Repeat Problem 40, using the same information except that the outside tube wall is insulated rather.

Repeat Problem 40, using the same information except that
the outside tube wall is insulated rather than maintained at constant
temperature.

Problem 40

A 3 m long annular fl ow area consists of a 1/2 standard
tube placed within a 1 standard tube, both type M and made of copper. Air fl
owing through the annulus receives heat from a vaporizing refrigerant in the
inner tube that keeps the outside diameter of the inner tube at 10°C. Th e
outer tube is submerged in ice, which begins melting and maintains the
inside-wall temperature of the outer tube at 0°C. A hydrodynamically developed
fl ow

Repeat Problem 40, using the same information except that
the outside tube wall is insulated rather than maintained at constant
temperature.

Problem 40

A 3 m long annular fl ow area consists of a 1/2 standard
tube placed within a 1 standard tube, both type M and made of copper. Air fl
owing through the annulus receives heat from a vaporizing refrigerant in the
inner tube that keeps the outside diameter of the inner tube at 10°C. Th e
outer tube is submerged in ice, which begins melting and maintains the
inside-wall temperature of the outer tube at 0°C. A hydrodynamically developed
fl ow of air at 125°C enters the annulus at a mass fl ow rate of 1 × 10–3 kg/s.
Determine the expected outlet temperature. Calculate also the friction factor
and pressure drop.

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