Laminar-to-turbulent flow transition under the action of acoustic oscillations

Shelpyakov, A. N.; Kasimov, A. M.; Isupov, G. P.

doi:10.1007/bf00827078

Cited by 1 publication

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Koller-Milojevic and Schneider (9) reported that low-Reynolds-number jets are momentarily disturbed even by the sound of a person's handclap. Shel'pyakov et al (10) showed that a laminar free-jet is divided into two conical flows under the condition of acoustic sound addition. Thus, in the present study, the effects of cyclic perturbation on the flow and mixing characteristics of multiple jets are studied from an experimental approach.…”

Section: Introductionmentioning

confidence: 99%

Mixing Characteristics of Multijet Modified by Cyclic Perturbation

Tatsumi

Shinohara

Okamoto

et al. 2006

JSME international journal. Ser. B, Fluids and thermal engineer

View full text Add to dashboard Cite

The effect of cyclic perturbation on the mixing performance of millimeter-sized multiple air jets was investigated using flow visualization, hot-wire anemometry and laser Doppler anemometry techniques. Two types of external perturbation method were used, i.e., adding an acoustic sound and applying a pulsating flow to the jet. External acoustic sounds were found to be an additional dominant factor for the jet mixing, and in the multiple-jet case, the main jet located in the middle between the two same-sized jets was split into two, entrained into the neighboring jets, and eventually merged into one developed flow. For the pulsating-jet case, depending on the phase in one cycle, the jet flow condition alternately changed between laminar and turbulent. This affected the time-mean values of the jet flow profile. An adverse change in the mixing performance at the locations near the nozzle and far downstream was obtained between the pulsating-and steady-jet cases.

show abstract

Section: Introductionmentioning

confidence: 99%