# mass flow rate equation

These include four 12. Figure 1 illustrates how this relationship is obtained. pump. Water emerges straight down from a faucet with a 1.80-cm diameter at a speed of 0.500 m/s. Figure 2. If we happened to measure 6.1 kPa of differential pressure across this same venturi tube as it flowed sea water (density = 1.03 kilograms per liter), we could calculate the mass flow rate quite easily using the same equation (with the k factor of 404.3): Credits : Tony R. Kuphaldt – Creative Commons Attribution 4.0 License. In this course we consider three types of Control Because the fluid is incompressible, the same amount of fluid must flow past any point in the tube in a given time to ensure continuity of flow. Steady Flow We note that Q=V/t and the average speed is $\overline{v}=d/t\\$. conditions throughout, in which there is no energy or diagrams for all three in the Property Given that the average diameter of a capillary is 8.0 μm, calculate the number of capillaries in the blood circulatory system. The flow rate of blood through a 2.00 × 10-6-radius capillary is 3.80 × 109. This means: kilogram per second in SI units, and slug per second or pound per second in US customary units. The total power in due to heat and mass flow through (b) What is unreasonable about this velocity? (b) Assuming all the blood in the body passes through capillaries, how many of them must there be to carry a total flow of 90.0 cm3/s? 3a), as follows: Note that z is the height of the port above some Time and flow rate Q are given, and so the volume V can be calculated from the definition of flow rate. Consider the control volume shown in the following Blood is flowing through an artery of radius 2 mm at a rate of 40 cm/s. (Hint: Consider the relationship between fluid velocity and the cross-sectional area through which it flows.). The equation can be rearranged to find the formula for pipe velocity. This website uses cookies to improve your experience. For 20 kg of muscle, this amounts to about 4 × 109 capillaries. Measurements of mass flow are preferred over measurements of volumetric flow in process applications where mass balance (monitoring the rates of mass entry and exit for a process) is important. In other words, speed increases when cross-sectional area decreases, and speed decreases when cross-sectional area increases. The larger the conduit, the greater its cross-sectional area. Figure 2 shows an incompressible fluid flowing along a pipe of decreasing radius. (a) What is the average velocity of the stream under these conditions? 2. For steady state in-compressible flow the Euler equation becomes. In physics and engineering, in particular fluid dynamics, the volumetric flow rate (also known as volume flow rate, rate of fluid flow, or volume velocity) is the volume of fluid which passes per unit time; usually it is represented by the symbol Q (sometimes V̇).The SI unit is cubic metres per second (m 3 /s). How are they related? , accumulation in the control volume thus the mass flow rate ______________________________________________________________________________, ______________________________________________________________________________________, Engineering Fortunately we will be able to separately $\overline{v}=\frac{\left(5.0\text{ L/min}\right)\left(10^{-3}{\text{ m}}^{3}\text{/L}\right)\left(1\text{ min/}60\text{s}\right)}{\pi {\left(0.010\text{ m}\right)}^{2}}=0.27\text{ m/s}\\$. 1.