Maurice Tutor

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Category > Management Posted 20 Jan 2018 My Price 9.00

inner and outer surfaces

A type-302 stainless steel tube of inner and outer diameters Di = 22 mm and Do = 27 mm, respectively, is used in a cross-flow heat exchanger. The fouling factors, R” ƒ, for the inner and outer surfaces are estimated to be 0.0004 and 0.0002 m2 ∙ K/W, respectively.

 

(a) Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal resistances due to convection, tube wall conduction, and fouling.

(b) Instead of air flowing over the tube, consider a situation for which the cross-flow fluid is water at 15°C with a velocity of Vo 1 m/s. Determine the overall heat transfer coefficient based on the outside area of the tube, Uo. Compare the thermal resistances due to convection, tube wall conduction, and fouling.

(c) For the water–air conditions of part (a) and mean velocities, um,i , of 0.2, 0.5, and 1.0 m/s, plot the overall heat transfer coefficient as a function of the cross-flow velocity for 5 ≤ Vo ≤ 30 m/s.

(d) For the water–water conditions of part (b) and cross-flow velocities, Vo, of 1, 3, and 8 m/s, plot the overall heat transfer coefficient as a function of the mean velocity for 0.5 ≤ um,i ≤ 2.5 m/s.

Answers

Maurice Tutor
(5)
Status NEW Posted 20 Jan 2018 11:01 PM My Price 9.00

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