Question

An oil having density 850 kg/m³, specific heat 1.8 kJ/kg°C and thermal conductivity 0.15 W/m°C enters at a temperature 70°C and velocity 3 m/s in a pipe of diameter 1.5 cm. If the surface temperature of pipe is maintained at 40°C, then the pipe length required to cool the oil to 48°C is [Assurne flow to be laminar and fully developed] a. 587.11 m b. 540.35 m c. 622.29 m d. 681.95 m

          An oil having density 850 kg/m³, specific heat 1.8 kJ/kg°C and thermal conductivity 0.15 W/m°C enters at a temperature 70°C and velocity 3 m/s in a pipe of diameter
1.5 cm. If the surface temperature of pipe is maintained at 40°C, then the pipe length required to cool the oil to 48°C is
[Assurne flow to be laminar and fully developed]
a. 587.11 m
b. 540.35 m
c. 622.29 m
d. 681.95 m

An oil having density 850 kg/m³, specific heat 1.8 kJ/kg°C and thermal conductivity 0.15 W/m°C enters at a temperature 70°C and velocity 3 m/s in a pipe of diameter
1.5 cm. If the surface temperature of pipe is maintained at 40°C, then the pipe length required to cool the oil to 48°C is
[Assurne flow to be laminar and fully developed]
a. 587.11 m
b. 540.35 m
c. 622.29 m
d. 681.95 m

Added by Derrick G.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Adi S

11/01/2023

Step 1

The Reynolds number (Re) is given by: Re = (density * velocity * diameter) / dynamic viscosity First, we need to calculate the dynamic viscosity of the oil using the kinematic viscosity. The kinematic viscosity (ν) can be calculated using the formula: ν = dynamic Show more…

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An oil having density 850 kg/m^3, specific heat 1.8 kJ/(kg°C), and thermal conductivity 0.15 W/(m°C) enters at a temperature of 70°C and velocity of 3 m/s in a pipe of diameter 1.5 cm. If the surface temperature of the pipe is maintained at 40°C, then the pipe length required to cool the oil to 48°C is: a. 587.11m b. 540.35m c. 622.29m d. 681.95m