Formation of Coanda jet from sharp-edged swirl nozzle with base plate

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.01.008· OSTI ID:21169008

Singh, Nil Kanth; Ramamurthi, K ^[1]

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1. Department of Mechanical Engineering, Indian Institute of Technology Madras, Thermodynamics and Combustion Laboratory, Chennai 600036 (India)

Experiments were conducted using tufts and PIV to determine the conditions for which a swirled gas jet issuing from a sharp-edge nozzle, in flush with a base plate, would form a Coanda jet. The flow field was also simulated. The inception of the Coanda jet was observed to be associated with the formation of a recirculation bubble at the nozzle exit. A threshold value of swirl number, which increased monotonically with Reynolds number, was required for the formation of the Coanda jet. The Coanda jet was associated with hysteresis. The flow features and transition from a diverging jet to a Coanda jet are discussed. (author)

• OSTI ID: 21169008
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 4 Vol. 33; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BUBBLES
COMBUSTORS
Coanda jet
HYSTERESIS
JETS
NOZZLES
PLATES
REYNOLDS NUMBER
Recirculation
SIMULATION
Swirl nozzles
Tufts