Hi All,

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.

Conditions:

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?