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Title of Journal: J Mech Sci Technol

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Abbravation: Journal of Mechanical Science and Technology

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Publisher

Korean Society of Mechanical Engineers

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DOI

10.1007/bf01982477

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ISSN

1976-3824

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Jet flow characteristics of sinusoidal wavy nozzle

Authors: SangJoon Lee HakLim Kim JinPyung Lee Sundara Rajagopalan
Publish Date: 2013/01/13
Volume: 26, Issue: 12, Pages: 4007-4016
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Abstract

The flow characteristics of jets issued from a sinusoidal nozzle with inphase and 180° outofphase exit configurations were investigated using PIV particle image velocimetry and flow visualization techniques The experiments were carried out at a Reynolds number of about 6300 based on the mean width of the jet nozzle Compared to a normal rectangular jet the sinusoidal nozzle jets have smaller velocity deficits as the flow goes downstream In addition the turbulence intensity is suppressed in the horizontal center plane For the case of inphase wavy nozzle jet the length of the potential core exhibits small variations along the lateral direction while the 180° outofphase wavy nozzle jet shows large lateral variation in the length of potential core The turbulent kinetic energy of the 180° outofphase nozzle jet also shows sinusoidal variation in the horizontal planes Largescale vortices shed from the sinusoidal edge of the nozzle interact strongly and migrate toward the center plane as the flow develops downstreamSangJoon Lee received the MS and PhD degrees in Mechanical Engineering from KAIST in 1982 and 1986 He is a professor in the Department of Mechanical Engineering at POSTECH since 1987 His research interests are quantitative flow visualization PIV Holography Xray imaging experimental fluid mechanics bluff body aerodynamics microfluidics and biofluid flowsHak Lim Kim received the BS in Mechanical Engineering from Hongik University in 2008 and MS in Mechanical Engineering from POSTECH in 2010 respectively He is in working at HYUNDAI motors His research interests are flow visualization applications of PIV velocity field techniques and aerodynamics

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