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Home/Reference Data/Radiation View Factors/Enclosure/small-surface-large-enclosure

Small-Surface-Large-Enclosure — Enclosure

Geometry Class
Enclosure
Geometry Id
Small Surface Large Enclosure
Configuration Notes
Limiting case: When A1<<A2 All Radiation From A1 Is Intercepted by A2 So F12=1. F21=A1/A2→0. Applies to: Small Body in Large room, Sphere in Large enclosure, Thermocouple in duct.
Formula Expression
F12=1; F21=A1/A2≈0
Geometry Description
Small Convex Surface (A1) Completely Enclosed by a Large Surface (A2); A1/A2→0
Param 1 Name
A1 Over A2
Param 1 Value
0
Reciprocity F21
0
Surface 1
Small Convex Surface A1
Surface 2
Large Enclosing Surface A2
View Factor F12
1

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enclosure — geometry id small_surface_large_enclosure · configuration notes Limiting case: when A1<<A2 all radiation from A1 is intercepted by A2 so F12=1… · geometry description Small convex surface (A1) completely enclosed by a large surface (A2); A1/A2→0 · formula expression F12=1; F21=A1/A2≈0 · surface 1 Small convex surface A1 | Radiation View Factors | Engineering Database