Homework Answers
given
intial temperature Ti=20C
centerline temperature To=70C
T@=80C
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B4: The steel sphere from the unsteady heat transfer experiment is initially at 20 °C. The...
Heat Transfer Problem: A sphere of pure aluminum weighing 6 kg and initially at a temperature...
Heat Transfer Problem:
A sphere of pure aluminum weighing 6 kg and initially at a temperature of 300°C is cooled by an air stream at 20°C with a convection coefficient of 24 W/m2 C. Calculate the time required to cool the sphere center to 100°C.
There is a small sphere with volume, V, surface area, As, and specific heat, c. The sphere was in...
There is a small sphere with volume, V, surface area, As, and specific heat, c. The sphere was initially was at T, and was placed in liquid with temperature To and heat transfer coefficient h. Show the governing equation and temperature as a function of time when (i) Ti > To and (ii) Ti < T. You can use the lumped capacitance analysis. (20 pt) 3.
There is a small sphere with volume, V, surface area, As, and specific heat,...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing the temperature–time history of a sphere fabricated from pure copper. The sphere, which is 20.0 mm in diameter, is at 70°C before it is inserted into the gas stream having a temperature of 27°C. A thermocouple on the outer surface of the sphere indicates 50°C 97 s after the sphere is inserted into the hydrogen. Find a) What is the value of the specific...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing the temperature–time history of a sphere fabricated from pure copper. The sphere, which is 20.0 mm in diameter, is at 90°C before it is inserted into the gas stream having a temperature of 27°C. A thermocouple on the outer surface of the sphere indicates 40°C 97 s after the sphere is inserted into the hydrogen. Step 1 What is the value of the specific...
A long steel bar (20 mm diameter) at 455°C is placed horizontally in a water bath...
A long steel bar (20 mm diameter) at 455°C is placed horizontally in a water bath at 100°C under atmospheric pressure. (a) Estimate the initial heat transfer rate per unit length of the bar to the water when it is initially placed in water. You may assume emissivity of the steel bar to be 1. (b) What type of heat transfer mechanism is present when the bar has cooled to 110°C.
A large stainless steel (AISI 316) plate having a thickness of 5 mm is initially at...
A large stainless steel (AISI 316) plate having a thickness of 5 mm is initially at a temperature of 70°C, and both sides of the plate are suddenly exposed to a convection environment at 20°C with the heat transfer coefficient of h= 800 W/m 2 oC. What will be the center and surface temperatures of the plate after 10 s? For stainless steel (AISI 316), α = 348x10-6 m2/s and k = 13.4 W/m K.
Help mee!! Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe...
Help mee!!
Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
7. (20 pts) A sphere with 30 mm in diameter initially at 800 K is quenched...
7. (20 pts) A sphere with 30 mm in diameter initially at 800 K is quenched in a large bath having a constant temperature of 320 K with a convection heat transfer of 75 W/m2.K. The thermophysical properties of the sphere material are: p=400 kg/mº, c=1600 J/kg-K, and k=1.7 W/mK. (Use characteristic length Lc=VIA to determine applicability of lumped method; Use radius of the sphere for one term approximation) a) Calculate the time required for the surface of the sphere...
I need Q5 Heat transfer Problem(.) In an experiment, it is found that the local convection...
I need Q5
Heat transfer
Problem(.) In an experiment, it is found that the local convection coefficient on a flat plate of length L is given by: (10 marks) h,-o923 (k/x){(V. ?.?)/p)as, where k, V, p, and ? are constants. Determine the average convection coefficient over the plate h Problem (5) (10 marks) Milk is flowing with a mass flow rate m 0.6 kg/s, in a pipe with internal diameter - 3 cm. Its initial temperature is 50 °C and...
table A-13 heat transfer book Consider a thin plate of 20 cm by 20 cm is...
table A-13 heat transfer book
Consider a thin plate of 20 cm by 20 cm is standing vertically in air. One side of the plate is insulated. The plate surface temperature is 50°C. The room air temperature where the plate is located is 20'C. Determine: (a) Is the flow laminar or turbulent? (b) What Nu number correlation will you use to find h? Find Nu. (C) Find the convection heat transfer coefficient (h) (d) Find the rate of convection heat...
Heat Transfer Problem:
A sphere of pure aluminum weighing 6 kg and initially at a temperature of 300°C is cooled by an air stream at 20°C with a convection coefficient of 24 W/m2 C. Calculate the time required to cool the sphere center to 100°C.
There is a small sphere with volume, V, surface area, As, and specific heat, c. The sphere was initially was at T, and was placed in liquid with temperature To and heat transfer coefficient h. Show the governing equation and temperature as a function of time when (i) Ti > To and (ii) Ti < T. You can use the lumped capacitance analysis. (20 pt) 3.
There is a small sphere with volume, V, surface area, As, and specific heat,...
A large stainless steel (AISI 316) plate having a thickness of 5 mm is initially at a temperature of 70°C, and both sides of the plate are suddenly exposed to a convection environment at 20°C with the heat transfer coefficient of h= 800 W/m 2 oC. What will be the center and surface temperatures of the plate after 10 s? For stainless steel (AISI 316), α = 348x10-6 m2/s and k = 13.4 W/m K.
Help mee!!
Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
7. (20 pts) A sphere with 30 mm in diameter initially at 800 K is quenched in a large bath having a constant temperature of 320 K with a convection heat transfer of 75 W/m2.K. The thermophysical properties of the sphere material are: p=400 kg/mº, c=1600 J/kg-K, and k=1.7 W/mK. (Use characteristic length Lc=VIA to determine applicability of lumped method; Use radius of the sphere for one term approximation) a) Calculate the time required for the surface of the sphere...
I need Q5
Heat transfer
Problem(.) In an experiment, it is found that the local convection coefficient on a flat plate of length L is given by: (10 marks) h,-o923 (k/x){(V. ?.?)/p)as, where k, V, p, and ? are constants. Determine the average convection coefficient over the plate h Problem (5) (10 marks) Milk is flowing with a mass flow rate m 0.6 kg/s, in a pipe with internal diameter - 3 cm. Its initial temperature is 50 °C and...
table A-13 heat transfer book
Consider a thin plate of 20 cm by 20 cm is standing vertically in air. One side of the plate is insulated. The plate surface temperature is 50°C. The room air temperature where the plate is located is 20'C. Determine: (a) Is the flow laminar or turbulent? (b) What Nu number correlation will you use to find h? Find Nu. (C) Find the convection heat transfer coefficient (h) (d) Find the rate of convection heat...
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