molten urea generally contains trace amounts of ammonia, it will flash out from the nozzle during operation as pressure drops; it is estimated that a slight positive pressure should prevail.
If there is negative pressure at the center of the nozzle, will the material ejected still spread in a conical shape?
Did the original poster come up with this idea based on the working principles of centrifugal pumps? ? If a negative pressure can be generated, then can we do without the melting pump? Hehe, the original poster’s suggestion is really good; those who understand this topic could please explain it! !
The poster’s suggestion is good; there should be positive pressure inside the nozzle, as it’s different from a centrifugal pump – the nozzle isn’t sealed and has many openings through which air can leak out: lol :lol. So it’s unlikely that negative pressure will be generated by centrifugal force. But when the nozzle speed and a certain load ensure that each tiny aperture is filled with liquid, is there a slight negative pressure at the center? It’s still debatable!