Homework Answers
Time 11.42 minute is required to reach temperature at 700 K from 300K
NB:-. answers may be varies with your answer because of only assumed property of carbon steel .
Please take care of it .
Usually ,this analysis always done by using the lumped parameters analysis because smaller diameter of cylinder and also bio number is less than 0.1 .
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Q2:- Carbon steel (AISI 1010) shafts of 0.1-m diameter are heat treated in a gas-fired furnace...
A 100-mm-thick steel (AISI 1010) plate, which is initially at a uniform temperature of 200°C needs...
A 100-mm-thick steel (AISI 1010) plate, which is initially at a uniform temperature of 200°C needs to be heated to a minimum temperature of 550°C. Heating fired furnace with a temperature of 800°C and convection coefficient of 250 W/m2-K on both surfaces of the plate. Determine how long (minutes) the plate should be left in the furnace occurs in a gas-
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it...
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it passes through a furnace at a speed of 2 cm/s. The furnace has a convection coefficient of 80 W/m2-K and an air temperature of 900°C. The furnace is 3 m long, and the stainless steel enters at 20°C. (a) Using a control volume of length S traveling with the rod, develop a differential equation for the rate of change of...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose wall...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
1. You have a sheet of carbon steel with a thickness of 1 mm, a length...
1. You have a sheet of carbon steel with a thickness of 1 mm, a length of 300 mm, and width of 150 mm. You are testing it in a furnace that is flowing hot air over the sheet at 3 m/s at T 1 300 K along the length of the metal. The carbon steel is initially at 300k and has the following properties p 7850 R/ C 430 //kok, and R, 1490 W/mK. The carbon steel is sitting...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by 8 struts to an insulated outer tube of 65-mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel (k = 50 W/m-K). 71-1=3 mm D. D.2...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular...
A heat recovery device involves transferring energy from the hot
flue gases passing through an annular region to pressurized water
flowing through the inner tube of the annulus. The inner tube has
inner and outer diameters of 24 and 30 mm and is connected by 8
struts to an insulated outer tube of 55-mm diameter. Each strut is
3 mm thick and is integrally fabricated with the inner tube from
carbon steel ( k = 50 W/m·K).
Consider conditions for...
QUESTION TWO Carbon steel balls (p 7833 kg/m3, k-54 W/m K, cp 0.465 kJ/kg.0C and a-1.474...
QUESTION TWO Carbon steel balls (p 7833 kg/m3, k-54 W/m K, cp 0.465 kJ/kg.0C and a-1.474 x 10-6 m2/s) 10 mm in diameter are annealed by heating them first to 900'C in a furnace and then allowing them to cool slowly to 100°C in ambient air at 35°C. If the average heat transfer coefficient is 75 W/m2 K, determine how long the annealing process will take. If 2500 balls are to be annealed per hour, determine the total rate of...
PLEASE SHOW WORK Chromium steel ball bearing (k 50 W/m-K, a 1.3x10 m2/s) are to be...
PLEASE SHOW WORK
Chromium steel ball bearing (k 50 W/m-K, a 1.3x10 m2/s) are to be heat treated. They are heated to a temperature of 650 C and then quenched in oil that is at a temperature of 55 C. The ball bearing has a diameter of 4 cm and the convective heat transfer coefficient between the bearings and oil is 300 W/m2 .K. Determine the length of time that the bearing must remain in oil before the temperature drops...
11.5 A heat recovery device involves transferring energy from the hot flue gases passing through ...
11.5 A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by eight struts to an insulated outer tube of 60-mm diameter. Each strut is 4 mm thick and is integrally fabricated with the inner tube from carbon steel (k 50 W/m K). 60 mm 30...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
A 100-mm-thick steel (AISI 1010) plate, which is initially at a uniform temperature of 200°C needs to be heated to a minimum temperature of 550°C. Heating fired furnace with a temperature of 800°C and convection coefficient of 250 W/m2-K on both surfaces of the plate. Determine how long (minutes) the plate should be left in the furnace occurs in a gas-
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it passes through a furnace at a speed of 2 cm/s. The furnace has a convection coefficient of 80 W/m2-K and an air temperature of 900°C. The furnace is 3 m long, and the stainless steel enters at 20°C. (a) Using a control volume of length S traveling with the rod, develop a differential equation for the rate of change of...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
1. You have a sheet of carbon steel with a thickness of 1 mm, a length of 300 mm, and width of 150 mm. You are testing it in a furnace that is flowing hot air over the sheet at 3 m/s at T 1 300 K along the length of the metal. The carbon steel is initially at 300k and has the following properties p 7850 R/ C 430 //kok, and R, 1490 W/mK. The carbon steel is sitting...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by 8 struts to an insulated outer tube of 65-mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel (k = 50 W/m-K). 71-1=3 mm D. D.2...
A heat recovery device involves transferring energy from the hot
flue gases passing through an annular region to pressurized water
flowing through the inner tube of the annulus. The inner tube has
inner and outer diameters of 24 and 30 mm and is connected by 8
struts to an insulated outer tube of 55-mm diameter. Each strut is
3 mm thick and is integrally fabricated with the inner tube from
carbon steel ( k = 50 W/m·K).
Consider conditions for...
QUESTION TWO Carbon steel balls (p 7833 kg/m3, k-54 W/m K, cp 0.465 kJ/kg.0C and a-1.474 x 10-6 m2/s) 10 mm in diameter are annealed by heating them first to 900'C in a furnace and then allowing them to cool slowly to 100°C in ambient air at 35°C. If the average heat transfer coefficient is 75 W/m2 K, determine how long the annealing process will take. If 2500 balls are to be annealed per hour, determine the total rate of...
PLEASE SHOW WORK
Chromium steel ball bearing (k 50 W/m-K, a 1.3x10 m2/s) are to be heat treated. They are heated to a temperature of 650 C and then quenched in oil that is at a temperature of 55 C. The ball bearing has a diameter of 4 cm and the convective heat transfer coefficient between the bearings and oil is 300 W/m2 .K. Determine the length of time that the bearing must remain in oil before the temperature drops...
11.5 A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by eight struts to an insulated outer tube of 60-mm diameter. Each strut is 4 mm thick and is integrally fabricated with the inner tube from carbon steel (k 50 W/m K). 60 mm 30...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
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