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I understand that by using jet impingement cooling, we can achieve a high convective heat transfer rate, but there is also a stagnation region where the kinetic energy of the jet will be converted to heat and so create a region of higher temperature. So does the Jet impingement 'cooling' always cool, OR is there a condition that it will only cool as long as the surface temperature is greater than the stagnation temperature of the jet?

GRANZER
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    There are always implicit conditions. For example you may not be able to cool something that is already very cold. – Abel May 29 '23 at 20:05
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    A properly designed cooler will cool. A 1000 kph air jet will probably make things get hot in certain conditions. Edge conditions exist. – Tiger Guy May 30 '23 at 19:28

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