When I first read the book Compact Heat Exchangers by Kays and London
I missed this reference. My problem was the non standard nomenclature.
Kays & London refer to an inlet diffuser as a "header".
Here is a reference from the book that looks very interesting indeed.

"Oblique Flow Headers for Heat Exchangers". Trans. ASME, vol 90, p.271
1968 London, Klopfer & Wolf.

I will try to get down to the UCLA library next week and look this 
paper up and make a copy.
 
Paul Lamar
 
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