Nusselt Number Calculator

Enter value and click on calculate. Result will be displayed.
Select calculator :
 
Convection Heat Transfer Coefficient (k) :
W/m2-K
Characteristic Length (L) :
m
Thermal Conductivity of the Fluid (k) :
W/m-K
Result:

A Nusselt Number Calculator is a tool used to determine the Nusselt number (Nu), which represents the ratio of convective to conductive heat transfer in a fluid system.

Why Use a Nusselt Number Calculator?

  • Helps in heat transfer analysis for fluids in pipes, over surfaces, or in cooling/heating systems.
  • Used in engineering to design efficient heat exchangers, cooling systems, and insulation materials.
  • Essential in fields like thermodynamics, fluid mechanics, and HVAC.

How Does It Work?

The Nusselt number (Nu) is calculated as:

where:

  • h = convective heat transfer coefficient (W/m²·K)
  • L = characteristic length (m)
  • k = thermal conductivity of the fluid (W/m·K)

It can be computed using empirical correlations depending on flow type (laminar or turbulent) and geometry.

When to Use It?

  • In heat exchanger design for industry, automotive, and aerospace.
  • In cooling systems, like CPU cooling or nuclear reactor design.
  • For predicting heat transfer efficiency in natural or forced convection.