The book Compact Heat Exchangers Kays & London (frequently quoted
by Fred Moreno) uses the term "header" in place of "diffuser". Apparently
there is no nomenclature standardization on this subject.
Here is a pertinent page from Kays & London.

Could you also send along the referenced figure 2-42b through d? That will
compare 3 diffuser shapes.

Thanks,
David

 
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