Liquid metals flow through a tube with constant surface temperature. The Reynolds number is 2700, and the Prandtl number is 0.04. What is the Nusselt number? 2. The equations to model turbulent liquid metal flow in tubes: Nup - 7.0+0.02constant surface temperature 20.20 Nup 6.3+0.0167Re,80o uniform heat flux] 20.21
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A long horizontal cylinder with diameter of d-60 mm and length of L-1 m is at 27°C and is placed ...
3. Consider a cylinder of 20 mm in diameter (D) and 100 mm in length (L)...
3. Consider a cylinder of 20 mm in diameter (D) and 100 mm in length (L) that is installed in a duct. Air moves in cross flow over the side surface of the cylinder at a temperature (To) and velocity (V) of 33.7 C and 30 m/s, respectively. If the average cylinder surface temperature (T) is maintained at 120°C, what is the required power generation of the cylinder? Note: (1) Air properties can be found from Table A.4 in the...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of 2 cm and a length of 20 m. The outer surface temperature of the cylinder is 100 °C. The average Nusselt number is 38. The speed of the air before it reaches the cylinder is 10 m/s. Moreover, the freestream temperature of the air before it gets dose to the cylinder are 20 oc. If needed. You may consider the following thermohysical properties of...
Please estimate the initial cooling rate from a cylindrical drink can, which is initially at 35...
Please estimate the initial cooling rate from a cylindrical drink can, which is initially at 35 C, in a refrigerator at 5 C, for two configurations: (a) the can is put vertically, (b) the can is put horizontally. Assuming that the diameter and height of the can are 6 cm and 12 cm, respectively. Neglect the possible heat transfer from end surfaces. (20%) Hint: You may use the Churchill and Chu's correlation to evaluate the heat transfer coefficient due to...
Consider a long horizontal cylindrical pipe of external diameter 10 mm that is losing heat by...
Consider a long horizontal cylindrical pipe of external diameter 10 mm that is losing heat by convection to still air at 0oC. If the external surface of the pipe has a uniform temperature of 80oC, determine the rate of convection heat transfer per unit length of the pipe. The following properties may be assumed for air: = 1.127 kg·m-3 , k = 0.02665 W·m-1 ·K -1 , = 1.702 x 10-5 m2 ·s-1 , Pr = 0.724.
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with T; = 20°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe, so that the fluid exits at 60°C. Assuming fully developed flow and taking the average fluid properties to be p = 992.1 kg/m2, k = 0.631 W/m-°C, Cp =...
This is for static air don't just copy from others', this is a different problem. 1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature...
This is for static air don't just copy from others', this is a
different problem.
1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is left to cool in a large room of static air at 300 K. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is 500 K, and 10] 15]...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity k = 240 w/m·K, density ρ = 2700 kg/m3, and specific heat cp-900 נ/kg-K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k240...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k240 W/m- K, density p 2700 kg/m, and specific heat c900 J/kg K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of 1000 W/m....
Please show claer solve for ( a,c,d,e ) of this qustion. mm, electrical resistance per unit...
Please show claer solve for ( a,c,d,e ) of this qustion.
mm, electrical resistance per unit length An electrical transmission line (diameter: D=5 r=0.002 Ω/m) carries an electric current (1-100 A), dissipating an electrical power per unit length inr. On a windy day, the line is subjected to air flow (air temperature: T. -10C, air velocity V 50 km/hr) T, 10°C V 50 km/hr T, =? 1 -100 A air elec electrical line We would like to determine the surface...
A nuclear fuel rod with diameter of D=40 mm and length L=1m, has properties of k=1...
A nuclear fuel rod with diameter of D=40 mm and length L=1m, has properties of k=1 W/ mK, c=1600J/kg.K, and p=400 kg/mº. (a)Heat is generated uniformly in the rod with q'"' = 2 x 10 W/m. The rod is first cooled in oil with constant temperature Tu= 400 K and average heat transfer coefficient h=50 W/m2K. Under steady state, determine the surface temperature of the rod Ts. (10 pts) (b)Now the heat generation in the rod is stopped, where q'"'...
3. Consider a cylinder of 20 mm in diameter (D) and 100 mm in length (L) that is installed in a duct. Air moves in cross flow over the side surface of the cylinder at a temperature (To) and velocity (V) of 33.7 C and 30 m/s, respectively. If the average cylinder surface temperature (T) is maintained at 120°C, what is the required power generation of the cylinder? Note: (1) Air properties can be found from Table A.4 in the...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of 2 cm and a length of 20 m. The outer surface temperature of the cylinder is 100 °C. The average Nusselt number is 38. The speed of the air before it reaches the cylinder is 10 m/s. Moreover, the freestream temperature of the air before it gets dose to the cylinder are 20 oc. If needed. You may consider the following thermohysical properties of...
Please estimate the initial cooling rate from a cylindrical drink can, which is initially at 35 C, in a refrigerator at 5 C, for two configurations: (a) the can is put vertically, (b) the can is put horizontally. Assuming that the diameter and height of the can are 6 cm and 12 cm, respectively. Neglect the possible heat transfer from end surfaces. (20%) Hint: You may use the Churchill and Chu's correlation to evaluate the heat transfer coefficient due to...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with T; = 20°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe, so that the fluid exits at 60°C. Assuming fully developed flow and taking the average fluid properties to be p = 992.1 kg/m2, k = 0.631 W/m-°C, Cp =...
This is for static air don't just copy from others', this is a
different problem.
1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500 K. The cylinder is left to cool in a large room of static air at 300 K. Calculate a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is 500 K, and 10] 15]...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity k = 240 w/m·K, density ρ = 2700 kg/m3, and specific heat cp-900 נ/kg-K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k240 W/m- K, density p 2700 kg/m, and specific heat c900 J/kg K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of 1000 W/m....
Please show claer solve for ( a,c,d,e ) of this qustion.
mm, electrical resistance per unit length An electrical transmission line (diameter: D=5 r=0.002 Ω/m) carries an electric current (1-100 A), dissipating an electrical power per unit length inr. On a windy day, the line is subjected to air flow (air temperature: T. -10C, air velocity V 50 km/hr) T, 10°C V 50 km/hr T, =? 1 -100 A air elec electrical line We would like to determine the surface...
A nuclear fuel rod with diameter of D=40 mm and length L=1m, has properties of k=1 W/ mK, c=1600J/kg.K, and p=400 kg/mº. (a)Heat is generated uniformly in the rod with q'"' = 2 x 10 W/m. The rod is first cooled in oil with constant temperature Tu= 400 K and average heat transfer coefficient h=50 W/m2K. Under steady state, determine the surface temperature of the rod Ts. (10 pts) (b)Now the heat generation in the rod is stopped, where q'"'...
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