Oil is flowing through a 45 mm inside diameter iron pipe (k=16 W/mK) at 1.2 m/s. The thickness of pipe is 8 mm. It is being heated by steam outside the pipe, and the steam-film coefficient may be taken as 12 kW/m2 oC. At a particular point along the pipe the oil is at 40 oC, its density is 880 kg/m3, its viscosity is 2.1 cP, its thermal conductivity is 0.135 W/moC and its specific heat is 2.17 J/g oC.a) What is the overall heat transfer coefficient at this point, based on the inside area of the pipe?b) If the steam temperature is 120oC, what is the heat transfer rate at this point, based on the outside area of the pipe?c) Calculate the inside and outside wall temperatures of pipe when the steam temperature is 120oC and bulk temperature of oil is 40o

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Oil is flowing through a 45 mm inside diameter iron pipe (k=16 W/mK) at 1.2 m/s. The thickness of pipe is 8 mm. It is being heated by steam outside the pipe, and the steam-film coefficient may be taken as 12 kW/m^{2 o}C. At a particular point along the pipe the oil is at 40 ^oC, its density is 880 kg/m³, its viscosity is 2.1 cP, its thermal conductivity is 0.135 W/m^oC and its specific heat is 2.17 J/g ^oC.

a) What is the overall heat transfer coefficient at this point, based on the inside area of the pipe?
b) If the steam temperature is 120^oC, what is the heat transfer rate at this point, based on the outside area of the pipe?
c) Calculate the inside and outside wall temperatures of pipe when the steam temperature is 120^oC and bulk temperature of oil is 40^o

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