Mass flow rate

﻿
Mass flow rate

Mass flow rate is the mass of substance which passes through a given surface per unit time. Its unit is mass divided by time, so kilogram per second in SI units, and slug per second or pound per second in US customary units. It is usually represented by the symbol $\dot m$.

Mass flow rate can be calculated from the density of the substance, the cross sectional area through which the substance is flowing, and its velocity relative to the area of interest.

$\dot m = \rho \, v \, A$

where:

${\dot m}$ is the mass flow rate
ρ is the density
v is the velocity
A is the flow area

This is equivalent to multiplying the volumetric flow rate by the density.

${\dot m} = {\rho \cdot Q}$

where:

ρ is the density
Q is the volumetric flow rate

The symbol for mass flow rate in Newton's notation for a derivative is as follows:

$\dot m = \frac{dm}{dt}$

Wikimedia Foundation. 2010.

Look at other dictionaries:

• mass flow-rate — masės srautas statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. mass flow rate vok. Massendurchfluss, m; Massenfluss, m; Massenstrom, m rus. массовый поток, m;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• mass flow-rate — masės srautas statusas T sritis Standartizacija ir metrologija apibrėžtis Srautas, išreiškiamas skysčio arba dujų mase per vienetinį laiko tarpą. atitikmenys: angl. mass flow rate vok. Massendurchfluss, m; Massenfluss, m; Massenstrom, m rus.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• mass flow rate — masės srautas statusas T sritis Energetika apibrėžtis Paviršių kertančios medžiagos masė, padalyta iš laiko tarpo. atitikmenys: angl. mass flow rate vok. Massendurchfluß, m; Massenstrom, m rus. массовый поток, m; поток массы, m pranc. débit en… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

• mass flow rate — masės srautas statusas T sritis Energetika apibrėžtis Srautas, išreiškiamas skysčio ar dujų mase per vienetinį laiko tarpą. atitikmenys: angl. mass flow rate vok. Massendurchfluß, m; Mssenstrom, m rus. массовый поток, m; поток массы, m pranc.… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

• Mass flow meter — A mass flow meter A mass flow meter, also known as an inertial flow meter is a device that measures mass flow rate of a fluid traveling through a tube. The mass flow rate is the mass of the fluid traveling past a fixed point per unit time. The… …   Wikipedia

• Mass flow sensor — A mass airflow sensor. A mass air flow sensor is used to find out the mass flowrate of air entering a fuel injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the… …   Wikipedia

• Mass flow — Mass flow, also known as mass transfer and bulk flow, is the movement of material matter. In physics, mass flow occurs in open systems and is often measured as occurring when moving across a certain boundary characterized by its cross sectional… …   Wikipedia

• Mass flow controller — A mass flow controller A mass flow controller (MFC) is a device used to measure and control the flow of fluids and gases. A mass flow controller is designed and calibrated to control a specific type of fluid or gas at a particular range of flow… …   Wikipedia

• Volumetric flow rate — The volumetric flow rate in fluid dynamics and hydrometry, (also known as volume flow rate or rate of fluid flow) is the volume of fluid which passes through a given surface per unit time (for example cubic meters per second [m3 s 1] in SI units …   Wikipedia

• Flow measurement — is the quantification of bulk fluid movement. Flow can be measured in a variety of ways. Positive displacement flow meters acumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow. Other flow… …   Wikipedia