Nusselt number for short pipes Calculator

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Internal Flow

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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.ⓘ Nusselt Number [Nu]			+10% -10%
✖Constant a is the empirical constant given according to conditions in sutherland equation.ⓘ Constant a [a]			+10% -10%
✖Length is the measurement or extent of something from end to end.ⓘ Length [L]			+10% -10%
✖Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.ⓘ Diameter [D]			+10% -10%

✖Nusselt Number for Short Pipes is a measure of the ratio between heat transfer by convection and heat transfer by conduction alone in the pipes of small lengths.ⓘ Nusselt number for short pipes [Nu_Avg]

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Formula

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Nusselt number for short pipes

Formula

`"Nu"_{"Avg"} = "Nu"*(1+("a"/("L"/"D")))`

Example

`"45"="5"*(1+("2.4"/("3m"/"10m")))`

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Nusselt number for short pipes Solution

STEP 0: Pre-Calculation Summary

Formula Used

Nusselt Number for Short Pipes = Nusselt Number*(1+(Constant a/(Length/Diameter)))
Nu_Avg = Nu*(1+(a/(L/D)))
This formula uses 5 Variables

Variables Used

Nusselt Number for Short Pipes - Nusselt Number for Short Pipes is a measure of the ratio between heat transfer by convection and heat transfer by conduction alone in the pipes of small lengths.
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.
Constant a - Constant a is the empirical constant given according to conditions in sutherland equation.
Length - (Measured in Meter) - Length is the measurement or extent of something from end to end.
Diameter - (Measured in Meter) - Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

STEP 1: Convert Input(s) to Base Unit

Nusselt Number: 5 --> No Conversion Required
Constant a: 2.4 --> No Conversion Required
Length: 3 Meter --> 3 Meter No Conversion Required
Diameter: 10 Meter --> 10 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Nu_Avg = Nu*(1+(a/(L/D))) --> 5*(1+(2.4/(3/10)))

Evaluating ... ...

Nu_Avg = 45

STEP 3: Convert Result to Output's Unit

45 --> No Conversion Required

FINAL ANSWER

45 <-- Nusselt Number for Short Pipes

(Calculation completed in 00.004 seconds)

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< 14 Turbulent Flow Calculators

Nusselt number for Smooth tubes

Go Nusselt Number = 0.027*(Reynolds Number Dia^0.8)*(Prandtl Number^0.333)*(Dynamic Viscosity at Mean Temperature/Dynamic Viscosity at Wall Temperature)^0.14

Nusselt Number given viscosity of fluid

Go Nusselt Number = ((0.027)*((Reynolds Number)^(0.8)))*((Prandtl Number)^(1/3))*((Average Viscosity of Fluid/Wall Viscosity)^(0.14))

Friction factor for rough tubes

Go Friction Factor = 1.325/((ln((Surface Roughness/3.7*Diameter)+(5.74/(Reynolds Number^0.9))))^2)

Nusselt number at entrance region

Go Nusselt Number = 0.036*(Reynolds Number Dia^0.8)*(Prandtl Number^0.33)*(Diameter/Length)^0.055

Nusselt number for short pipes

Go Nusselt Number for Short Pipes = Nusselt Number*(1+(Constant a/(Length/Diameter)))

Nusselt number for constant heat flux

Go Nusselt Number = 4.82+0.0185*(Reynolds Number Dia*Prandtl Number)^0.827

Nusselt number for liquid metals at constant wall temperature

Go Nusselt Number = 5+0.025*(Reynolds Number Dia*Prandtl Number)^0.8

Friction factor for Re greater than 2300

Go Friction Factor = 0.25*(1.82*log10(Reynolds Number Dia)-1.64)^-2

Nusselt number for smooth tubes and fully developed flow

Go Nusselt Number = 0.625*(Reynolds Number Dia*Prandtl Number)^0.4

Stanton number at bulk temperature

Go Stanton Number = Friction Factor/(8*(Prandtl Number^0.67))

Friction factor for rough tube Colburn analogy

Go Friction Factor = 8*Stanton Number*(Prandtl Number^0.67)

Friction factor for Re greater than 10000

Go Friction Factor = 0.184*Reynolds Number Dia^(-0.2)

Friction factor for transitional turbulent flow

Go Friction Factor = 0.316*Reynolds Number Dia^-0.25

Nusselt number for thermal entry region

Go Nusselt Number = 3.0*Reynolds Number Dia^0.0833

Nusselt number for short pipes Formula

Nusselt Number for Short Pipes = Nusselt Number*(1+(Constant a/(Length/Diameter)))
Nu_Avg = Nu*(1+(a/(L/D)))

What is internal flow?

internal flow is a flow for which the fluid is confined by a surface. Hence the boundary layer is unable to develop without eventually being constrained. The internal flow configuration represents a convenient geometry for heating and cooling fluids used in chemical processing, environmental control, and energy conversion technologies.

An example includes flow in a pipe.

How to Calculate Nusselt number for short pipes?

Nusselt number for short pipes calculator uses Nusselt Number for Short Pipes = Nusselt Number*(1+(Constant a/(Length/Diameter))) to calculate the Nusselt Number for Short Pipes, The Nusselt number for short pipes formula is defined as the ratio between heat transfer by convection (α) and heat transfer by conduction alone. Nusselt Number for Short Pipes is denoted by Nu_Avg symbol.

How to calculate Nusselt number for short pipes using this online calculator? To use this online calculator for Nusselt number for short pipes, enter Nusselt Number (Nu), Constant a (a), Length (L) & Diameter (D) and hit the calculate button. Here is how the Nusselt number for short pipes calculation can be explained with given input values -> 45 = 5*(1+(2.4/(3/10))).

FAQ

What is Nusselt number for short pipes?

The Nusselt number for short pipes formula is defined as the ratio between heat transfer by convection (α) and heat transfer by conduction alone and is represented as Nu_Avg = Nu*(1+(a/(L/D))) or Nusselt Number for Short Pipes = Nusselt Number*(1+(Constant a/(Length/Diameter))). The Nusselt Number is the ratio of convective to conductive heat transfer at a boundary in a fluid. Convection includes both advection and diffusion, Constant a is the empirical constant given according to conditions in sutherland equation, Length is the measurement or extent of something from end to end & Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

How to calculate Nusselt number for short pipes?

The Nusselt number for short pipes formula is defined as the ratio between heat transfer by convection (α) and heat transfer by conduction alone is calculated using Nusselt Number for Short Pipes = Nusselt Number*(1+(Constant a/(Length/Diameter))). To calculate Nusselt number for short pipes, you need Nusselt Number (Nu), Constant a (a), Length (L) & Diameter (D). With our tool, you need to enter the respective value for Nusselt Number, Constant a, Length & Diameter and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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