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Chromium steel ball bearing (k 50 W/m-K, a 1.3x10 m2/s) are to be...
4. Hardening of ball bearings made from Type 440C stainless steel, one of the hardest stainless...
4. Hardening of ball bearings made from Type 440C stainless steel, one of the hardest stainless steels, is accomplished by heating the bearings to 1010 to 1065 °C then quenching (rapidly cooling) them in oil Consider bearings 24 mm in diameter at an initial uniform temperature of 1050 °C, cooled in an oil bath at 50 °C in which the convective heat transfer coefficient is 600 W/(m2 K). Properties of Type 440C Stainless Steel:t Density, 7800 kg/m3 Thermal conductivity, 24...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
An 8 m3 batch of oil with specific heat of 2 kJ/(kg K) and density of...
An 8 m3 batch of oil with specific heat of 2 kJ/(kg K) and density of 850kg/m3 is being heated in a steam-jacketed, agitated vessel with 1.5 m2 of heating surface. The convective heat-transfer coefficient on the oil side is 500W/(m2K), and 10,000 W/(m2K) on the steam side. If the steam temperature is 130°C and the initial temperature is 20 °C, estimate the oil temperature after 10 minutes.
A stainless steel block (H 0.1 m and k 16 W/(m K)) that is perfectly insulated...
A stainless steel block (H 0.1 m and k 16 W/(m K)) that is perfectly insulated on 5 of its 6 sides is floating in space (no convection heat transfer). It is exposed to irradiation, G, of 2500 W/m2. The block is generating heat uniformly where 4x 104 W/m2. The Stefan- Boltzmann constant, o, is 5.67 x 108 W/(m2-K4)·The emissivity of the exposed surface is 0.8. (25 Points) A) What is the exposed surface's temperature? B) What is the maximum...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k =70 W/m.K) with a uniform clearance of 0.6 mm filled wwith tubricating oil (u 0.03 N.s/m2 and k 0.14 W/m.K). The bearing is cooled externally by a liquid, and its outer surface is maintained at 40°C. Disregarding heat conduction through the shaft and assuming one- dimensional heat transfer, determine (a) the rate of heat transfer to the coolant, (b) the sutacs temperature of the...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) i...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
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)...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
Heat transfer bla 5 Consider a stainless steel spoon(k = 15.1 W/m.K), partially immersed in the...
Heat transfer
bla 5 Consider a stainless steel spoon(k = 15.1 W/m.K), partially immersed in the (4 boiling water at 95°C in a kitchen at 25°C. The handle of the spoon has a cross-section 0.2 cm x 1 cm and it extends 18 cm in the air from the free surface of the water. If the heat transfer coefficient on the exposed surface of the spoon is 15 W/m2.K, calculate the temperature difference across the exposed surface of the spoon...
4. Hardening of ball bearings made from Type 440C stainless steel, one of the hardest stainless steels, is accomplished by heating the bearings to 1010 to 1065 °C then quenching (rapidly cooling) them in oil Consider bearings 24 mm in diameter at an initial uniform temperature of 1050 °C, cooled in an oil bath at 50 °C in which the convective heat transfer coefficient is 600 W/(m2 K). Properties of Type 440C Stainless Steel:t Density, 7800 kg/m3 Thermal conductivity, 24...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
A stainless steel block (H 0.1 m and k 16 W/(m K)) that is perfectly insulated on 5 of its 6 sides is floating in space (no convection heat transfer). It is exposed to irradiation, G, of 2500 W/m2. The block is generating heat uniformly where 4x 104 W/m2. The Stefan- Boltzmann constant, o, is 5.67 x 108 W/(m2-K4)·The emissivity of the exposed surface is 0.8. (25 Points) A) What is the exposed surface's temperature? B) What is the maximum...
A 5-cm-diameter shaft rotates at 4500 rpm in a 15-cm long, 8-cm-outer-diameter cast iron bearing (k =70 W/m.K) with a uniform clearance of 0.6 mm filled wwith tubricating oil (u 0.03 N.s/m2 and k 0.14 W/m.K). The bearing is cooled externally by a liquid, and its outer surface is maintained at 40°C. Disregarding heat conduction through the shaft and assuming one- dimensional heat transfer, determine (a) the rate of heat transfer to the coolant, (b) the sutacs temperature of the...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
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)...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
Heat transfer
bla 5 Consider a stainless steel spoon(k = 15.1 W/m.K), partially immersed in the (4 boiling water at 95°C in a kitchen at 25°C. The handle of the spoon has a cross-section 0.2 cm x 1 cm and it extends 18 cm in the air from the free surface of the water. If the heat transfer coefficient on the exposed surface of the spoon is 15 W/m2.K, calculate the temperature difference across the exposed surface of the spoon...
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