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Description: Average heat transfer coefficient over a sphere at uniform surface temperature under natural convection.

Reference: Churchill, S.W. Free convection around immersed bodies. in: Fundamentals of Heat and Mass Transfer. Incropera and Dewitt.
Equations/Symbols:

Calculate:
Insert surface temperature (Ts), fluid temperature (Tf), fluid pressure (P), diameter (D) and press 'Calculate'.

Fluid: Water Air R134a Ts (K): Tf (K): Pressure (Pa): D (m):

Fluid properties: ρ=995.35 kg/m3 cp=4,178.85 J/(kg.K) μ=0.000776027 Pa.s k=0.6191 W/(m.K) β=0.000329 1/K	Dimensionless numbers Pr=5.24 Ra=277,821,322.91	Heat transfer coefficient h=437.60 W/m2.K

Heat Transfer Research Group - HTRG
University of Sao Paulo - USP