Thermal entry length Calculator

✖Reynolds Number Dia is the ratio of inertial forces to viscous forces.ⓘ Reynolds Number Dia [Re_D]			+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%
✖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.ⓘ Prandtl Number [Pr]			+10% -10%

✖Length is the measurement or extent of something from end to end.ⓘ Thermal entry length [L]

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Thermal entry length Solution

STEP 0: Pre-Calculation Summary

Formula Used

Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number
L = 0.04*Re_D*D*Pr
This formula uses 4 Variables

Variables Used

Length - (Measured in Meter) - Length is the measurement or extent of something from end to end.
Reynolds Number Dia - Reynolds Number Dia is the ratio of inertial forces to viscous forces.
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.
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.

STEP 1: Convert Input(s) to Base Unit

Reynolds Number Dia: 1600 --> No Conversion Required
Diameter: 10 Meter --> 10 Meter No Conversion Required
Prandtl Number: 0.7 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

L = 0.04*Re_D*D*Pr --> 0.04*1600*10*0.7

Evaluating ... ...

L = 448

STEP 3: Convert Result to Output's Unit

448 Meter --> No Conversion Required

FINAL ANSWER

448 Meter <-- Length

(Calculation completed in 00.004 seconds)

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Home » Physics » Heat and Mass Transfer » Internal Flow » Flow inside tubes » Mechanical » Laminar Flow » Thermal entry length

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Created by Nishan Poojary

Shri Madhwa Vadiraja Institute of Technology and Management (SMVITM), Udupi

Nishan Poojary has created this Calculator and 500+ more calculators!

Verified by Anshika Arya

National Institute Of Technology (NIT), Hamirpur

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Thermal entry length Formula

LaTeX Go

Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number
L = 0.04*Re_D*D*Pr

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 Thermal entry length?

Thermal entry length calculator uses Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number to calculate the Length, The Thermal entry length formula is defined as the distance for incoming flow in a pipe to form a temperature profile of stable shape. Length is denoted by L symbol.

How to calculate Thermal entry length using this online calculator? To use this online calculator for Thermal entry length, enter Reynolds Number Dia (Re_D), Diameter (D) & Prandtl Number (Pr) and hit the calculate button. Here is how the Thermal entry length calculation can be explained with given input values -> 448 = 0.04*1600*10*0.7.

FAQ

What is Thermal entry length?

The Thermal entry length formula is defined as the distance for incoming flow in a pipe to form a temperature profile of stable shape and is represented as L = 0.04*Re_D*D*Pr or Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number. Reynolds Number Dia is the ratio of inertial forces to viscous forces, Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere & 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.

How to calculate Thermal entry length?

The Thermal entry length formula is defined as the distance for incoming flow in a pipe to form a temperature profile of stable shape is calculated using Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number. To calculate Thermal entry length, you need Reynolds Number Dia (Re_D), Diameter (D) & Prandtl Number (Pr). With our tool, you need to enter the respective value for Reynolds Number Dia, Diameter & Prandtl Number and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Length?

In this formula, Length uses Reynolds Number Dia, Diameter & Prandtl Number. We can use 1 other way(s) to calculate the same, which is/are as follows -

Length = 0.04*Diameter*Reynolds Number Dia

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