Effect of Coanda nozzle clearance on the flow characteristics of air amplifier

Author

Lee, J.M. ; Cho, M.Y. ; Hong, C.K. ; Yoon, S.M. ; Kim, H.S. ; Kim, Y.-J.

Author_Institution

Grad. Sch. of Mech. Eng., Sungkyunkwan Univ., Suwon, South Korea

fYear

2014

Firstpage

1

Lastpage

6

Abstract

An air amplifier makes air flow increased by ejecting a small amount of air, which results in the Coanda effect: A tendency of keeping fluids attached to an adjacent surface while the air flow is passing along the wall boundary. In this paper, the flow characteristics of an air amplifier were investigated with various flow and geometrical conditions. In particular, various values of the Coanda nozzle clearance (δ = 0.1, 0.2, 0.3, 0.4, and 0.5 mm), diffuser angles (α = 15°, 20°, 25°), and pressure conditions (p_c = 0.1, 0.2, 0.3, and 0.4 MPa) were considered. Numerical analysis was performed using a commercial CFD code, ANSYS CFX 14.5 with the shear stress transport (SST) turbulent model. The results of pressure and velocity distributions were graphically depicted with various operating conditions.

Keywords

aerodynamics; computational fluid dynamics; confined flow; finite element analysis; nozzles; shear turbulence; ANSYS CFX 14.5; Coanda nozzle clearance effect; SST turbulent model; air amplifier; air flow; commercial CFD code; diffuser angles; flow characteristics; flow condition; geometrical conditions; numerical analysis; pressure condition; pressure distributions; shear stress transport turbulent model; velocity distributions; wall boundary; Air Amplifier; CFD (Computational Fluid Dynamics); Coanda Effect; Diffuser;

fLanguage

English

Publisher

iet

Conference_Titel

Fluid Machinery and Fluid Engineering, 2014 ISFMFE - 6th International Symposium on

Print_ISBN

978-1-84919-907-0

Type

conf

DOI

10.1049/cp.2014.1207

Filename

7124128