|Article title||MODELING THE WATER RISE IN THE CAPILLARY IN PRESENCE OF TRANSVERSE SOLID AND PERFORATED PARTITIONS|
|Authors||I. A. Kipnis, Yu. M. Vernigorov|
|Section||SECTION II. METHODS OF DIAGNOSIS OF THE ECOLOGICAL STATE|
|Month, Year||08, 2017 @en|
|Abstract||In most publications related to the water rise in plants the structure of the xylem, which pro-vides rise and distribution of water, is not taken into account. Vessels in leafy plants are formed from porous tracheids, which affects the formation of simple or stair and averoigne perforation plates. Perforation plates are located at the ends of the vessels and connect them with each other. Partitions are rotated in space at a certain angle relative to each other. The model of water rise in a vertical capillary with transverse solid and perforated partitions is described herein for the first time. It is shown that the presence of oblique perforation of the partitions provides a large area of perforations. The angle of inclination of the perforated partitions staircase to the horizontal for different radii of the capillary is estimated and it is shown that the tilt angles are in the range from 550 to 880. The area of walls can be from 2 to 28 times greater than the cross sectional area of the capillaries, which gives the opportunity in the same proportion to increase the area occupied by the perforation and reduce the resistance in moving water. At angles of perforated partitions close to 900 the water in the capillary rises, as in a conventional capillary with an inner longitudinal vertical transparent water partition. It is shown that the different spatial orientation of baffles leads to an increase in the height of water rise in the capillary. An analytical expression for the evaluation of the influence of perforated baffles on the height of water rise in the xylem is obtained, that helps to explain the actual rise of water in deciduous trees, which in reality is many times higher than calculated by the classic formula Jurina. It is shown that with increasing the opaque area of the walls and decreasing the angle of tilt and height location relative to the water surface, height of the water rise increases. The system of partitions in the xylem of plants, like any open system, shows a property of the multiplicativity: action of each of the subsystems (each septum) is added.|
|Keywords||Plant; xylem; vessel; capillary; model.|
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