= 0.243 W/m K) while the bottom surface is exposed to a hot steam at 100°C with a convection hea6-22 The top surface of a metal plate (kplate = 237 W/m-K) is being cooled by air (kairtransfer coefficient of 30 W/m2-K. If the bottom surface temperature of the plate is 80°C, determine the temperature gradient in the air and the temperature gradient in the plate at the top surfaceof the plate.FIGURE P6-22Air, hi ToT2Solid plateTIHot steam, hteam. Tool

The modes of heat transfer occurring here as follows:Heat transfer through convection between hot…

Answered: = 0.243 W/m K) while the bottom surface…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Q) An apple has been put into a freezer at (-18°C) to be cooled. Initially, the apple is at a uniform temperature of 17°C. The convection heat transfer coefficient on its surface is 6 W/m2°C. Assuming the apple as a sphere having a diameter of 10-cm and taking its properties as p = 750 kg/m³, p = 2850 J/kg°c, and k = 0.450 W/m°C, determine; (a) the center temperature of the apple in 45 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.
1. The upper surface of a 50-cm-thick solid brass plate (k=109 W/m·K) is being cooled by water with temperature of 10°C. The upper and lower surfaces of the solid plate maintained at constant temperatures of 60°C and 190°C, respectively. Determine the water convection heat transfer coefficient and the water temperature gradient at the upper plate surface. Water 1111 Ts,2
A large steel plate (1.0% carbon) 5.0 cm thick is initially at a temperature of 425 °C. It is suddenly exposed on both sides to a convective environment with h = 285 W/m² °C, and T. = 65 °C. Determine the centerline temperature and the temperature inside the body 1.25 cm from the surface after 24 minutes. k= 41 W/m-K a = 1.172 × 105 m²/s (at 20 °C)
Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516×10-5 0.7309 25°C 0.02551 1.562x105 0.7296
A mercury-in-glass thermometer having a diameter of 6 mm is placed in a verti- cal position to measure the air temperature in a metal warehouse in the summer. The walls of the warehouse are at 50°C. The convection coefficient is 7 W/m² - °C, and the emissivity of the thermometer may be taken as € = 0.9. Calculate the temperature indicated by the thermometer if the air temperature is 32°C.
The upper surface of a 50-cm-thick solid brass plate (k=109 W/mK) is being cooled by water with temperature of 10°C. The upper and lower surfaces of the solid plate maintained at constant temperatures of 60°C and 190°C, respectively. Determine the water convection heat transfer coefficient and the water temperature gradient at the upper plate surface. Water Ts.l · Ts.,2
0.809 and 0.795 3-176 The overall heat transfer coefficient of a wan s determined to be U= 0,425 W/m-°C under the condi- tions of still air inside and winds of 12 km/h outside. What will the U-factor be when the wind velocity outside is doubled? Answer: 0.428 W/m-°C ransler olls of
When is the heat transfer through a fluid conduction and when is it convection? For which case is the rate of heat transfer higher? How does the convection heat transfer differ from the thermal conductivity of the fluid?
A horizontal pipe with a diameter of 18 cm and a length of 10 m, which contains hot oil and has a surface temperature of 383.8 ° C, has an atmospheric pressure of 760 mm Hg. It is located in an environment (open air) where the temperature is 25 °C. Determine the rate of heat transfer from the pipe to the air (the heat transferred by radiation will be neglected).
What are the differences between velocity boundary layer and thermal boundary layer? Discuss about both boundary layers including the characteristics, the profiles and factors affecting the boundary layers.

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