Turbulent flows of viscoplastic fluids at high Reynolds numbers have been investigated recently with direct numerical simulations (DNS) but experimental results limited. For this reason, we carry out an study fully turbulent a yield stress fluid in rectangular aspect ratio channel high-resolution laser doppler velocimetry (LDA) setup. We employ aqueous Carbopol solutions, often considered to be...

The sound attenuation of a silencer consisting lamella network made with melamine foam inserted in rectangular duct is investigated numerically and experimentally. arrangement designed so that skeleton bending elastic resonances appear at low frequency. In addition to this phenomenon, viscothermal losses the porous material ensure broadband attenuation. provides natural sub-wavelength resonator...

In this work, the exact analytic solutions for some unsteady oscillating flows of an incompressible Burgers' fluid in a duct of rectangular cross-section are considered. Here, two types of flows, namely, (1) flow due to the oscillating pressure gradient, and (2) flow due to the oscillation of duct parallel to its length, were considered. The exact analytical expressions for the velocity field a...

r SUMMARY The tests were made in the jft x jft tunnel to assess the performance of a rectangular twin-duct intake, including effeots of limited immersion of the intake xnto a wing boundary layer. The effects in one duct, arising from interference caused by varying the flow through the other, have slso been mvestigated. Partial immersion of the lntske into the wing boundary layer causes little d...