Experiments and modeling of cavitating flows in venturi: attached sheet cavitation

Abstract

Correlated experimental and numerical studies were carried out to analyse cavitating flows and to describe the twophase flow structures of attached sheet cavitation in Venturi geometries. New double optical probe measurements were performed and special data processing methods were developed to estimate void ratio and velocity fields for cold water flows. By applying a computational method previously developed in LEGI Laboratory based on the code Fine TM /Turbo and on a barotropic approach, several steady calculations were performed in cold water cavitating flows. Local and global analyses were proposed based on comparisons between experimental and numerical results.

Characterization of the cavitating flow in converging-diverging nozzle based on experimental investigations

“…nuclei content [3]. Converging-diverging nozzle has also become a popular testcase for development of cavitation models included in CFD softwares [4][5][6] or for visualization of cavitation patterns by non-intrusive techniques [7,8]. However these experiments are based on asymmetric planar CD nozzle with rectangular cross-section.…”

Investigation of Cavitation Models for Steady and Unsteady Cavitating Flow Simulation

“…All results shown in this paper correspond to the hydrofoil at α = 6° angle of attack and subject to a nominal free stream velocity of V ∞ = 5 m/s, which yields a moderate-to-high Reynolds number of Re = V ∞ c/ν l = 0.75 × 10 6 . The density and dynamic viscosities of the liquid are taken to be ρ l = 997.1 kg/m 3 and μ l = ρ l ν l = 0.890×10 -3 Pa·s, respectively, which correspond to fresh water at 25°C.…”

“…Numerous experimental tests have been carried out for two popular cases: hydrofoils [3][4][5] and Venturi sections [6,7] to understand the physics of the cavitating flows. The characteristics of cavitation have been reported in several books and articles [8][9][10], describing various forms of cavitation where the unsteady sheet/cloud is one of the most complicated and destructive states for hydraulic machines.…”

Considerations of Impact of Venturi Effect on Mesophilic Digestion

“…Model boundary condition has been formulated as follows [18,[20][21][22]: • constant and uniform velocity v in profile in the inlet cross-section, simultaneously local level of k, and ∈ indirectly by setting turbulence intensity ε and characteristic length scale λ 2 in…”