This paper deals with active control of a continuous jet issuing from long pipe nozzle by means concentrically placed annular synthetic jet. The experiments in air cover regimes laminar, transitional, and turbulent main flows (Reynolds number ranges 1082–5181). velocity profiles (time-mean fluctuation components) unforced forced jets were measured using hot-wire anemometry. Six flow are disting...

The character of transitional capillary flow is investigated using pressure-drop measurements and instantaneous velocity fields acquired by microscopic PIV in the streamwise–wall-normal plane of a 536 lm capillary over the Reynolds-number range 1,800 £ Re £ 3,400 in increments of 100. The pressure-drop measurements reveal a deviation from laminar behavior at Re = 1,900 with the differences betw...

The transitional free convection flow and heat transfer within attics in cold climate are investigated using 3-D numerical simulations for a range of Rayleigh numbers from 103 to 106 height-length ratios 0.1 1.5. development process the attic could be classified into three-stages: an initial stage, fully developed stage. Flow structures different stages including transverse longitudinal rolls c...