Spray cooling
Spray cooling
(OP)
I have tried to do a search on these forums and have found nothing, but it may be i am using the wrong keyword, if that is the case please direct me to the correct thread.
That said I am looking for equations for calculating the length of time it takes for sprayed droplets to evaporate into a hot vapour stream. if anybody could point me in the right direction i would be gratefull. I expected Perry's to have something, but unless I am looking in the wrong sections I cant find anything.
Thanks in advance
That said I am looking for equations for calculating the length of time it takes for sprayed droplets to evaporate into a hot vapour stream. if anybody could point me in the right direction i would be gratefull. I expected Perry's to have something, but unless I am looking in the wrong sections I cant find anything.
Thanks in advance





RE: Spray cooling
RE: Spray cooling
As an example the terminal velocity for the intermediate Re values, 2<Re<500, would be:
Vt=[0.072D1.6*(RhoL-Rhogas)/(visc0.6*Rhogas0.4)]0.714
Vt, m/s; RhoL and Rhogas, densities, kg/m3; visc, viscosity of the gas, Ns/m2
After doing an estimate of the terminal velocity, one re-estimates the value of Re=Vt* RhoL*D/visc
to verify whether the applied formula is the correct one for the pre-selected flowing regime.
Please comment.
RE: Spray cooling
I think i either need some way to calculate the evaporation rate of the droplets, or some reaction kenetics for this one depending on which is the governing factor.