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Reynolds number in heat exchanger Formula

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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. A region where these forces change behavior is known as a boundary layer, such as the bounding surface in the interior of a pipe. Check FAQs

Re = \frac{Δm \cdot De}{μ}

Re - Reynolds Number?Δm - Mass Flux?De - Equivalent Diameter?μ - Viscosity of Fluid?

Reynolds number in heat exchanger Example

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With units

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Here is how the Reynolds number in heat exchanger equation looks like with Values.

Here is how the Reynolds number in heat exchanger equation looks like with Units.

Here is how the Reynolds number in heat exchanger equation looks like.

1.8E-6 = \frac{0.001 \cdot 0.015}{8.23}

1.8E-6 = \frac{0.001kg/s/m² \cdot 0.015m}{8.23N*s/m²}

1.8E-6 = \frac{0.001 \cdot 0.015}{8.23}

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Reynolds number in heat exchanger Solution

Follow our step by step solution on how to calculate Reynolds number in heat exchanger?

FIRST Step Consider the formula

Re = \frac{Δm \cdot De}{μ}

Next Step Substitute values of Variables

∴

Re = \frac{0.001kg/s/m² \cdot 0.015m}{8.23N*s/m²}

Next Step Convert Units

∴

Re = \frac{0.001kg/s/m² \cdot 0.015m}{8.23Pa*s}

Next Step Prepare to Evaluate

∴

Re = \frac{0.001 \cdot 0.015}{8.23}

Next Step Evaluate

∴

Re = 1.82260024301337E-06

LAST Step Rounding Answer

∴

Re = 1.8E-6

Reynolds number in heat exchanger Formula Elements

Variables

Reynolds Number

Symbol: Re

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Reynolds Number

Mass Flux

Mass Flux is the rate of mass flow. The common symbols are j, J, q, Q, φ, or Φ, sometimes with subscript m to indicate mass is the flowing quantity.

Symbol: Δm

Measurement: Mass FluxUnit: kg/s/m²

Note: Value should be greater than 0.

Formulas to find Mass Flux

Equivalent Diameter

Equivalent diameter is the diameter equivalent to the given value.

Symbol: De

Measurement: LengthUnit: m

Note: Value can be positive or negative.

Formulas to find Equivalent Diameter

Viscosity of Fluid

The Viscosity of fluid is a measure of its resistance to deformation at a given rate.

Symbol: μ

Measurement: Dynamic ViscosityUnit: N*s/m²

Note: Value can be positive or negative.

Formulas to find Viscosity of Fluid

Other formulas in Heat Transfer Through Fin category

Go Mass flux of fluid in transverse fin heat exchanger

Δm = \frac{R e \cdot μ}{De}

Go Heat flow required

Q = A \cdot U overall \cdot ΔT m

Go Overall heat transfer coefficient

U overall = \frac{Q}{A \cdot ΔT m}

Go Logarithmic mean of temperature difference

ΔT m = \frac{Q}{A \cdot U overall}

How to Evaluate Reynolds number in heat exchanger?

Reynolds number in heat exchanger evaluator uses Reynolds Number = (Mass Flux*Equivalent Diameter)/(Viscosity of Fluid) to evaluate the Reynolds Number, The Reynolds number in heat exchanger formula is defined as the inertia force of the fluid to the viscous force of the fluid. Reynolds Number is denoted by Re symbol.

How to evaluate Reynolds number in heat exchanger using this online evaluator? To use this online evaluator for Reynolds number in heat exchanger, enter Mass Flux (Δm), Equivalent Diameter (De) & Viscosity of Fluid (μ) and hit the calculate button.

FAQs on Reynolds number in heat exchanger

What is the formula to find Reynolds number in heat exchanger?

The formula of Reynolds number in heat exchanger is expressed as Reynolds Number = (Mass Flux*Equivalent Diameter)/(Viscosity of Fluid). Here is an example- 1.8E-6 = (0.001*0.015)/(8.23).

How to calculate Reynolds number in heat exchanger?

With Mass Flux (Δm), Equivalent Diameter (De) & Viscosity of Fluid (μ) we can find Reynolds number in heat exchanger using the formula - Reynolds Number = (Mass Flux*Equivalent Diameter)/(Viscosity of Fluid).

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