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method). The functional diagrams allow obtaining the graphical
representation of the level of the liquid from the reservoir during the
time of the emptying process but also the graphical representation of
the flow rate of the liquid through the orifice. Using the measured
values of flow rate, the velocity and the Reynolds number can be
calculated. A comparative analysis of the numerical results for the
emptying time for constant head and for variable head reservoirs,
obtained with the analytical and the functional diagram methods
will be presented.
Key words: constant cross-sectional area reservoir, emptying
time, emptying orifice, functional diagram, MATLAB.
FUNCTIONAL DIAGRAMS FOR MODELING THE RESERVOIR
EMPTYING PROCESS THROUGH AN EMPTYING PIPE
by
DĂNUŢ ZAHARIEA
Abstract. In this paper the emptying process of constant head
and variable head reservoirs with constant cross-sectional area
through an emptying pipe will be investigated. The pressure at the
water surface and also the velocity of this surface, as well as the
head loss due to friction along the emptying pipe will be considered.
Two methods will be presented: the analytical method based on the
fundamental equations governing the reservoir emptying process
and the functional diagrams method based on MATLAB/Simscape
computational approach suited to analyze the real physical systems.
A comparative analysis of the numerical results for the emptying
time for constant head and for variable head reservoirs, obtained
with the analytical and the functional diagram methods will be
presented.
Key words: constant cross-sectional area reservoir, emptying
time, emptying pipe, functional diagram, MATLAB.
A PLEADING FOR THE MODERNIZATION OF
MACHINE TOOLS IN NATIONAL INDUSTRY
by
DAN POPESCU