they werent concerned with jet back pressure there conditions were flow rate for a fixed heat transfer. They were concerned with angle of attack of the nozzle and nozzle shape as well. The idea is that the best heat transfer occurs in the center of the jet so using many jets increases the amount of high cooling areas as shown by how g1-.> g7. This increased cooling ability means you need less mass flow per watt disipated.
I'm goign to read more, but this is turning into another fun litrature review.
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