Volumetric Flow Rate Sensor (MA)

Measure volumetric flow rate in a moist air network

Library:
Simscape / Foundation Library / Moist Air / Sensors

Description

The Volumetric Flow Rate Sensor (MA) block represents an ideal sensor that measures volumetric flow rate in a moist air network. There is no change in pressure, temperature, specific humidity, or trace gas mass fraction across the sensor.

Because the flow rate is a Through variable, the block must connect in series with the component being measured.

The relative orientation of ports A and B establishes the measurement sign. The sign is positive if flow occurs from port A to port B. Switching port connections reverses the measurement sign.

Physical signal port V outputs the volumetric flow rate through the sensor. Connect this port to a PS-Simulink Converter block to transform the output physical signal into a Simulink^® signal, for example, for plotting or additional data processing.

Ports

Output

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`V` — Mixture volumetric flow rate, m^3/s
physical signal

Physical signal output port for the mixture volumetric flow rate measurement.

Conserving

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`A` — Sensor inlet
moist air

Moist air conserving port. Volumetric flow rate is positive if air flows from port A to port B.

`B` — Sensor outlet
moist air

Moist air conserving port. Volumetric flow rate is positive if air flows from port A to port B.

Model Examples

Medical Ventilator with Lung Model

Models a positive-pressure medical ventilator system. A preset flow rate is supplied to the patient. The lungs are modeled with the Translational Mechanical Converter (MA), which converts moist air pressure into translational motion. By setting the Interface cross-sectional area to unity, displacement in the mechanical translational network becomes a proxy for volume, force becomes a proxy for pressure, spring constant becomes a proxy for respiratory elastance, and damping coefficient becomes a proxy for respiratory resistance.

Volumetric Flow Rate Sensor (MA)

Description