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Thermal entry length Formula

GoHydrodynamic entry length Formula

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Length is the measurement or extent of something from end to end. Check FAQs

L = 0.04 \cdot Re D \cdot D \cdot Pr

L - Length?Re_D - Reynolds Number Dia?D - Diameter?Pr - Prandtl Number?

Thermal entry length Example

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Here is how the Thermal entry length equation looks like with Values.

Here is how the Thermal entry length equation looks like with Units.

Here is how the Thermal entry length equation looks like.

448 = 0.04 \cdot 1600 \cdot 10 \cdot 0.7

448m = 0.04 \cdot 1600 \cdot 10m \cdot 0.7

448 = 0.04 \cdot 1600 \cdot 10 \cdot 0.7

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Thermal entry length Solution

Follow our step by step solution on how to calculate Thermal entry length?

FIRST Step Consider the formula

L = 0.04 \cdot Re D \cdot D \cdot Pr

Next Step Substitute values of Variables

∴

L = 0.04 \cdot 1600 \cdot 10m \cdot 0.7

Next Step Prepare to Evaluate

∴

L = 0.04 \cdot 1600 \cdot 10 \cdot 0.7

LAST Step Evaluate

∴

L = 448m

Thermal entry length Formula Elements

Variables

Length

Length is the measurement or extent of something from end to end.

Symbol: L

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Length

Reynolds Number Dia

Reynolds Number Dia is the ratio of inertial forces to viscous forces.

Symbol: Re_D

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reynolds Number Dia

Diameter

Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

Symbol: D

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Diameter

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 Length

Go Hydrodynamic entry length

L = 0.04 \cdot D \cdot Re D

Other formulas in Laminar Flow category

Go Darcy friction factor

df = \frac{64}{Re D}

Go Reynolds Number given Darcy Friction Factor

Re = \frac{64}{df}

Go Diameter of hydrodynamic entry tube

D = \frac{L}{0.04 \cdot Re D}

Go Diameter of thermal entry tube

D = \frac{L}{0.04 \cdot Re D \cdot Pr}

How to Evaluate Thermal entry length?

Thermal entry length evaluator uses Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number to evaluate 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 evaluate Thermal entry length using this online evaluator? To use this online evaluator for Thermal entry length, enter Reynolds Number Dia (Re_D), Diameter (D) & Prandtl Number (Pr) and hit the calculate button.

FAQs on Thermal entry length

What is the formula to find Thermal entry length?

The formula of Thermal entry length is expressed as Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number. Here is an example- 448 = 0.04*1600*10*0.7.

How to calculate Thermal entry length?

With Reynolds Number Dia (Re_D), Diameter (D) & Prandtl Number (Pr) we can find Thermal entry length using the formula - Length = 0.04*Reynolds Number Dia*Diameter*Prandtl Number.

What are the other ways to Calculate Length?

Here are the different ways to Calculate Length-

Length=0.04*Diameter*Reynolds Number Dia

Can the Thermal entry length be negative?

No, the Thermal entry length, measured in Length cannot be negative.

Which unit is used to measure Thermal entry length?

Thermal entry length is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Thermal entry length can be measured.

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Thermal entry length Formula

​GoHydrodynamic entry length Formula

Thermal entry length Example

Thermal entry length Solution

Thermal entry length Formula Elements

Other Formulas to find Length

Other formulas in Laminar Flow category

How to Evaluate Thermal entry length?

FAQs on Thermal entry length

Variable Name

GoHydrodynamic entry length Formula