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An experimental study of the circular internal hydraulic jump (CROSBI ID 541189)

Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija

Kavčič, Iva An experimental study of the circular internal hydraulic jump // Geophysical Fluid Dynamics Program Notes (Course Lectures and Fellows Project Reports) / Cenedese, Claudia ; Whitehead, John A. ; Pedlosky, Joseph et al. (ur.). Woods Hole (MA): Woods Hole Oceanographic Institution, 2008. str. 244-263

Podaci o odgovornosti

Kavčič, Iva

engleski

An experimental study of the circular internal hydraulic jump

The results of an experimental investigation of the circular internal hydraulic jump in two-layer fluid are presented, with focus on the dependence on the flow rates and density differences between fresh and salty water used. For the lower flow rates the stable circular patterns, consisted of three or four well-formed stationary waves, were observed, while for the higher flow rates their axial symmetry was lost by deformation of entire wave pattern in cusp-like features. This stable, laminar regime lasted 4-5 minutes, after which instabilities started to develop, finally breaking the wave patterns in turbulent motion. The radii of stationary waves were measured, and the depths of the fluid inside and outside the jump were calculated in order to find the critical values of jump radius, fluid depth and Froude number just before the onset of instabilities. While the values of jump radius, fluid depth and Froude number inside the jump (reaching values of up to 12-14) strongly depend on variations in flow rate and density difference, this dependence does not seem to be so strong for the Froude number outside the jump. Their values are below 1, due to dispersion relation for the internal waves in two-layer fluid used to calculate the fluid depth outside the jump. Comparison of results with the analytic Watson’ s (1964) model for the jump in the single-layer flow indicates the existence of similar functional dependence for the two-layer fluid. Finally, the experiments where the sharp density difference was smoothed by diffusion indicate that the stationary, laminar waves cannot occur in a continuously stratified fluid.

Hydraulic jump; Stationary waves; Stratified fluid

Bibliografska referenca: WHOI-2008-05

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Podaci o prilogu

244-263.

2008.

objavljeno

Podaci o matičnoj publikaciji

Geophysical Fluid Dynamics Program Notes (Course Lectures and Fellows Project Reports)

Cenedese, Claudia ; Whitehead, John A. ; Pedlosky, Joseph ; Lentz, Steven

Woods Hole (MA): Woods Hole Oceanographic Institution

Podaci o skupu

Nepoznat skup

predavanje

29.02.1904-29.02.2096

Povezanost rada

Fizika, Geologija, Matematika

Poveznice