6.3. A solid steel sphere (AISI 1010), 300 mm in diameter, is coated with a dielectric materiallayer of thickness 2 mm and thermal conductivity 0.04W/m ⚫ K. The coated sphere is initially ata uniform temperature of 500°C and is suddenly quenched in a large oil bath for which To=100°C and h 3300 W/m² K. Estimate the time required for the coated sphere temperature toreach 140°C. Hint: Neglect the effect of energy storage in the dielectric material, since itsthermal capacitance (pcV) is small compared to that of the steel sphere.

Analyzing the Problem and AssumptionsWe are tasked with estimating the time required for a coated…

Answered: 6.3. A solid steel sphere (AISI 1010),…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.26P

See similar textbooks

Similar questions

5.10 A steel sphere (AISI 1010), 100 mm in diameter, is coated with a dielectric material layer of thickness 2 mm and thermal conductivity 0.04 W/mK. The coated sphere is initially at a uniform temperature of 500°C and is suddenly quenched in a large oil bath for which T = 100°C and h = 3000 W/m² K. Estimate the time required for the coated sphere temperature to reach 150°C. Hint: Neglect the effect of energy storage in the dielectric material, since its thermal capacitance (pcV) is small compared to that of the steel sphere.
A steel sphere (AISI 1010), 100 mm in diameter, is coated with a dielectric material layer of thickness 1.75 mm and thermal conductivity 0.04 W/m.K. The coated sphere is initially at a uniform temperature of 500°C and is suddenly quenched in a large oil bath for which T = 100°C and h = 3000 W/m².K. Estimate the time, in h, required for the coated sphere temperature to reach 150°C. Hint: Neglect the effect of energy storage in the dielectric material, since its thermal capacitance (pc)is small compared to that of the steel sphere. t = h
i need the answer quickly
A polished stainless steel sphere (r= 5cm) is at a temperature of 540 C. The ambier air is at 20 C. What is the instantaneous heat transfer rate?
A long insulated tube is doped with an exothermic ma- terial which generates steady and uniform heat at rate of è [W/m³]. The tube has an inner radius r₁ and outer radius r₂. The temperature of the outer insulated sur- face is T₂. This tube is used to heat a liquid flowing through it. (a) Write the governing differential equation and boundary conditions to determine the tempera- ture distribution inside the tube. (b) What is the heat flux supplied to the liquid by the tube? e (√₂²-1₁²) / 21₁ 1 Fluid Figure 2: Schematic Insulation T₂ N
i need the answer quickly
Q2/ An aluminum sphere weighting 7kg and initially at a temperature of 533K is suddenly immersed in a fluid at 283K. if heat transfer coefficient between the sphere and fluid is 50W/m?.°C. Take density=2707kg/m3, specific heat=0.9KJ/kg.ºC and thermal conductivity= 204W/m°C. Determine th Bi number and And determine the time required to cool sphere to 263k
Example 3.3: The temperature at the center of a tender-boiled potato needs to be 98.9°C. Let's take a potato with 4 cm diameter at 5°C and and put it in vigorously boiling water at 100 °C, where convection coefficient is 1200 W/m². c. How much time will it take to cook the potato? Potato properties: density p=1070 kg/m³, conductivity k=0.8 W/m.°c, specific heat c = 3400 J/kg-°C.
I need the answer as soon as possible
A chip that is of length L = 5.5 mm on a side and thickness t = 2.0 mm is encased in a ceramic substrate, and its exposed surface is convectively cooled by a dielectric liquid for which h = 150 W/m² K and To = 20°C. . Th Chip, q, T₁, P, Cp The time is Substrate In the off-mode the chip is in thermal equilibrium with the coolant (T; = T). When the chip is energized, however, its temperature increases until a new steady state is established. For purposes of analysis, the energized chip is characterized by uniform volumetric heating with a = 9 x 106 W/m³. Assuming an infinite contact resistance between the chip and substrate and negligible conduction resistance within the chip, determine the steady-state chip temperature Tƒ. Following activation of the chip, how long does it take to come within 1°C of this temperature? The chip density and specific heat are p = 2000 kg/m³ and c = 700 J/kg-K, respectively. The steady-state chip temperature Tf is i S. °C.
Please show all steps not Ai generated they have been wrong and I need to understand whats goin on. A steel sphere (AISI 1010), 100 mm in diameter, is coated with a dielectric material layer of thickness 2 mm and thermal conductivity 0.04 W/m • K. The coated sphere is initially at a uniform temperature of 500°C and is suddenly quenched in a large oil bath for which To = 100°C and h = 3000 W/m • K. Estimate the time required for the coated sphere temperature to reach 150°C. Hint: Neglect the effect of energy storage in the dielectric material, since its thermal capacitance (pcV) is small compared to that of the steel sphere.
5.6 Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air envi- ronment for which T325 K and h = 20 W/m².K. Assuming the properties of the steel to be k = 40 W/mK, p= 7800 kg/m³, and c = 600 J/kg K, estimate the time required for the cooling process.

SEE MORE QUESTIONS

Recommended textbooks for you

Principles of Heat Transfer (Activate Learning wi…

Mechanical Engineering

ISBN:

9781305387102

Author:

Kreith, Frank; Manglik, Raj M.

Publisher:

Cengage Learning