Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 10, Problem 10.5P
Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is
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Liquid water flows in a thin-walled circular tube at a mass flow rate of 11 g/s. The water enters the tube at 60°C, where it is heated at a rate of 3.8 kW. The tube is circular with a length of 2.5 m and an inner diameter of 25 mm. The tube surface is maintained at a constant temperature. At the tube exit, a hydrogenated nitrile rubber (HNBR) o-ring is attached to the tube’s outer surface. The maximum temperature permitted for the o-ring is 150°C. Is the HNBR o-ring suitable for this operation? The fluid properties at 100°C are cp = 4217 J/kg∙K, k = 0.679 W/m∙K, μ = 0.282 × 10−3 kg/m∙s, and Pr = 1.75. Is this a reasonable temperature at which to evaluate the fluid properties?
The surface temperature of the tube is?
Liquid water flows in a thin-walled circular tube at a mass flow rate of 11 g/s. The water enters the tube at 60°C, where it is heated at a
rate of 3.8 kW. The tube is circular with a length of 2.5 m and an inner diameter of 25 mm. The tube surface is maintained at a constant
temperature. At the tube exit, a hydrogenated nitrile rubber (HNBR) o-ring is attached to the tube's outer surface. The maximum
temperature permitted for the o-ring is 150°C. Is the HNBR o-ring suitable for this operation? The fluid properties at 100°C are cp= 4217
J/kg-K, k= 0.679 W/m-K, µ = 0.282 × 103 kg/m.s, and Pr = 1.75. Is this a reasonable temperature at which to evaluate the fluid
properties?
Liquid water enters a 10-m-long smooth rectangular tube with a 50 mm and b = 25 mm. The surface
temperature is kept constant, and water enters the tube at 20°C with a mass flow rate of 0.25 kg/s.
Determine the tube surface temperature necessary to heat the water to the desired outlet temperature
of 80°C Find the pumping power.
Chapter 10 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 10 -
10.1 In a heat exchanger, as shown in the...Ch. 10 - Prob. 10.2PCh. 10 -
10.3 A light oil flows through a copper tube of...Ch. 10 - Prob. 10.4PCh. 10 - Water flowing in a long, aluminum lube is to be...Ch. 10 - Mot water is used to heat air in a double-pipe...Ch. 10 - Prob. 10.7PCh. 10 -
10.8 The heat transfer coefficient of a copper...
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