Calculating Radiation View Factor for Various Shapes

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SUMMARY

The discussion focuses on calculating radiation view factors for various geometric configurations, including between a flat surface and a sphere, two flat surfaces at 90 degrees, two facing surfaces, and concentric spheres. Participants emphasize the use of view factor algebra for concentric spheres, as detailed in standard heat transfer textbooks. Additionally, it is noted that calculating view factors may involve area or contour integrations, with caution advised regarding contour integration when distances between differential elements are small.

PREREQUISITES
  • Understanding of radiation heat transfer principles
  • Familiarity with view factor algebra
  • Knowledge of area and contour integration techniques
  • Basic concepts of geometric configurations in thermal analysis
NEXT STEPS
  • Study "Fundamentals of Heat and Mass Transfer" for comprehensive coverage of view factors
  • Research "Area Integration Techniques for Radiation View Factors" for practical applications
  • Explore "Contour Integration Methods in Thermal Analysis" for advanced calculations
  • Investigate software tools for thermal analysis, such as ANSYS or COMSOL Multiphysics
USEFUL FOR

Engineers, physicists, and researchers involved in thermal analysis, particularly those focused on radiation heat transfer and geometric configurations in engineering applications.

Baltistani
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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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