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Ed,
Step 3 was just an assumption, but you are right. The
largest source of total pressure loss in the system is
the radiator, and if you change that you will
definitely change the mass flow rate through the
system. The total pressure loss will be more for the
smaller frontal area and thicker radiator, so the mass
flow rate should be less for that case. How much less
cannot be stated because it depends on all of the
geometric details from the inlet to the exit of the
duct.
Also, I just noticed that the friction and heat
transfer scaling that I mentioned in the last email is
at the top, right of page 9-3 in Hoerner. Thought I
would mention that since you quoted him.
Ron
--- Ed Anderson <eanderson@carolina.rr.com> wrote:
Hi Ron,
I understand your succinct and clearly spelled out
process, but I guess where I depart is at step 3.
My point is if you change the core, you have
changed both the mass flow and deltaT. You would not put a core 1/2 the
frontal area of the original thin core without changing at least the diffuser
cross section area not to mention the area after the core. So even if you
left the inlet the same size, I am confident there is no way you would get
the same mass flow as before, perhaps more, perhaps less, but not the same
because by changing the core we have changed the parameters of the system
and the flow through it.
I content that by selecting the characteristics of
the thick radiator you can influence both the flow and the delta T.
But, I will readily admit that being confident does
not necessarily equate to being correct - just confidently wrong {:>)
Ed
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