# Nusselt Number Calculation (Heat Transfer)

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**Formula:**`Nu = (fluidVelocity × characteristicLength) / kinematicViscosity`

## Introduction to Nusselt Number Calculation (Heat Transfer)

The Nusselt number is a dimensionless number used to describe the process of convection heat transfer. It is used to correlate forced, natural, and mixed convection processes. The Nusselt number, Nu, is defined as the ratio of convective to conductive heat transfer across the boundary layer. The formula uses ** fluidVelocity** (velocity of the fluid),

**(characteristic length of the object),**

*characteristicLength***(kinematic viscosity of the fluid), and**

*kinematicViscosity***(thermal conductivity of the fluid).**

*thermalConductivity*## Parameter usage:

`fluidVelocity`

= velocity of the fluid`characteristicLength`

= characteristic length of the object`kinematicViscosity`

= kinematic viscosity of the fluid`thermalConductivity`

= thermal conductivity of the fluid

## Output:

`Nu`

= Nusselt number

## Data validation

The numbers should be greater than zero.

## Summary

This calculator computes the Nusselt number for heat transfer applications, based on the characteristics of the fluid and object in question.

Tags: Heat Transfer, Convection, Nusselt Number, Fluid Dynamics