Gas Flow Rate
Gas Flow Rate - Related Videos
02:54
Noble Gases
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2020
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false. These elements are present in the atmosphere in small amounts. Some natural gas contains 1–2% helium by mass. Helium is isolated from natural gas by liquefying the condensable components,...
02:26
Molecular Comparison of Gases, Liquids, and Solids
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2020
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
13:35
Mass Conservation and Flow Rate Measurements
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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...
01:29
Perfect Gases and the First Law
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2026
A perfect gas obeys the equation of state pV = nRT. The internal energy of a perfect gas remains unaffected by volume alterations. Therefore, the internal energy of a perfect gas is solely dependent on temperature.Consider an ideal gas enclosed in a cylinder situated within a substantial constant-temperature bath. In an isothermal process, where the temperature remains constant, the change in internal energy equates to zero. Thus, according to the first law of thermodynamics, heat absorbed (q)...
03:03
Mixtures of Gases: Dalton's Law of Partial Pressures and Mole Fractions
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2020
Unless individual gases chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each gas in a mixture exerts the same pressure that it would exert if it were present alone in the container. The pressure exerted by each individual gas in a mixture is called its partial pressure. This means that in a mixture containing three different gases A, B, and C, if PA is the partial pressure of gas A; PB is the partial pressure of gas B; PC is the...
FAQs
Choosing between volumetric and mass flow rate depends on what the engineering calculation must represent. Volumetric flow describes gas volume under stated conditions, whereas mass flow tracks the amount of gas independent of that volume expression. Because pressure, temperature, and gas properties affect volume, engineers must specify operating conditions when comparing measurements or designing equipment.
Pressure and temperature are not merely reporting details; they can change the measured value of gas flow rate. A gas stream may show a different volumetric result when its operating conditions change, even when the same gas is involved. Engineers therefore interpret readings alongside pressure, temperature, gas properties, and flow conditions rather than treating one value as universal.
Measurement devices rely on different physical responses. A rotameter responds to changes related to gas velocity, an orifice plate uses a pressure-related effect, and a mass flow controller uses a thermal response while also regulating the stream. Selecting among them depends on whether the task is to determine flow, control it, or support a specific operating condition.
A practical selection begins by identifying whether the system needs measurement, regulation, or both. Engineers then consider gas properties, pressure and temperature conditions, flow behavior, and the instrument's role in the equipment. Rotameters and orifice plates can determine flow, while mass flow controllers can regulate it, making selection part of system design rather than an isolated decision.
Gas flow rate enters equipment design by linking required gas movement to the capacity of pipelines, compressors, ventilation systems, and chemical-processing equipment. Engineers use the relevant flow expression together with operating conditions to size or configure these systems. Matching the specified rate to actual conditions helps support process stability, efficient operation, emissions management, and safe performance.
Accurate control of gas flow rate supports several engineering goals at once. Stable flow helps maintain process stability, while appropriate control can improve energy efficiency and contribute to emissions management. In systems where gas movement affects operating conditions, dependable measurement or regulation also supports safe operation and provides a basis for meeting changing process requirements.