I'm doing some comparative thermal flow sims of a few pneumatic extruded heat ex-changers submerged in water and I'm get some unusual temperatures.
Analysis type - External
External fluid - water (default), 2 deg C, 1.01 bar (atmos) pressure (with a 0.25 m/s flow in Y)
Internal fluid - air inlet; Environ pressure; -14 deg C, 10 bar
outlet; Static pressure; 2 deg C, 1.01 (atmos)
Material - Aluminium, 300 mm long
1st heat ex-changer with a hollow inner tube;
Analysis seems ok
2nd heat ex-changer analysis;
It's very warm in the center shaft, approx 10.5 deg C. Should it go over the ambient temperature of 2 deg C?