Hot oil is to be cooled in a double- tube counter- flow heat exchanger. The copper inner tubes have a diameter of 2 cm and negligible thickness. The inner diameter of the outer tube (the shell) is 3 cm. Water flows through the tube at a rate of 0.5 kg/ s, and the oil through the shell at a rate of 0.8 kg/ s. Taking the average temperatures of the water and the oll to be 45°C and 80°C, respectively, determine the overall heat transfer coefficient of this heat exchanger. Use the Table 1 if needed. The properties of water at 45 °C are as follows: Pr = 3.91 m2/s Kinematic viscosity, v= 0.602 x 10-6 p= 990.1 kg/m3 The properties of oil at 80 °C are as follows: Kinematic viscosity, v- 3.794 x 10-5 k = 0.637 W/m.K Pr = 499.3 m2/s k = 0.138 W/m.K Table 1: p= 852 kg/m3 Nusselt Number for fully developed laminar flow in a circular annulus with one surface insulated and the other isothermal Di/Do Nu Nu. 0.00 0.00 3.66 0.05 17.46 4.06 0.10 11.56 4.11 0.25 7.37 4.23 0.50 5.74 4.43 1.00 4.86 4.56
Hot oil is to be cooled in a double- tube counter- flow heat exchanger. The copper inner tubes have a diameter of 2 cm and negligible thickness. The inner diameter of the outer tube (the shell) is 3 cm. Water flows through the tube at a rate of 0.5 kg/ s, and the oil through the shell at a rate of 0.8 kg/ s. Taking the average temperatures of the water and the oll to be 45°C and 80°C, respectively, determine the overall heat transfer coefficient of this heat exchanger. Use the Table 1 if needed. The properties of water at 45 °C are as follows: Pr = 3.91 m2/s Kinematic viscosity, v= 0.602 x 10-6 p= 990.1 kg/m3 The properties of oil at 80 °C are as follows: Kinematic viscosity, v- 3.794 x 10-5 k = 0.637 W/m.K Pr = 499.3 m2/s k = 0.138 W/m.K Table 1: p= 852 kg/m3 Nusselt Number for fully developed laminar flow in a circular annulus with one surface insulated and the other isothermal Di/Do Nu Nu. 0.00 0.00 3.66 0.05 17.46 4.06 0.10 11.56 4.11 0.25 7.37 4.23 0.50 5.74 4.43 1.00 4.86 4.56
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Hot oil is to be cooled in a double- tube counter- flow heat exchanger. The copper inner tubes have a diameter of 2 cm and negligible thickness. The inner diameter of the outer tube (the shell) is 3 cm. Water
flows through the tube at a rate of 0.5 kg/ s, and the oil through the shell at a rate of 0.8 kg/ s. Taking the average temperatures of the water and the oll to be 45°C and 80°C, respectively, determine the overall
heat transfer coefficient of this heat exchanger.
Use the Table 1 if needed. The properties of water at 45
°C are as follows:
Pr = 3.91
m2/s
Kinematic viscosity, v = 0.602 x 10-6
p= 990.1 kg/m3
The properties of oil at 80 °C are as follows:
Kinematic viscosity, v = 3.794 x 10-5
k = 0.637 W/m.K
Pr = 499.3
m2/s
k = 0.138 W/m.K
Table 1:
p= 852 kg/m3
Nusselt Number for fully developed laminar flow in a
circular annulus with one surface insulated and the
other isothermal
Di/Do
Nu
Nu.
0.00
0.00
3.66
0.05
17.46
4.06
0.10
11.56
4.11
0.25
7.37
4.23
0.50
5.74
4.43
1.00
4.86
4.56
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