Abstract
Two turbulent jet with different sinusoidal nozzle exit configurations of in-phase and <TEX>$180^{\circ}$</TEX> out-of-phase were investigated experimentally using a smoke-wire method and a hot-wire anemometry. Mean velocity and turbulence intensity were measured at several downstream locations under <TEX>$Re_D\;=\;5000$</TEX>. For the case of in-phase nozzle configuration, the length of potential core exhibits negligible difference with respect to the transverse locations (0, <TEX>$\lambda/4$</TEX> and <TEX>$\lambda/2$</TEX>), similar to that of a plane jet. On the other hand, a maximum difference of 30% in the potential-core length occurs for the <TEX>$180^{\circ}$</TEX> out-of-phase configuration. The spatial distributions of turbulence intensities also show significant difference for the nozzle of <TEX>$180^{\circ}$</TEX> out-of-phase, whereas non-symmetric distribution is observed in the near-exit region(x/D = 1) for the in-phase sinusoidal nozzle jet. Compared to a slit planc jet, the sinusoidal nozzle jets seem to suppress the velocity deficit as the flow goes downstream. The sinusoidal nozzle jet was found to decrease turbulent intensity dramatically. The flow visualization results show that the flow characteristics of the sinusoidal nozzle jet are quite different from those of the slit plane jet.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
