Naslov
An experimental study of the circular internal hydraulic jump

Autori
Kavčič, Iva

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
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, 2008, 244-263

Skup
Geophysical Fluid Dynamics Program (2007 Program of Study: Boundary Layers)

Mjesto i datum
Falmouth (MA) , Sjedinjene Američke Države, 18.06.2007. - 24.08.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Hydraulic jump; Stationary waves; Stratified fluid

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Matematika, Fizika, Geologija

Napomena
Bibliografska referenca: WHOI-2008-05

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