At present, there are still few studies on the collaborative drag reduction of microgroove and surfactant in pipelines, there is still insufficient understanding of the mechanism of synergistic drag reduction between the two. In this work, the pressure drop was tested to compare the drag reduction performance of the grooved pipe on water and surfactant solution, and the turbulent structure of the flow field was analyzed by PIV system to explore the mechanism of coupling drag reduction. The microgrooves were longitudinal V-shaped grooves with three different structures, and cetyltrimethyl ammonium chloride (CTAC) was used as surfactant, and sodium salicylate (NaSal) was used as adjoint ion. The results showed that in a certain range of Reynolds number, both the wall microgroove and the surfactant solution had a drag reducing effect. The highest resistance reduction rate of water and surfactant were 6.72% and 7.12%, the highest drag reduction rate of surfactant solution was 45.14%, and the highest drag reduction ratio of coupling drag reduction was 48.26%. The drag reduction performance of the surfactant was closely related to the shear induced structure (SIS). When the critical Reynolds number was exceeded, the high shear force at the tip of the trench aggravated the damage to the SIS. The drag reduction of the microgroove on the surfactant mainly occurred in the near-wall region. By raising the average flow velocity in the near-wall region, reducing the Reynolds shear stress, and suppressing the pulsation strength of the phase velocity, the surfactant solution was provided more stable and orderly. Surfactants delayed the evolution of turbulent eddies and expanded the effective range of microgroove drag reduction. The effect of the microgroove on the drag reduction of the surfactant further improved the drag reduction rate and provided a basis for the combined drag reduction of the microgroove and the surfactant.
Entian LI Xiang HU Lianghui GUO Yang LIU Wen LIU Xiaofang Lü
. Coupling effect of microgroove and surfactant on turbulent drag reduction in a pipe flow[J]. The Chinese Journal of Process Engineering, 2019
, 19(5)
: 959
-966
.
DOI: 10.12034/j.issn.1009-606X.219112
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