masseflow

Masseflow is a term used to describe the rate at which mass passes through a cross-section of a flowing substance per unit time. In English, the standard term is mass flow (or mass flow rate), commonly denoted by ṁ and measured in kilograms per second (kg/s). For a liquid or gas with density ρ, the mass flow rate is related to the volumetric flow rate Q by the equation ṁ = ρQ. In compressible flows, such as those involving gases, density can vary with pressure and temperature, so ṁ may remain constant even as Q changes.

Measuring masseflow can be done directly or indirectly. Direct methods use mass flow meters, with Coriolis meters being a prominent example that measures mass flow by detecting the deflection of a vibrating tube. Indirect methods determine volumetric flow and convert to mass flow using density, employing devices such as orifice plates, venturi tubes, turbine meters, or magnetic flow meters for conductive liquids. For gases, thermal mass flow meters and ultrasonic meters are common, often providing accurate mass flow readings across a range of pressures and temperatures.

Applications of masseflow measurements span many industries. In engines and fuel systems, precise mass flow control improves efficiency and emissions. In chemical processing and pharmaceuticals, accurate dosing of reactants depends on mass flow accuracy. HVAC systems monitor and control air and fluid flows, while aerospace and rocket propulsion rely on stringent mass flow measurements to ensure performance and safety.

Note: masseflow is often used as a variant spelling or translation of mass flow in non-English sources or as a brand name. In most technical contexts, mass flow rate is the preferred term. See also: mass flow rate, continuity equation, compressible flow.