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In radiative heat transfer, a view factor, , is the proportion of the radiation which leaves surface that strikes surface . In a complex 'scene' there can be any number of different objects, which can be divided in turn into even more surfaces and surface segments. View factors are also sometimes known as configuration factors, form factors or shape factors. == Summation of view factors == Because radiation leaving a surface is conserved, the sum of all view factors ''from'' a given surface, , is unity: : For example, consider a case where two blobs with surfaces ''A'' and ''B'' are floating around in a cavity with surface ''C''. All of the radiation that leaves ''A'' must either hit ''B'' or ''C'', or if ''A'' is concave, it could hit ''A''. 100% of the radiation leaving ''A'' is divided up among ''A'', ''B'', and ''C''. Confusion often arises when considering the radiation that ''arrives'' at a ''target'' surface. In that case, it generally does not make sense to sum view factors as view factor from ''A'' and view factor from ''B'' (above) are essentially different units. ''C'' may see 10% of ''A'' 's radiation and 50% of ''B'' 's radiation and 20% of ''C'' 's radiation, but without knowing how much each radiates, it does not even make sense to say that ''C'' receives 80% of the total radiation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「View factor」の詳細全文を読む スポンサード リンク
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