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Nusselt number for liquids and gases Formula

GoNusselt Number based on Diameter Formula

GoNusselt number when property variation is larger due to temperature variation 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 = (0.43 + 0.50 \cdot ({Re}^{0.5})) \cdot {Pr}^{0.38}

Nu - Nusselt Number?Re - Reynolds Number?Pr - Prandtl Number?

Nusselt number for liquids and gases Example

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

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

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

1.3518 = (0.43 + 0.50 \cdot (5^{0.5})) \cdot {0.7}^{0.38}

1.3518 = (0.43 + 0.50 \cdot (5^{0.5})) \cdot {0.7}^{0.38}

1.3518 = (0.43 + 0.50 \cdot (5^{0.5})) \cdot {0.7}^{0.38}

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Nusselt number for liquids and gases Solution

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

FIRST Step Consider the formula

Nu = (0.43 + 0.50 \cdot ({Re}^{0.5})) \cdot {Pr}^{0.38}

Next Step Substitute values of Variables

∴

Nu = (0.43 + 0.50 \cdot (5^{0.5})) \cdot {0.7}^{0.38}

Next Step Prepare to Evaluate

∴

Nu = (0.43 + 0.50 \cdot (5^{0.5})) \cdot {0.7}^{0.38}

Next Step Evaluate

∴

Nu = 1.35181651247633

LAST Step Rounding Answer

∴

Nu = 1.3518

Nusselt number for liquids and 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

Prandtl Number

The Prandtl number (Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the ratio of momentum diffusivity to thermal diffusivity.

Symbol: Pr

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Prandtl Number

Other Formulas to find Nusselt Number

Go Nusselt Number based on Diameter

Nu = (0.35 + 0.56 \cdot ({Re}^{0.52})) \cdot {Pr}^{0.33}

Go Nusselt number when property variation is larger due to temperature variation

Nu = 0.25 \cdot ({Re}^{0.6}) \cdot ({Pr}^{0.38}) \cdot {(\frac{P f}{Pr w})}^{0.25}

Go Nusselt number given dynamic viscosity

Nu = (0.4 \cdot ({Re}^{0.5}) + 0.06 \cdot ({Re}^{0.67})) \cdot ({Pr}^{0.4}) \cdot {(\frac{μ ∞}{μ w})}^{0.25}

Go Nusselt number for liquid metals and silicones

Nu = 0.3 + (\frac{0.62 \cdot ({Re}^{0.5}) \cdot ({Pr}^{0.333})}{{(1 + ({(\frac{0.4}{Pr})}^{0.67}))}^{0.25}}) \cdot {(1 + {(\frac{Re}{282000})}^{0.625})}^{0.8}

How to Evaluate Nusselt number for liquids and gases?

Nusselt number for liquids and gases evaluator uses Nusselt Number = (0.43+0.50*(Reynolds Number^0.5))*Prandtl Number^0.38 to evaluate the Nusselt Number, Nusselt number for liquids and gases formula is defined as a dimensionless value that characterizes convective heat transfer between a fluid and a solid surface, providing a measure of the ratio of convective to conductive heat transfer across the boundary layer. Nusselt Number is denoted by Nu symbol.

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

FAQs on Nusselt number for liquids and gases

What is the formula to find Nusselt number for liquids and gases?

The formula of Nusselt number for liquids and gases is expressed as Nusselt Number = (0.43+0.50*(Reynolds Number^0.5))*Prandtl Number^0.38. Here is an example- 1.351817 = (0.43+0.50*(5^0.5))*0.7^0.38.

How to calculate Nusselt number for liquids and gases?

With Reynolds Number (Re) & Prandtl Number (Pr) we can find Nusselt number for liquids and gases using the formula - Nusselt Number = (0.43+0.50*(Reynolds Number^0.5))*Prandtl Number^0.38.

What are the other ways to Calculate Nusselt Number?

Here are the different ways to Calculate Nusselt Number-

Nusselt Number=(0.35+0.56*(Reynolds Number^0.52))*Prandtl Number^0.33
Nusselt Number=0.25*(Reynolds Number^0.6)*(Prandtl Number^0.38)*(Prandtl Number at Film Temperature/Prandtl Number at Wall Temperature)^0.25
Nusselt Number=(0.4*(Reynolds Number^0.5)+0.06*(Reynolds Number^0.67))*(Prandtl Number^0.4)*(Dynamic Viscosity at Free Stream Temperature/Dynamic Viscosity at Wall Temperature)^0.25

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Nusselt number for liquids and gases Formula

​GoNusselt Number based on Diameter Formula

​GoNusselt number when property variation is larger due to temperature variation Formula

Nusselt number for liquids and gases Example

Nusselt number for liquids and gases Solution

Nusselt number for liquids and gases Formula Elements

Other Formulas to find Nusselt Number

How to Evaluate Nusselt number for liquids and gases?

FAQs on Nusselt number for liquids and gases

Variable Name

GoNusselt Number based on Diameter Formula

GoNusselt number when property variation is larger due to temperature variation Formula