Posted by Jerry/MT on June 19, 2011 at 17:27:44 from (206.183.116.129):
In Reply to: Way OT - Contrails posted by farmer boy on June 19, 2011 at 07:48:14:
I would imagine the wind is the biggest factor in dissipating (or not dissipating) a contrail since it"s really cold and dry at the altitudes that commercial airplanes fly at (~33K to 45K feet). The contrail is just condensation from the water vapor is the exhaust gasses.
The relative velocity between the air and the exhaust gas will affect how quick the exhaust gases mix with the much drier surrounding air. So a plane flying with a tail wind (usually east bound)will have a higher velocity difference between the exhaust gas velocity and the air speed and will mix faster than one with a headwind(flying westbound).
The SR-71(Blackbird) used a special fluid that was injected into the exhaust gasses on it"s engines to prevent formation of a contrail. Some very complex chemistry in that application. Of course it flew a lot higher altitudes then commercial airplanes and it certainly did not want to have it"s posiion noted with a contrail even though it was virtually untouchable by any SAM that the Soviets had.
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