Cross flow shell and tube heat exchanger

This is a simple example of a shell and tube heat exchanger.  Air at 2000C flows in from the bottom across the outside of the tubes.  Air at 25C flows through the tubes coming in from the left side.

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The tubes of the shell and tube heat exchanger is shown.
Shown above are the fluid flow elements. The blue vertical path represents the 2000C air. The green arrows represent the 25C air flowing through the tubes. Convection elements connect the 25C flow paths to the inside of the tubes. Convection elements from the outside of tubes define heat transfer to the 2000C air.
Shown are the tube temperatures. As is expected, the hotter temperatures are at the end, the right side, of the bottom tubes.
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