


As is common with fluid mechanics analysis, a number of dimensionless parameters are employed to describe convective heat transfer. A summary of these variables is included in the following tables:


General Convection (Forced and Free)


Parameter 
Formula 
Interpretation 
Prandtl Number: 

Ratio of fluid velocity boundary layer thickness to the fluid temperature boundary layer thickness. 
Nusselt Number: 

Ratio of heat transfered from surface to heat conducted away by fluid. 
Parameter 
Formula 
Interpretation 
Reynolds Number: 

Ratio of fluid inertia stress to viscous stress (for flow over flat plates). 
Reynolds Number: 

(Reynolds Number for pipe flow). 
Stanton Number: 


Parameter 
Formula 
Interpretation 
Grashof Number: 

Ratio of fluid buoyancy stress to viscous stress. 
Rayleigh Number: 


