29. Gamma radiation is bombarding an iron plate as shown in the figure. A con- vection boundary condition of T;= 150 C and h = 200 W/m-K removes heat from the plate. Find the maximum temperature and its location in the plate. Also find temperature at 1 cm from the side facing irradiation and the rate of heat removal from the side not being irradiated. k = 48.5 kW/m K, µ = 24.6 m'.

29. Gamma radiation is bombarding an iron plate as shown in the figure. A con- vection boundary condition of T;= 150 C and h = 200 W/m-K removes heat from the plate. Find the maximum temperature and its location in the plate. Also find temperature at 1 cm from the side facing irradiation and the rate of heat removal from the side not being irradiated. k = 48.5 kW/m K, µ = 24.6 m'.

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.51P

See similar textbooks

Similar questions

Determine the power requirement of a soldering iron in which the tip is maintained at 400C. The tip is a cylinder 3 mm in diameter and 10 mm long. The surrounding air temperature is 20C, and the average convection heat transfer coefficient over the tip is 20W/m2K. The tip is highly polished initially, giving it a very low emittance.
Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.
A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 270 K. If the wire is at 800 K, calculate the net rate of heat loss. Discuss your assumptions.
1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal to the emittance) of 0.1. Then determine the rate of evaporation of the liquid oxygen in kilograms per second and pounds per hour, assuming that convection can be neglected. The heat of vaporization of oxygen at –183°C is .
Three thin sheets of polished aluminum are placed parallel to each other so that the distance between them is very small compared to the size of the sheets. If one of the outer sheets is at 280C and the other outer sheet is at 60C, calculate the temperature of the intermediate sheet and the net rate of heat flow by radiation. Convection can be ignored.
2.51 Determine by means of a flux plot the temperatures and heat flow per unit depth in the ribbed insulation shown in the accompanying sketch.
A flat-plate collector with one glass cover is placed in horizontal. The absorber plate temperature is 95 oC and its emittance is 0,12. The glass cover temperature is 45 oC, and the (glass) cover has an emittance of 0.85. The plate-cover spacing is 15 mm. The ambient and surrounding temperature are equal at 25 oC. The wind velocity is 20 km/hour. If solar radiation is 850 W/m2 , and the plate absorptivity is 95%, calculate over all heat transfer coefficient losses and the useful energy (W/m2 ). ----- s
a certain body at 20 C is display on a top of a building during the night. the body sees nothing but the sky which has effective temperature of 110 k. determine the heat transfer rate from the body to the sky if the body temperature is maintained at 23 C. the surface to the sky emissivity of the body is equal to 0.92
A small, oxidized, horizontal metal tube with an OD of 0.0254 m (1 in.), 0.61 m (2 ft) long, and with a surface temperature at 588 K (600°F) is in a very large furnace enclosure with fire-brick walls and the surrounding air at 1088 K (1500°F). The emissivity of the metal tube is 0.60 at 1088 K and 0.46 at 588 K. Calculate the heat transfer to the tube by radiation using SI units and AES units.
A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T = 15C and Tsur = 80C, respectively. The convection heat transfer coefficient is h = 40 W/(m2K) and the absorptivity of the exposed surface is  = 0.8. Determine the convective and radiative heat fluxes to the wall at x = 0 in W/m2, if the wall surface temperature is 24C. Assume the exposed wall surface is gray (meaning  = ) and the surroundings are much larger than the wall surface.
Two concentric spheres of diameters D1 = 0.3 m andD2 = 0.4 m are maintained at uniform temperatures T1 = 700 Kand T2 = 500 K and have emissivities «1 = 0.5 and «2 = 0.7,respectively. Determine the net rate of radiation heat transferbetween the two spheres. Also, determine the convection heattransfer coefficient at the outer surface if both the surroundingmedium and the surrounding surfaces are at 30°C. Assume theemissivity of the outer surface is 0.35.
A concrete ball of radius 2.32 m and emissivity 0.620 is heated to 123°C. (a) Convert the given temperature to Kelvin. (Enter your answer to at least three significant figures.) ?K (b) What is the surface area (in m2) of the ball? ?m2 (c) If the ambient temperature is 26.0°C, what net power (in W) does the ball radiate? ?W