PIV investigation of cavitating flows around circular cylinders with hydrophobic coatings
نویسندگان
چکیده
The treatment of the hydrophobic properties solid surfaces is considered as a passive method to reduce drag in water flows (Rothstein, 2010) and potentially affect flow separation vortex shedding (Sooraj et al., 2020). manufacturing with micro- nano-scale roughness allows extend hydrophobicity towards superhydrophobicity contact angle close 180°. In such conditions surface not wetted completely air-water interphase partially remains on texture. This results so-called slip effect. Therefore, local phase transition during cavitation or gas effervescence near-wall low-pressure regions may additionally effect for surfaces. present work focused comparison between cavitating noncavitating around circular cylinders lateral sectors non-hydrophobic coatings. experiments are performed tunnel, which consists outgassing cooling/heating section, honeycomb, contraction test section diffuser. driven by an electric pump, providing bulk velocity up 10 m/s transparent 1 m length 80×150 mm2 rectangular cross-section. facility equipped ultrasonic flowmeter, temperature pressure sensors. Besides, static inside tunnel can be varied using special shaft section. measurements high-repetition low-repetition PIV systems. former used analysis large-scale dynamics wake region, whereas latter one high-resolution long-distance microscope. Reynolds number based flow, diameter (D = 26 mm) kinematic viscosity 2×105..
منابع مشابه
High-speed Imaging and Piv Measurements in Turbulent Cavitating Flows around 2d Hydrofoils
The paper reports on high-speed imaging and PIV study of cavitating flows around a flat plate with semicircular leading edge and a NACA0015 hydrofoil. Both foils were investigated at a series of attack angles ranging from 0 to 9° with varying cavitation number. Several known types of cavitation common to both foils, but also some different patterns, were registered. At small angles of incidence...
متن کاملA Numerical Investigation of Unsteady Bubbly Cavitating Nozzle Flows
The effects of unsteady bubble dynamics on cavitating flow through a converging-diverging nozzle are investigated numerically. A continuum model that couples the Rayleigh–Plesset equation with the continuity and momentum equations is used to formulate unsteady, quasi-one-dimensional partial differential equations. Flow regimes studied include those where steady-state solutions exist, and those ...
متن کاملInvestigation of vortex-induced vibration phenomenon in verticallong circular slender structure with non-uniform flows
Analyzing the vortex-induced vibration of a slender marine structure withlength to diameter ratio up to 200 is the objective of this study. This slender is free to move in both in-line and cross flow directions and immersed completely in water. Three different types of shear currents pass on it and cause to vibrate slender in different forms. Nowadays, these vibrations are very important for de...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Symposium on Particle Image Velocimetry
سال: 2021
ISSN: ['2769-7576']
DOI: https://doi.org/10.18409/ispiv.v1i1.101