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30 t93 Problem 1- 20 points Consider a...
thumbs up for correct answers( please answer all multiple choice questions) 4, Radiation heat transfer is...
thumbs up for correct answers( please answer all multiple choice
questions)
4, Radiation heat transfer is characterized by A) energy transport as a result of bulk fluid motion A) thermal energy transfer as vibrational energy in the lattice structure of the material ) movement of discrete packets of energy as electromagnetic waves D) circulation of fluid motion by buoyancy effects 15. Consider a 0.2m diameter, 1.8 rm long horizontal cylinder in a room at 20°C . If the outer surface...
A can of engine oil with a length of 155 mm and a diameter of 100...
A can of engine oil with a length of 155 mm and a diameter of 100 mm is placed vertically in the trunk of a car. In a hot summer day, the temperature in the trunk is 43°C. If the surface temperature of the can is 17°C, determine heat transfer rate from the can surface. Neglect the heat transfer from the ends of the can and radiation heat transfer. Given: The properties of air at film temperature of 30°C. k...
A 69-cm x 69-cm circuit board that contains 121 square chips on one side is to...
A 69-cm x 69-cm circuit board that contains 121 square chips on one side is to be cooled by combined natural convection and radiation by mounting it on a vertical surface in a room at 25°C. Each chip dissipates 0.18 W of power, and the emissivity of the chip surfaces is 0.7. Assume the heat transfer from the back side of the circuit board to be negligible, and the temperature of the surrounding surfaces to be the same as the...
Heat Transfer problem, ch9 Will give instant thumbs up! Problem 14: Also, after going over example...
Heat Transfer problem, ch9
Will give instant thumbs up!
Problem 14: Also, after going over example problem 9-2, determine the heat transfer by natural convection for the hot plate facing down with 0 = 30°. Cooling of a Plate in Different Orientations Consider a 0.6-m x 0.6-m thin square plate in a room at 30°C. One side of the plac is maintained at a temperature of 90°C, while the other side is insulated, as shown in Fig. 9-18. Determine the...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
(a) (iWhen is heat transfer through a fluid by conduction or by convection? For what case...
(a) (iWhen is heat transfer through a fluid by conduction or by convection? For what case is the rate of heat transfer higher? How does the convection heat transfer coefficient differ from the thermal conductivity of a fluid? (ii) Explain the physical significance of Nusselt number (ii) By definition, discuss hydraulic diameter. Obtain an expression for hydraulic diameter of a circular tube of diameter, D (b) The local atmospheric pressure in Gboko, Benue State Nigeria (elevation 1610 m), is 834...
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...
Problem 9.013 Your answer is partially correct. Try again. Consider a vertical plate of dimension 0.25...
Problem 9.013 Your answer is partially correct. Try again. Consider a vertical plate of dimension 0.25 m × 0.3 m that is at Ts = 100°C in a quiescent environment at T20°C. In the interest of minimizing heat transfer from the plate, which orientation, (A) or (B), is preferred? What is the convection heat transfer from the front surface of the plate when it is in the preferred orientation? Evaluate the properties of air at the film temperature. it is...
2 ICED WATER IN A SPHERICAL CONTAINER (10 POINTS) Troom = 30°C Iced water O ,...
2 ICED WATER IN A SPHERICAL CONTAINER (10 POINTS) Troom = 30°C Iced water O , D; = 5 m 1.5 cm T = 0°C A 5-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 30°C. The walls of the room are also at 30°C. Heat transfer between the outer surface of the tank and the...
Problem 3 (50 points). A long stainless steel cylinder with diameter of d=55cm is heated up...
Problem 3 (50 points). A long stainless steel cylinder with diameter of d=55cm is heated up to 450°C. The cylinder is then cooled slowly in a chamber at 150°C with an average convection heat transfer coefficient of h = 70 W/m2.°C. (a) Find the temperature at the center of the cylinder after 25 min. (b) Find the heat transfer per unit length of the cylinder during this time period. Cylinder properties: k=15 W/m•°C, p=8000 kg/m², c=477 J/kg•°C, a=3.95x10-6 m²/s.
thumbs up for correct answers( please answer all multiple choice
questions)
4, Radiation heat transfer is characterized by A) energy transport as a result of bulk fluid motion A) thermal energy transfer as vibrational energy in the lattice structure of the material ) movement of discrete packets of energy as electromagnetic waves D) circulation of fluid motion by buoyancy effects 15. Consider a 0.2m diameter, 1.8 rm long horizontal cylinder in a room at 20°C . If the outer surface...
Heat Transfer problem, ch9
Will give instant thumbs up!
Problem 14: Also, after going over example problem 9-2, determine the heat transfer by natural convection for the hot plate facing down with 0 = 30°. Cooling of a Plate in Different Orientations Consider a 0.6-m x 0.6-m thin square plate in a room at 30°C. One side of the plac is maintained at a temperature of 90°C, while the other side is insulated, as shown in Fig. 9-18. Determine the...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
(a) (iWhen is heat transfer through a fluid by conduction or by convection? For what case is the rate of heat transfer higher? How does the convection heat transfer coefficient differ from the thermal conductivity of a fluid? (ii) Explain the physical significance of Nusselt number (ii) By definition, discuss hydraulic diameter. Obtain an expression for hydraulic diameter of a circular tube of diameter, D (b) The local atmospheric pressure in Gboko, Benue State Nigeria (elevation 1610 m), is 834...
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...
Problem 9.013 Your answer is partially correct. Try again. Consider a vertical plate of dimension 0.25 m × 0.3 m that is at Ts = 100°C in a quiescent environment at T20°C. In the interest of minimizing heat transfer from the plate, which orientation, (A) or (B), is preferred? What is the convection heat transfer from the front surface of the plate when it is in the preferred orientation? Evaluate the properties of air at the film temperature. it is...
2 ICED WATER IN A SPHERICAL CONTAINER (10 POINTS) Troom = 30°C Iced water O , D; = 5 m 1.5 cm T = 0°C A 5-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 30°C. The walls of the room are also at 30°C. Heat transfer between the outer surface of the tank and the...
Problem 3 (50 points). A long stainless steel cylinder with diameter of d=55cm is heated up to 450°C. The cylinder is then cooled slowly in a chamber at 150°C with an average convection heat transfer coefficient of h = 70 W/m2.°C. (a) Find the temperature at the center of the cylinder after 25 min. (b) Find the heat transfer per unit length of the cylinder during this time period. Cylinder properties: k=15 W/m•°C, p=8000 kg/m², c=477 J/kg•°C, a=3.95x10-6 m²/s.
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