The Meredith_effect is off-topic.
Quote:
The duct must be travelling at a significant speed with respect to the air for the effect to occur.
[snip]
The air expands and decreases temperature as it passes along the duct, before emerging to join the external air flow. Thus, the three processes of an open Brayton cycle are achieved: compression, heat addition at constant pressure and expansion. The thrust obtainable depends upon the pressure ratio between the inside and outside of the duct and the temperature of the coolant.[1] The higher boiling point of ethylene glycol compared to water allows the air to attain a higher temperature increasing the specific thrust.
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