What is mass flow of water?
Mass flow, also known as “mass transfer” and “bulk flow”, is the movement of fluids down a pressure or temperature gradient, particularly in the life sciences. Examples of mass flow include blood circulation and transport of water in vascular plant tissues.
What is the role of water in the mass flow?
Abstract. Water plays an important role in causing mass movement processes. In dynamic groundwater systems, the water flow creates a drag force on the soil particles resulting in seepage pressure on these particles.
Does water travel by bulk flow?
Water and solutes move through xylem vessels and sieve tubes by bulk flow, the movement of a fluid driven by pressure.
What is the process of mass flow?
Mass flow is the movement of dissolved nutrients into a plant as the plant absorbs water for transpiration. The process is responsible for most transport of nitrate, sulfate, calcium and magnesium. The root then absorbs the nutrients.
Why mass flow rate is important?
Direct mass flow measurement is an important development across industry as it eliminates inaccuracies caused by the physical properties of the fluid, not least being the difference between mass flow and volumetric flow. Mass is not affected by changing temperature and pressure.
Why does mass flow occur?
The narrowness of the tubes and the existence of plates help to produce pressure differences between different areas of the phloem and to stimulate a vast movement of materials from one place to another. This is known as mass flow. The sucrose produced in the leaf cells is actively transported into the phloem cells.
What is bulk mass flow?
Mass flow or bulk flow is the movement down a pressure gradient ( a pressure gradient in plants is observed due to variations in solute concentration) or temperature gradient of substances in bulk or in masses. Xylem and phloem in plants play a similar role as veins and arteries in animals.
How to calculate mass flow rate of air?
Calculate Mass Flow Rate of Air / Liquid. kg/hour. Mass Flow rate refers to the mass flow or movement of the mass of the substance passing per unit of time. It is expressed as kilogram per second in SI units and pound per second in customary units.
Which is more important air leakage or water vapor migration?
Although vapor flow resulting from air leakage is many orders of magnitude greater than vapor flow through diffusion, this course will concentrate on vapor movement that occurs by water vapor diffusion, which is still an important element in building enclosure design even though it has taken a back seat to air leakage in recent years.
How does the direction of water vapor flow?
Click image to enlarge. For typical buildings, water vapor flows from the warmer side to the colder side of an enclosure system. This means that the direction of water vapor flow will vary by season and sometimes even on a daily basis, depending on the local climate.
What happens to air flow when it meets an object?
The rougher or more obstructive the object, the more turbulent the air flow becomes, the greater the friction between the layers, and the greater the drag. At low speeds, the air flows splits when it meets an object and, providing the object is reasonably aerodynamic, flows right around it, closely following its outline.
