Example: The view factors between the rectangular surfaces shown in the figure are to be determined. Example: The view factors between the rectangular surfaces shown in thefigure are to be determined.W = 2 mL2 = 1 mA.(2)(1)Аз(3)L3 = 1 m

Calculated view factor of rectangular surfaces.

Answered: Example: The view factors between the…

Example: The view factors between the rectangular surfaces shown in the figure are to be determined. W = 2 m L2 = 1 m A2. (2) (1) Аз (3) L3 = 1 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.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.9P

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Concept explainers

Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.

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11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.
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 .
1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
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11.68 Two infinitely large, black, plane surfaces are 0.3 m apart, and the space between them is filled by an isothermal gas mixture at 811 K and atmospheric pressure. The gas mixture consists of by volume. If one of the surfaces is maintained at 278 K and the other at 1390 K, calculate (a) the effective emissivity of the gas at its temperature, (b) the effective absorptivity of the gas to radiation from the 1390 K surface, (c) the effective absorptivity of the gas to radiation from the 278 K surface, and (d) the net rate of heat transfer to the gas per square meter of surface area.
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A right circular cylinder has a height of 1 m and diameter of 75 cm. Find the view factor for the cylindrical to the base.
Consider the right-circular cylinder of diameter D, length L, and the areas A1, A2, and A3 representing the base, inner, and top surfaces, respectively. (a) Show that the view factor between the base of the cylinder and the inner surface has the form, where H = L/D. F_{12}=2H\left[\left(1+H^2\right)^{\frac{1}{2}}-H\right]F12=2H[(1+H2)21−H] (b) Show that the view factor for the inner surface to itself has the form. F_{22}=1+H-\left(1+H^2\right)^{\frac{1}{2}}F22=1+H−(1+H2)21 8
Calculate the view factor FBA for the following shape. The radii for the hollow circle, circle A and circle B are 8m, 5m, and10m, respectively. Vertical distance is 15m. circle A radii : 8m , 5m circle B radius : 10m vertical distance : 15m
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