8. A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wall of the said pipe has a temperature of 8 deg Celsius. Density of liquid water= 1000 kg/m' Cp water=4.210 J/kgK Viscosity of liquid water= 1.5674 x10° Pa.s thermal conductivity of lead = 35 W/mK Find: а. Overall heat coefficient (U) based on outside surface area b. System's heat transfer rate c. Prandtl (Pr), Reynolds (Re) numbers and type of flow

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C
flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the
pipe at 20 deg C. The inside wvall of the said pipe has a temperature of 8 deg Celsius.
Density of liquid water= 1000 kg/m'
Cp water=4.210 J/kgK
Viscosity of liquid water= 1.5674 x10° Pa.s
thermal conductivity of lead = 35 W/mK
Find:
Overall heat coefficient (U) based on outside surface area
b. System's heat transfer rate
Prandtl (Pr), Reynolds (Re) numbers and type of flow
а.
с.
Transcribed Image Text:A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wvall of the said pipe has a temperature of 8 deg Celsius. Density of liquid water= 1000 kg/m' Cp water=4.210 J/kgK Viscosity of liquid water= 1.5674 x10° Pa.s thermal conductivity of lead = 35 W/mK Find: Overall heat coefficient (U) based on outside surface area b. System's heat transfer rate Prandtl (Pr), Reynolds (Re) numbers and type of flow а. с.
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