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class 34 - Radiation Exchange Between Surfaces Click to...

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Click to edit Master subtitle style Radiation Exchange Between Surfaces: Chapter 13 Sections 13.1 through 13.2
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Basic Concepts Basic Concepts Enclosures consist of two or more surfaces that envelop a region of space (typically gas-filled) and between which there is radiation transfer. A nonparticipating medium within the enclosure neither emits, absorbs, nor scatters radiation and hence has no effect on radiation exchange between the surfaces. Each surface of the enclosure is assumed to be isothermal , opaque , diffuse and gray , and to be characterized by uniform radiosity and irradiation . Virtual , as well as real, surfaces may be introduced to form an enclosure.
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View Factor Integral The View Factor (also Configuration or Shape Factor) The view factor, Fij is a geometrical quantity corresponding to the fraction of the radiation leaving surface i that is intercepted by surface j . . ij F Consider exchange between differential areas i : j dA and dA
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The view factor integral provides a general expression for Fij.
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