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Nusselt number for gases Formula

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

Nu - Nusselt Number?Re - Reynolds Number?

Nusselt number for gases Example

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

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

Here is how the Nusselt number for gases equation looks like.

151.654 = 2 + {(0.25 \cdot 50000 + (3 \cdot 10^{- 4}) \cdot (50000^{1.6}))}^{0.5}

151.654 = 2 + {(0.25 \cdot 50000 + (3 \cdot 10^{- 4}) \cdot (50000^{1.6}))}^{0.5}

151.654 = 2 + {(0.25 \cdot 50000 + (3 \cdot 10^{- 4}) \cdot (50000^{1.6}))}^{0.5}

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Nusselt number for gases Solution

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

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

Nu = 2 + {(0.25 \cdot 50000 + (3 \cdot 10^{- 4}) \cdot (50000^{1.6}))}^{0.5}

Next Step Prepare to Evaluate

∴

Nu = 2 + {(0.25 \cdot 50000 + (3 \cdot 10^{- 4}) \cdot (50000^{1.6}))}^{0.5}

Next Step Evaluate

∴

Nu = 151.653965302616

LAST Step Rounding Answer

∴

Nu = 151.654

Nusselt number for gases 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

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

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 for gases?

Nusselt number for gases evaluator uses Nusselt Number = 2+(0.25*Reynolds Number+(3*10^-4)*(Reynolds Number^1.6))^0.5 to evaluate the Nusselt Number, Nusselt number for gases formula is defined as a dimensionless quantity used to characterize convective heat transfer between a sphere and a fluid, typically air or gas, in various engineering and scientific applications, such as heat exchangers, combustion systems, and atmospheric science. Nusselt Number is denoted by Nu symbol.

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

FAQs on Nusselt number for gases

What is the formula to find Nusselt number for gases?

The formula of Nusselt number for gases is expressed as Nusselt Number = 2+(0.25*Reynolds Number+(3*10^-4)*(Reynolds Number^1.6))^0.5. Here is an example- 151.654 = 2+(0.25*50000+(3*10^-4)*(50000^1.6))^0.5.

How to calculate Nusselt number for gases?

With Reynolds Number (Re) we can find Nusselt number for gases using the formula - Nusselt Number = 2+(0.25*Reynolds Number+(3*10^-4)*(Reynolds Number^1.6))^0.5.

What are the other ways to Calculate Nusselt Number?

Here are the different ways to Calculate Nusselt Number-

Nusselt Number=0.37*Reynolds Number^0.6
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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