A copper ball of diameter 0.2 is at a temperature of 298 K. It is suddenly...
A copper ball of diameter 0.2 is at a temperature of 298 K. It is suddenly plunged into a large water bath whose temperature is 360K. The heat transfer coefficient may be assumed constant and equal to 55 W m-2 K-1. For this ball, the following physical properties may be used: k = 380 W m-1 K-1 , p = 8930 kg m-3, cp = 385 J kg-1 K-1. the time required for the temperature to reach 350 K. will be : (Use lamped capacity method ) * %3D %3D
Homework Answers
In case of any doubt or you need any further help regarding this solution please comment below.
Thank you. Please upvote it.
Please.........
Add Answer to:
A copper ball of diameter 0.2 is at a temperature of
298 K. It is suddenly...
Please solve and show all work thanks #4 A copper ball with a diameter of 10...
Please solve and show all work
thanks
#4 A copper ball with a diameter of 10 cm is at 70 °C throughout and then is suddenly inserted into flowing air at 20 °C. The surface temperature of the ball is measured by a thermocouple to be 55 ° C one minute after the ball is inserted into the flowing air. Assuming that the temperature of the ball is uniform throughout as it cools, determine the heat transfer coefficient (h, W/m'K)...
A long rectangular copper bar of a cross section of 2cm by 3cm and a long...
A long rectangular copper bar of a cross section of 2cm by 3cm and a long cylindrical copper rod of 2.2 cm in diameter are initially at a uniform temperature of 120 °C. They are then exposed to a cooling air stream at 22 °C with a heat transfer coefficient of 180 W/m-K. Taking the properties of the copper to be k = 400 W/m-K and p-8930 kg/m', and C -0.385 kJ/kg-K, determine: a How long would it take for...
A bare copper cable 2.5 cm in diameter is situated in still air at 15°C. A...
A bare copper cable 2.5 cm in diameter is situated in still air at 15°C. A current of 800 Amps is passed along the cable. Heat is transferred from the cable to its surroundings by natural convection for which the heat transfer coefficient may be expressed as 2.95025 W/m2 K. Determine whether or not it may be assumed that the temperature across the copper cross section is uniform and what the equilibrium temperature of the cable surface will be. If...
One of the industrial process is to heat a vegetable oil to a specific temperature by...
One of the industrial process is to heat a vegetable oil to a specific temperature by passing the oil through a metal coil that is placed in a warm water path. The oil flows in the coil with a mass flow rate of 0.05 kg/s at 20◦C. The coil consists of ten turns with a diameter of 50 cm that is made copper tubing (350 W/m. K) of 1 cm inside diameter with a 2 mm wall thickness. The total...
Problem 10.17 The temperature of a flowing gas stream is measured using a bare thermocouple, which...
Problem 10.17
The temperature of a flowing gas stream is measured using a bare
thermocouple, which is a spherical metal bead 1.2 mm in diameter.
The properties of the metal are: denisty = 8000 kg/m^3, cp=450
J/kgK, and k= 25 W/mK. The film coefficient between the gas and the
metal is 310 W/m^2K. If the gas temperature suddenly changes from
200C to 210C, how long will it take for the thermocouple to reach
209C?
10.17. The temperature of a flowing...
(3) Steel ingots (V 40 mm3; A-14 mm2) at 760 K are plunged into a bath...
(3) Steel ingots (V 40 mm3; A-14 mm2) at 760 K are plunged into a bath of quench fluid at 400 K with h- 12 Ww/m2 K. Steel properties are k = 44 W/mK, density 7900 kg/m3, and heat capacity is 0.5 kJ/kgK Temperature of ingot after 45 min C Total amount of heat removed from ball up to 45 min
Supplemental Problem 2.003 A large plate of thickness 2L is at a uniform temperature of Tỉ-190°C,...
I will rate. Thanks so much
Supplemental Problem 2.003 A large plate of thickness 2L is at a uniform temperature of Tỉ-190°C, when it is suddenly quenched by dipping it in a liquid bath of temperature To Heat transfer to the liquid is characterized by the convection coefficient h. Assume x = 0 corresponds to the midplane of the wall -20°C (a) If h = 100 w/m2, K, what is the heat flux atx = L and t = 0?...
1. A thermocouple, which contains a solid copper wire, diameter of 0.1 cm. initially at 150...
1. A thermocouple, which contains a solid copper wire, diameter of 0.1 cm. initially at 150 °C, is suddenly immerse duct, which is 40 °C. The resulting time-versus-temperature profile of the thermocouple is as follows: d in a duct to measure the temperature of the fluid in the Time (s) Temperature (C) 0 27 94 150 125 100 75 Calculate the mean heat transfer coefficient between the fluid in the duct and the surface of the thermocouple For copper, density...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K,...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K, is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are -1.7 W/m-K, 1600 J/kg-K, and 400 kg/m2, while the convection coefficient is 53 W/m2-K. Step 1 When deciding if the lumped capacitance method can be used, what is the value of the Biot number? the tolerance is +/-296 By accessing this Question Assistance, you will learn whille you...
A 2.25 mole sample of carbon dioxide, for which Cp,m= 37.1 JK^-1mol^-1 at 298 K, is...
A 2.25 mole sample of carbon dioxide, for which Cp,m= 37.1 JK^-1mol^-1 at 298 K, is expanded reversibly and adiabatically from a volume of 4.50 L and a temperature of 298 K to a final volume of 32.5 L. Calculate the final temperature, q, w,DeltaH and DeltaU. Assume that Cp,m is constant over the temperature interval. (Show all work)
Please solve and show all work
thanks
#4 A copper ball with a diameter of 10 cm is at 70 °C throughout and then is suddenly inserted into flowing air at 20 °C. The surface temperature of the ball is measured by a thermocouple to be 55 ° C one minute after the ball is inserted into the flowing air. Assuming that the temperature of the ball is uniform throughout as it cools, determine the heat transfer coefficient (h, W/m'K)...
A long rectangular copper bar of a cross section of 2cm by 3cm and a long cylindrical copper rod of 2.2 cm in diameter are initially at a uniform temperature of 120 °C. They are then exposed to a cooling air stream at 22 °C with a heat transfer coefficient of 180 W/m-K. Taking the properties of the copper to be k = 400 W/m-K and p-8930 kg/m', and C -0.385 kJ/kg-K, determine: a How long would it take for...
A bare copper cable 2.5 cm in diameter is situated in still air at 15°C. A current of 800 Amps is passed along the cable. Heat is transferred from the cable to its surroundings by natural convection for which the heat transfer coefficient may be expressed as 2.95025 W/m2 K. Determine whether or not it may be assumed that the temperature across the copper cross section is uniform and what the equilibrium temperature of the cable surface will be. If...
Problem 10.17
The temperature of a flowing gas stream is measured using a bare
thermocouple, which is a spherical metal bead 1.2 mm in diameter.
The properties of the metal are: denisty = 8000 kg/m^3, cp=450
J/kgK, and k= 25 W/mK. The film coefficient between the gas and the
metal is 310 W/m^2K. If the gas temperature suddenly changes from
200C to 210C, how long will it take for the thermocouple to reach
209C?
10.17. The temperature of a flowing...
(3) Steel ingots (V 40 mm3; A-14 mm2) at 760 K are plunged into a bath of quench fluid at 400 K with h- 12 Ww/m2 K. Steel properties are k = 44 W/mK, density 7900 kg/m3, and heat capacity is 0.5 kJ/kgK Temperature of ingot after 45 min C Total amount of heat removed from ball up to 45 min
I will rate. Thanks so much
Supplemental Problem 2.003 A large plate of thickness 2L is at a uniform temperature of Tỉ-190°C, when it is suddenly quenched by dipping it in a liquid bath of temperature To Heat transfer to the liquid is characterized by the convection coefficient h. Assume x = 0 corresponds to the midplane of the wall -20°C (a) If h = 100 w/m2, K, what is the heat flux atx = L and t = 0?...
1. A thermocouple, which contains a solid copper wire, diameter of 0.1 cm. initially at 150 °C, is suddenly immerse duct, which is 40 °C. The resulting time-versus-temperature profile of the thermocouple is as follows: d in a duct to measure the temperature of the fluid in the Time (s) Temperature (C) 0 27 94 150 125 100 75 Calculate the mean heat transfer coefficient between the fluid in the duct and the surface of the thermocouple For copper, density...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K, is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are -1.7 W/m-K, 1600 J/kg-K, and 400 kg/m2, while the convection coefficient is 53 W/m2-K. Step 1 When deciding if the lumped capacitance method can be used, what is the value of the Biot number? the tolerance is +/-296 By accessing this Question Assistance, you will learn whille you...
Most questions answered within 3 hours.
-
On January 1, 2019, ABC Company issued $60,000,000 of 20-year,
10.5% bonds when the market rate...
asked 19 minutes ago -
39.4% of US homes continue to use a landline in addition to cell
phone service. 3...
asked 57 minutes ago -
Starting with benzene, synthesize 1-phenyl-1-butyne.
Show intermediates and reagents.
asked 1 hour ago -
Create a 32-run crossed array design with six control factors
and two noise factors such that...
asked 2 hours ago -
A 500g sample of sand from source A has the following amounts
retained on each sieve....
asked 2 hours ago -
In
your own words, please explain the essay by John Keynes wrote "The
End of Laissez...
asked 2 hours ago -
How are the matrix and pixels related? Why are smaller
pixels better for diagnostic quality?
asked 2 hours ago -
2. An AC generator has 80 rectangular loops on
its armature. Each loop is 11 cm...
asked 2 hours ago -
Please help me with this question. Consider Aldi’s current and
potential geographic markets (see Exhibit 4...
asked 2 hours ago -
What are the main components of the fermentation process and
give an explanation of each? Include...
asked 3 hours ago -
Explain which types of cells in the body (belonging to which
organs, etc.) are sensitive to...
asked 3 hours ago -
A single cable supports an 703-kg elevator car. What is the
tension in the cable when...
asked 3 hours ago