Nah, it's all gross design evaluations, nothing calculated. Cathar did all the experimenting, to find the optimal solution, and the rest is history.
For straight water, this design is going to be extremely difficult to beat. All from a simple concept: double inpingement.
As I've stated, you could easily build 30 variations of this block, to find an optimal solution: hole spacing, hole diameter, jet diameter, jet distance, fluid density, thermal conductivity of the baseplate material and coolant, and jet velocity. Those are the variables.
I believe that Cathar may have used a home made simulator, but I don't know how useful it was here.
(BTW Cathar, how many variations did you have to build/try?)
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