How do atomizers work actually? I believe that there is big misconception about Bernoulli principle. I was curious about how liquid atomizers work and all those explanations just don't make sense for me. People say that its pressure reduction because of air acceleration. But the key point is pressure drop is a reason, not a result.
Pressure that built up in sphere right before point 1, drops to atmospheric pressure meanwhile air gains velocity at the exit of point 1. So there are no further pressure drops. The drop had already happened from some positive effective pressure to atm pressure when air traveled through point 1. So after that air travels with atm pressure and velocity V which was gained by excessive pressure in the spherical pump. That's it. So how liquid is being sucked up at point 3? What is the actual cause? Maybe it is something related to 'turbulence suck'?

 A: The Bernoulli equation contains the math, but it doesn't furnish much physical insight. Here is a simple way to think about this.
When the air zooming through the horizontal tube encounters the opening of the vertical tube coming up from the bottom, that moving air has a tendency to try and drag extra air along with it as it crosses the opening, and carry that air away. The faster the air is moving in the horizontal tube across the opening, the harder it pulls on the air in the vertical tube, urging it to join in.
If you can get the air in the horizontal tube moving fast enough, the suction it applies to the end of the vertical tube is great enough to pull fluid in the vertical tube upwards against gravity and it then mixes with the moving air, which carries it off as a spray of fine droplets.
A: Bernoulli is applicable to this case, unlike many situations where it’s incorrectly cited. For steady incompressible inviscid flow along a streamline, it just says that the total energy density is constant—where there’s more kinetic energy due to motion there’s less potential energy due to pressure and vice versa. To see that the pressure at the T intersection (your point 3) is low, ignore the bulb—you’re right that that introduces complication because the pressure there is higher than atmospheric by an unknown amount. Instead, consider a streamline running from the T to the exit. Imagine instead of just ending there, the tube flares out to a larger diameter (streamlines will be similar either way, but this makes it easier to visualize).  The pressure at the outlet of this larger tube is atmospheric.  Following the streamline back to the T, you see that the velocity is higher (same mass flux through a smaller cross section) so pressure is lower.
