Mass Flow Controller
Mass Flow Controller - Related Videos
13:35
Mass Conservation and Flow Rate Measurements
0 Views •
2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI The purpose of this experiment is to demonstrate the calibration of a flow passage as a flowmeter using a control volume (CV) formulation [1, 2]. The CV analysis focuses on the macroscopic effect of flow on engineering systems, rather than the detailed description that could be achieved with a detailed differential analysis. These two techniques should be...
01:30
Control of Power Flow
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2024
There are several methods to control power flow in power systems: Prime mover and excitation control of generators Switching of shunt capacitor banks, shunt reactors, and static var systems Control of tap-changing and regulating transformers A simple generator in the system is represented by its Thevenin equivalent circuit, which represents its model operating under balanced steady-state conditions. The key parameters include the generator terminal voltage Vt, the excitation voltage Eg,...
01:07
Conservation of Mass in Fixed, Nondeforming Control Volume
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2025
The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it. In the case of a sewer pipe, which can be modeled...
01:14
Conservation of Mass in Moving, Nondeforming Control Volume
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2025
Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage. In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
07:22
Quality-Controlled Sputum Analysis by Flow Cytometry
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Cited by 5 •
2021
This protocol describes an efficient method for dissociating sputum into a single cell suspension and the subsequent characterization of cellular subsets on standard flow cytometric platforms.
FAQs
In gas service, a thermal sensor detects heat transfer across the flow channel. The resulting measurement is compared with the programmed set point, and feedback directs the control valve to adjust delivery. This measurement-and-correction cycle allows the system to compensate for deviations and maintain a more consistent gas flow during bioengineering experiments.
Feedback control links the measured flow rate to valve adjustment rather than relying only on a preset valve position. When the measured value differs from the target, the controller changes gas delivery toward the programmed set point. This active correction helps stabilize conditions that influence oxygen availability, carbon dioxide exposure, pressure, and other process variables.
Inaccurate delivery can alter the gas conditions experienced by a biological system, with consequences for pH, metabolism, pressure, and cell growth. Because these variables are interconnected with experimental performance, unstable flow may reduce reproducibility and make it harder to determine whether observed changes arise from the intended treatment or from uncontrolled gas delivery.
A basic workflow is to select the required gas or liquid stream, program the desired flow set point, and allow the controller to measure and regulate delivery through its feedback loop. The regulated stream is then supplied to the relevant platform, such as a bioreactor or cell culture system, while process conditions are maintained and experimental responses are monitored.
They are used in bioreactors, cell culture systems, tissue-engineering platforms, and analytical instruments. In these settings, controlled delivery of oxygen, carbon dioxide, nitrogen, or other gases helps establish defined process conditions. The same principle supports experiments focused on cell growth, metabolism, pH control, pressure management, or reproducible analytical measurements.
Precise delivery reduces variation in the environmental conditions surrounding cells, tissues, or biological reactions. When oxygen, carbon dioxide, nitrogen, or another gas is regulated consistently, researchers can better connect experimental outcomes with the intended design. This improves process stability and reproducibility, making comparisons among runs more meaningful and reducing uncertainty caused by uncontrolled flow changes.