This page calculates the heat transfer coefficient for fully developed flow in a smooth circular tube. The convection calculation automatically switches between laminar and turbulent convection correlations based on Reynolds number. 

Define the tube size, heat load on the wall, fluid bulk temperature and flow speed. You also need to define the fluid properties. This page will calculate a heat transfer coefficient based on the flow conditions as well as the average tube wall temperature.

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Fluid Properties at Film Temperature (Default is for Air at 20C)

Description Symbol Value Units
Specific Heat Cp J/kg-oC
Thermal Conductivity k W/m-oC
Dynamic Viscosity µ kg/m-s
Density Rho kg/m3

Tube Dimensions

Description Symbol Value Units
Tube Diameter D Meters
Tube Length L Meters
Heat Load q watts
Bulk Fluid Temperature Tb oC
Flow Velocity um m/s

Results for Circular Tube

Description Symbol Value Units
Prandtl Number = Cp*µ / k Pr None
Reynolds Number = Rho*um*D / µ Re None
Friction = f None
Nusselt = Nu None
Heat Transfer Coefficient = Nu*k / D h W/m2-C
Area = Pi * D * L A m2
Average Wall Temperature = Tb + q / (h*A) Tw oC

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