Subject: Re: [FlyRotary] Re: spray bars --------------Boundary-00=_MWBIWCW0000000000000 Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_MWBIRN00000000000000" --------------Boundary-00=_MWBIRN00000000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =0D Bill Eslick wrote:=0D > FWIW........... I installed a "mister" nozzle ahead of one of my =0D > evaporator cores. I have temperature sensors (cht probes) at the exit =0D > of each radiator, so I can read differences in delta T between the two.= =0D > =0D > I used a 30 psi pump from a motor home water system. On the hottest of = =0D > days (all summer in Texas), the most benefit I ever saw was 1 to 2 =0D > degrees. I'm sure this could be improved with more nozzles, better =0D > placement, etc., but I had much more success with modifying the cowl fl= ap.=0D =0D =0D Can you estimate how much water you were pumping into the plenum? =0D As I remember, it was probably only about a quart per takeoff.=0D =0D =46rom Ed's earlier postings on the amount of thermal energy needed to vaporize =0D a set amount of water, I would say the success or failure of a mister =0D would depend on how much water it pumped. The volume of water is what =0D removes the heat, the misting only makes it more efficient.=0D Right. I never really got any serious quantitative research done before going to the cowl flap. It is just another consumable that is better don= e without if possible.=0D =0D When you say, "the exit of each radiator", is that measuring the cooling = =0D temp or the exit air? I'm assuming the former, but I'm not sure.=0D Someday I plan to write clearly, but not yet. :-) The exit temp is the coolant temp. I just compare it to the "coolant temp" which is taken jus= t prior to the coolant heading for the radiators. Sorry.=0D =0D Veeduber --------------Boundary-00=_MWBIRN00000000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Bill Eslick wrote:
> FWIW........... I installed a "mist= er" nozzle ahead of one of my
> evaporator cores. I have temperatu= re sensors (cht probes) at the exit
> of each radiator, so I can r= ead differences in delta T between the two.
>
> I used a 30 = psi pump from a motor home water system. On the hottest of
> days = (all summer in Texas), the most benefit I ever saw was 1 to 2
> de= grees. I'm sure this could be improved with more nozzles, better
>= placement, etc., but I had much more success with modifying the cowl fla= p.

Can you estimate how much water you were pumping into the plenum= ?

As I remember, it was probably only about a qu= art per takeoff.

From Ed's earlier postings on the amount of thermal energy needed to= vaporize
a set amount of water, I would say the success or failure o= f a mister
would depend on how much water it pumped. The volume of wa= ter is what
removes the heat, the misting only makes it more efficien= t.

Right. I never really got any serious qu= antitative research done before going to the cowl flap. It is just = another consumable that is better done without if possible.
When you say, "the exit of each radiator", is that measuring the cooling=
temp or the exit air? I'm assuming the former, but I'm not sure.

Someday I plan to write clearly, but not yet. = :-) The exit temp is the coolant temp. I just compare it to t= he "coolant temp" which is taken just prior to the coolant heading for th= e radiators. Sorry.

Veeduber

______________________= ______________________________
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