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Rotating Channel (IL)

Rotating pipe with a fluid channel in an isothermal liquid network

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  • Rotating Channel (IL) block

Description

The Rotating Channel (IL) block models a rotating pipe with a fluid channel in an isothermal liquid network. The pipe angular velocity is set by a physical signal at port W. Ports A and B are isothermal liquid inlet and outlet ports.

Fluid passing through a rotating channel experiences pressure changes due to resistance passing through the casing orifice and due to the fluid angular momentum. An internal connection to an Orifice (IL) block accounts for the local resistances. The pressure change in the block is modeled as:

P=ρAW2rB22,

where:

  • ρA is the fluid density at port A.

  • W is the shaft angular velocity, received as a physical signal at port W.

  • rB is the radius of rotation at port B.

The isothermal liquid outlet port can be connected to a Rotating Cylinder Force (IL) block to model components such as a Rotating Single-Acting Actuator (IL).

Assumptions and Limitations

  • The effects of fluid inertia are not calculated.

  • The pipe angular velocity is assumed to be constant or changes very slowly.

Ports

Conserving

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Liquid entry or exit port.

Liquid entry or exit port.

Input

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Rotating shaft angular velocity in rad/s, specified as a physical signal.

Parameters

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Shaft channel cross-sectional area for liquid entry/exit.

Radius of swept circle of pipe rotation, specified at port B.

Correction factor that accounts for discharge losses in theoretical flows.

Upper Reynolds number limit for laminar flow through the orifice.

Introduced in R2020a