Florentina BUNEA


25-60 VARIAŢIA COEFICIENTULUI DE DEBIT LA ORIFICII MICI CU VÂSCOZITATEA ŞI TENSIUNEA SUPERFICIALĂ

THE VARIATION OF SMALL ORIFICES DISCHARGE
WITH VISCOSITY AND SUPERFICIAL TENSION
This paper presents a synthesis of theoretical and experimental
results concerning the discharge coefficient of hydraulic orifices and its
dependence on Reynolds number for the case of fluids with known physical
properties. The experimental researches performed in laboratory emphasize
the influence of superficial tension and viscosity on the discharge through a
small orifice of 3 mm diameter. For the investigated range of superficial
tensions and viscosities (σ = (23 ÷ 80) ·10-3 N/m and η = (1.1 ÷ 910)·10-3 Pa·s),
there was found a linear dependence of discharge on lg Re and lg100We.
Keywords: orifice, discharge coefficient, superficial tension, viscosity
Cuvinte cheie: orificii, coeficient de debit, tensiune superficială,
vâscozitate
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