Abstract
Coanda effect takes place in flow within valves diffuser for certain conditions. The valve plug in half-closed position forms wall-jet, which could be stable or instable, depending on geometry and other conditions. This phenomenon was subject of experimental study using time-resolved PIV technique. For the acquired data analysis the special spatio-temporal methods have been used.
Highlights
The Coanda principle has become increasingly used in a wide variety of applications in many fields of applied dynamics of fluids – see e.g. [2]
Devices containing a jet flow employing this principle usually offer substantial flow deflection, and enhanced turbulence levels and entrainment compared with a free jet flow
Some disadvantages are connected with this phenomenon as jet flow detachment, considerable local increase of turbulence level, and appearance of quasi-periodical structures in the flowfield resulting in generation of pressure fluctuations associated with increased noise level
Summary
The Coanda principle has become increasingly used in a wide variety of applications in many fields of applied dynamics of fluids – see e.g. [2]. The Coanda principle has become increasingly used in a wide variety of applications in many fields of applied dynamics of fluids – see e.g. Devices containing a jet flow employing this principle usually offer substantial flow deflection, and enhanced turbulence levels and entrainment compared with a free jet flow. Some disadvantages are connected with this phenomenon as jet flow detachment, considerable local increase of turbulence level, and appearance of quasi-periodical structures in the flowfield resulting in generation of pressure fluctuations associated with increased noise level. The presented paper is contribution to study of the Coanda effect in some special cases which could occur in valves
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