Mark, Thanks, they mention 10 m/s or about 22 MPH lift, which is reasonable and about half of what I eyeballed from that waterspout, which disagrees with what Wilkipedia and Brittanica have published. They also mention it is slightly warmer in the center which makes sense to me. In order to vacuum condense water vapor you have to REMOVE heat from the water vapor (Heat of Vaporization). The interesting thing to me is that usually a gas increases in pressure when it is warmer and yet the center of the eye remains 1-10 mb LOWER pressure, just like a hurricane maintains a "warm eye" and yet the pressure is much lower than atmospheric pressure in the center
They do not really answer WHY in that article but I agree with their data and it still appears to me that a string of vacuum energy could explain what maintains the disturbance. The vacuum energy would extract entropy from the surrounding gas, triggering the condensing. Stewart On Tue, Jul 2, 2013 at 4:41 PM, Mark Gibbs <[email protected]> wrote: > On Tue, Jul 2, 2013 at 1:20 PM, ChemE Stewart <[email protected]> wrote: > > >> *Curious what others think about that water moving up in the spout as it >> crosses onto land. I don't think the humidity changes that much so I do not >> think it is due to a change in condensing (which would be vacuum condensing >> anyway) I know how much horsepower it takes to pump water that high and >> air can't do that...* >> > See > http://journals.ametsoc.org/doi/pdf/10.1175/1520-0493(1977)105%3C0725%3AWWTAPS%3E2.0.CO%3B2 > > [mg] >
