Package Contents

	LossFactorData Data structure defining constant loss factor data for dp = zetarhov*\|v\|/2 and functions providing the data for some loss types
	massFlowRate_dp Return mass flow rate from constant loss factor data and pressure drop (m_flow = f(dp))
	massFlowRate_dp_and_Re Return mass flow rate from constant loss factor data, pressure drop and Re (m_flow = f(dp))
	pressureLoss_m_flow Return pressure drop from constant loss factor and mass flow rate (dp = f(m_flow))
	pressureLoss_m_flow_and_Re Return pressure drop from constant loss factor, mass flow rate and Re (dp = f(m_flow))
	BaseModel Generic pressure drop component with constant turbulent loss factor data and without an icon
	BaseModelNonconstantCrossSectionArea Generic pressure drop component with constant turbulent loss factor data and without an icon, for non-constant cross section area
	pressureLoss_m_flow_totalPressure Return pressure drop from constant loss factor and mass flow rate (dp = f(m_flow))

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

This library provides pressure loss factors of a pipe segment (orifice, bending etc.) with a minimum amount of data. If available, data can be provided for both flow directions, i.e., flow from port_a to port_b and from port_b to port_a, as well as for the laminar and the turbulent region. It is also an option to provide the loss factor only for the turbulent region for a flow from port_a to port_b. Basically, the pressure drop is defined by the following equation:

Δp = 0.5*ζ*ρ*v*|v|
   = 0.5*ζ/A^2 * (1/ρ) * m_flow*|m_flow|
   = 8*ζ/(π^2*D^4*ρ) * m_flow*|m_flow|

where

Δp is the pressure drop: Δp = port_a.p - port_b.p
v is the mean velocity.
ρ is the density.
ζ is the loss factor that depends on the geometry of the pipe. In the turbulent flow regime, it is assumed that ζ is constant and is given by "zeta1" and "zeta2" depending on the flow direction.
D is the diameter of the pipe segment. If this is not a circular cross section, D = 4*A/P, where A is the cross section area and P is the wetted perimeter.

QuadraticTurbulent

Package Contents

Information

Wolfram Language