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eng.radiation-view-factor Calculator
Calculates radiation view factor between parallel plates, coaxial cylinders, or perpendicular surfaces for radiative heat transfer analysis. View factors must satisfy the reciprocity relation (A₁F₁₂ = A₂F₂₁) and the summation rule (ΣFᵢⱼ = 1) — these are checks on calculation accuracy.
Inputs
Area1 M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Area2 M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Separation M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Geometry Type
Reference formula or conversion factor shown for context.
Results
view factor F₁₂
A dimensionless multiplier applied in the calculation.
F₂₁ (reciprocity: A₁F₁₂=A₂F₂₁)
Reference formula or conversion factor shown for context.
heat transfer q (W, ε=1, ΔT=100K)
Thermal energy moving from hot to cold. Rate depends on temperature difference, conductivity, and geometry (Fourier's Law for conduction; Newton's Law of Cooling for convection).
F₁₁ + F₁₂ = 1
Reference formula or conversion factor shown for context.