mass flow

an hypothesis to explain the movement of solutes in a plant by means of a hydrostatic pressure gradient. The idea is that in one part of the plant (the source) solute particles are actively secreted into sieve cells of PHLOEM, producing a high osmotic concentration which attracts water by OSMOSIS. In another part of the plant (the sink) solute particles are leaving the phloem, thus lowering the osmotic concentration which causes water to leave also. There is, therefore, a pressure gradient set up between the source (e.g. leaf) and the sink (e.g. root) and fluids flow from one to the other, down the gradient. See TRANSLOCATION (1).

单词	mass flow
释义	DictionarySeeconvection mass flow mass flow [′mas ′flō] (engineering) A pattern of powder flow occurring in hoppers that is characterized by the powder flowing at every point, including points adjacent to the hopper wall. (fluid mechanics) The mass of a fluid in motion which crosses a given area in a unit time. mass flow mass flow an hypothesis to explain the movement of solutes in a plant by means of a hydrostatic pressure gradient. The idea is that in one part of the plant (the source) solute particles are actively secreted into sieve cells of PHLOEM, producing a high osmotic concentration which attracts water by OSMOSIS. In another part of the plant (the sink) solute particles are leaving the phloem, thus lowering the osmotic concentration which causes water to leave also. There is, therefore, a pressure gradient set up between the source (e.g. leaf) and the sink (e.g. root) and fluids flow from one to the other, down the gradient. See TRANSLOCATION (1).
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