Comparison of CFD simulations and measurements of flow affected by coanda effect

Abstract

Simple example of CE is a jet blowing over convex surface. The jet could attach to the surface depending on geometrical configuration and character of the flow. Many practical applications involve near wall flows, and often in these applications of wall jets, the jet is injected at an angle to a solid boundary. Such examples can be seen in aircraft industry, energy devices (film cooling of turbine blades, gas turbine combustion chamber walls, jet exhausters, spraying devices, etc.) and many other areas. All of these devices have something in common; they were created using experimental research to assure their functionality. Design optimization is the only possible solution nowadays, as there is no proper theory to predict the CE. Finding universal description for such extensive problem cannot be expected, but there are some expectations to discover basic principles [1]. Our department is mainly focused on reduction of energy demand and improvement of functionality in devices for air conditioning and ventilation in buildings and vehicles. Particularly local ventilation in small spaces can be unpredictable because of air jet interaction with surfaces. Improvement and better control of CE for better distribution of air into the room can be made based on an analysis of wall jet physics character. Enhanced interior aerodynamics in vehicle cabs is important motivation for study of effect of different factors on the CE. This article is focused on experimental and CFD investigation of behaviour of a jet which is travelling around surface. The main goal was describe the influence of surface geometry and properties of jet on Coanda effect formation.

Control of temperature and fume generation by cooking in a residential kitchen by ceiling radiative cooling and fume hood extraction

“…The fan coil provides a low temperature airflow at a certain speed, due to Coanda effect. 41–46 The cold airflow would transfer heat from the under surface of the aluminium board to allow cooling of the indoor environment to a lower temperature. The low-temperature aluminium plate would then transfer heat by radiation and convection in the kitchen environment.…”

Effect of air flow rates on concurrent supply and exhaust kitchen ventilation system

“…Coanda effect is known as a flow that is attached to the wall as a result of low pressure distribution along the wall. [40][41][42][43][44] Due to air flow, the pressure between the flow stream and the ceiling wall is lowered and this low pressure makes the flow attached to the ceiling wall. This air blocks the contaminated air from entering the inner part of the space.…”