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Nusselt number Formula

GoNusselt number for gases Formula

GoNusselt number for air Formula

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The Nusselt Number is the ratio of convective to conductive heat transfer at a boundary in a fluid. Convection includes both advection and diffusion. Check FAQs

Nu = 0.37 \cdot {Re}^{0.6}

Nu - Nusselt Number?Re - Reynolds Number?

Nusselt number Example

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With units

Only example

Here is how the Nusselt number equation looks like with Values.

Here is how the Nusselt number equation looks like with Units.

Here is how the Nusselt number equation looks like.

244.109 = 0.37 \cdot 50000^{0.6}

244.109 = 0.37 \cdot 50000^{0.6}

244.109 = 0.37 \cdot 50000^{0.6}

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Nusselt number Solution

Follow our step by step solution on how to calculate Nusselt number?

FIRST Step Consider the formula

Nu = 0.37 \cdot {Re}^{0.6}

Next Step Substitute values of Variables

∴

Nu = 0.37 \cdot 50000^{0.6}

Next Step Prepare to Evaluate

∴

Nu = 0.37 \cdot 50000^{0.6}

Next Step Evaluate

∴

Nu = 244.108963492985

LAST Step Rounding Answer

∴

Nu = 244.109

Nusselt number Formula Elements

Variables

Nusselt Number

The Nusselt Number is the ratio of convective to conductive heat transfer at a boundary in a fluid. Convection includes both advection and diffusion.

Symbol: Nu

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Nusselt Number

Reynolds Number

The Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities.

Symbol: Re

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reynolds Number

Other Formulas to find Nusselt Number

Go Nusselt number for gases

Nu = 2 + {(0.25 \cdot Re + (3 \cdot 10^{- 4}) \cdot ({Re}^{1.6}))}^{0.5}

Go Nusselt number for air

Nu = 430 + ((5 \cdot (10^{- 3})) \cdot (Re)) + ((0.025 \cdot (10^{- 9})) \cdot ({Re}^{2})) - ((3.1 \cdot (10^{- 17})) \cdot ({Re}^{3}))

Go Nusselt number for liquids for external flow

Nu = \frac{0.97 + 0.68 \cdot ({Re}^{0.5})}{{Pr}^{- 0.3}}

Go Nusselt number for oils and water

Nu = \frac{1.2 + 0.53 \cdot ({Re}^{0.54})}{({Pr}^{- 0.3}) \cdot {(\frac{μ w}{μ ∞})}^{0.25}}

How to Evaluate Nusselt number?

Nusselt number evaluator uses Nusselt Number = 0.37*Reynolds Number^0.6 to evaluate the Nusselt Number, Nusselt number formula is defined as a dimensionless value that characterizes convective heat transfer between a sphere and a fluid, providing a measure of the ratio of convective to conductive heat transfer across the boundary layer surrounding the sphere. Nusselt Number is denoted by Nu symbol.

How to evaluate Nusselt number using this online evaluator? To use this online evaluator for Nusselt number, enter Reynolds Number (Re) and hit the calculate button.

FAQs on Nusselt number

What is the formula to find Nusselt number?

The formula of Nusselt number is expressed as Nusselt Number = 0.37*Reynolds Number^0.6. Here is an example- 244.109 = 0.37*50000^0.6.

How to calculate Nusselt number?

With Reynolds Number (Re) we can find Nusselt number using the formula - Nusselt Number = 0.37*Reynolds Number^0.6.

What are the other ways to Calculate Nusselt Number?

Here are the different ways to Calculate Nusselt Number-

Nusselt Number=2+(0.25*Reynolds Number+(3*10^-4)*(Reynolds Number^1.6))^0.5
Nusselt Number=430+((5*(10^-3))*(Reynolds Number))+((0.025*(10^-9))*(Reynolds Number^2))-((3.1*(10^-17))*(Reynolds Number^3))
Nusselt Number=(0.97+0.68*(Reynolds Number^0.5))/(Prandtl Number^-0.3)

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