Answers: 3
) is a dimensionless factor which compares the sensitivity of a fluid due to convection with those due to conduction:
(Eq. 1)
- Convective heat transfer coefficient, measured in watts per square meter-degree Celsius.
- Conductive heat transfer coefficient, measured in watts per meter-degree Celsius. 
- Characteristic length, measured in meters.
(Eq. 2)
- Radius of the cylinder, measured in meters.
- Length of the cylinder, measured in meters. 
, 
, 
and 
, then the convective heat coefficient is:
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