Laminar flow, Turbulence flow , Reynolds number, Use of Reynolds number explained here in easy terms in detail

### Blog Content

- Flow Patterns

- Laminar Flow
- Turbulence flow
- Transition flow

- Reynolds number
- Use of Reynolds number.

### Interview Questions from this blog

- What is laminar flow, Laminar flow, Transition flow?
- What is Reynolds number?
- How to predict flow pattern with Reynolds number?
- What is use of Reynolds Number?

### Flow patterns

There are two types of fluid flow pattern- Laminar flow pattern
- Turbulence flow pattern
- Transition flow pattern

#### 1. Laminar flow pattern

- Laminar flow pattern is a decent flow pattern where all layers of fluids are flowing in parallel without any disturbance.
- It following smooth path for flow. There is no swirls or eddies in flow
- Layers of fluids are flowing in straight region
- Smaller pipes with minimum flow has Laminar flow.
- Laminar flow shear stress dependent on Viscosity of fluid & Independent of density of fluids.
- Laminates is term which refers movement of adjacent fluid particles together.
- It is also known as Streamline flow or Viscous flow.

1. High viscous flow at low flow rates

Credits - Quora |

2.Honey dropping with gravity

Credits - Quora |

3. Toothpaste coming out

Credits - Quora |

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####

Turbulence flow

- Turbulence flow is disturbed flow patterns. Where Layers has Irregular fluctuations.

- Fluids with flow rates in large diameter pipe has this turbulence flow. It creates whirlpool
- Adjacent layers fluids are crossing another fluid layers, totally distorted flow.
- Turbulent flow's shear stress depends on density of fluids.
- When flow consisting lines has more elbows, Instruments and other restrictions it makes more turbulence.
- Turbulence filters available for convert turbulence filter for flow sensors.
- Turbulence flow is also known as Chaotic flow

Laminar flow |

#### Examples

1. Water fall

#### Transition flow

It is mixed flow pattern containing both types of flow pattern in mixed.Credits - Quora |

####
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#### Reynolds number

Reynolds number is a flow pattern finding tool. we can analyse flow pattern with this formula.Reynolds number = D * V * ρ / μ

- Re = Reynolds number
- D = Diameter of Pipe, meter
- V = Velocity of Fluids, m/s
- ρ = Density of fluid, kg/m^3
- μ = Viscosity of fluid, kg·m
^{−}^{1}·s^{−}^{1}

If

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####

####

Nu = Nusselt number

Pr = Preandlt number

Di = Pipe inside Diameter

Nu = Nusselt number

Pr = Preandlt number

- Reynolds number < 2300 : Laminar Flow.
- 2300 < Reynolds number < 4000 : Transition Flow.
- 4000 < Reynolds number : Turbulence flow.

### Use of Reynolds number

Reynolds number is used in- To calculate Shell side heat transfer co efficient.
- To calculate Nusselt number in calculation of Tube side heat transfer co efficient.

The heat transfer coefficient is the heat transferred per unit area.

####
**Tube Side Heat transfer Co-efficient**

####
**Sieder-Tate Equation for laminar flow**

Sieder tate equation |

Nu = Nusselt number

**Re = Reynolds number**Pr = Preandlt number

Di = Pipe inside Diameter

µ = Fluid Viscosity of fluid bulk temperature

µ

_{W}= Fluid Viscosity at pipe wall temperature#### Dittus-Bolter Equation for Turbulence flow

Dittus bolter equation for tube side heat transfer co efficient in turbulence flow |

**Re = Reynolds number**Pr = Preandlt number

µ = Fluid Viscosity of fluid bulk temperature

µ

_{W}= Fluid Viscosity at pipe wall temperature#### Shell side heat transfer co efficient

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### Related links

Detail study of Co efficient calculations - Click here

Wikipedia links - Reynolds numberRead more on Quora - Click here

Buy turbulence filter - Click here