Calculating Radiation View Factor for Various Shapes

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The discussion focuses on calculating the radiation view factor for various geometric configurations, including flat surfaces, spheres, and concentric spheres. Participants suggest consulting standard heat transfer textbooks for established formulas, particularly for concentric spheres. It is noted that view factors can be determined through area or contour integrations, although caution is advised with contour integration when distances between differential elements are small. The conversation emphasizes the importance of understanding the geometry involved in these calculations. Accurate calculation methods are essential for effective thermal analysis in engineering applications.
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how is radiation view factor calculated especially for the following cases
1-between a flat surface and a sphere
between two flat surfaces at 90
between two surfaces facing each other
between two spheres
 
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How I could calculate veiw factor between two sphere tahat are concenteric
please help me
thank you
 
shoaib85: please refer to any standard book on heat transfer, view factor between concentric spheres can be easily found out using view factor algebra.
Baltistani: View factor between any pair of surfaces can be found by performing 4 area integrations or 2 contour integrations, but I'm not sure if contour integration can be used always, especially when the distance between any two differential element on both surface is less than unity since it gives negative results.
 

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