 ## Duct

### Circular duct

Input Result
Flow q=
Duct diameter d=
Velocity v=
Kinetic viscosity ν= *10-6 m2/s
Density ρ=
Material roughness k=
Pressure drop Δp=

### Rectangular duct

Input Result
Flow q=
Height a=
Width b=
Kinetic viscosity ν= *10-6 m2/s
Density ρ=
Material roughness k=
Velocity v=
Pressure drop Δp=
Equivalent circular diameter de=

### Flow

The airflow in the estimated circular canal.

### Duct diameter

The actual circular duct diameter. The diameters that are selectable are the usual standard diameters available.

### Kinematic viscosity

Specifies how quickly a liquid spreads relative to its mass if it is poured out on a flat surface. In the original case, the viscosity inematiska sat by air at 20˚C.

### Dynamic viscosity

Are proportionality factor for the force it takes to parallel displace a surface relative to another, if the gap between these surfaces is filled with a viscous liquid or gas.

### Density

Density or volume of the mass is an SI unit and is a measure of a specific substance density, ie mass per unit volume. A synonym for density that can sometimes occur is specific gravity. In the original case, the density is set to air at 20c.

### Width

The width of the current rectangular duct.

### Height

The height of the current rectangular duct.

### Equivalent circular diameter

Shows how much a matched sensed circular duct would need to be to achieve the same values ​​as the current rectangular.

### Pressure

Pipe pressure drop corresponds to the force required to move the medium in the relevant pipe of 1 meter.

### Speed ​​

the velocity of the medium in the tube.

### Material roughness

A material constant that indicates how the material is smooth duct.

### Formula

Flow: Hagen-Poiseuille:  Pressure drop for laminar flow. Pressure drop for turbulent flow.  Approximate solution to Colebrook-White       