Experimental Study on the Collaborative Drag Reduction of Surfactant and Longitudinal Microgrooves

doi:10.7652/xjtuxb201903021

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Experimental Study on the Collaborative Drag Reduction of Surfactant and Longitudinal Microgrooves

更新时间：2025-07-09

- Experimental Study on the Collaborative Drag Reduction of Surfactant and Longitudinal Microgrooves
- Vol. 53, Issue 3, Pages: 150-156(2019)
- 作者机构：
  
  武汉第二船舶设计研究所热能动力技术重点实验室,武汉,430205
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201903021
  CLC： TH132.44
- Online First：10 March 2019，
  
  Published：2019
- 稿件说明：
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Experimental Study on the Collaborative Drag Reduction of Surfactant and Longitudinal Microgrooves[J]. 2019, 53(3): 150-156.
DOI：

Experimental Study on the Collaborative Drag Reduction of Surfactant and Longitudinal Microgrooves[J]. 2019, 53(3): 150-156. DOI： 10.7652/xjtuxb201903021.

摘要

根据表面活性剂溶液发生减阻时可放大近壁湍流涡尺度的特性

以及纵向微沟槽通过约束近壁流向涡运动实现减阻的机理

指出了两者在减阻机理上存在互补的可能性

并对两者的协同减阻性能进行实验研究验证

分析两者的协同强化减阻机理。通过研究0.22 mmol/L表面活性剂CTAC/NaSal溶液在两种不同尺寸的纵向壁面微沟槽通道内的变温度协同减阻性能

发现20 ℃时溶液能在纵向微沟槽的作用下强化减阻性能

最大减阻率从光滑通道的66%分别增大到G1沟槽的71%和G2沟槽的74%; 减阻溶液的临界雷诺数及临界温度在G1沟槽通道内比在G2通道内小

但在G2沟槽通道内则与光滑通道的基本相同; 微沟槽的减阻尺寸在减阻溶液中得到了放大; 表面活性剂与纵向微沟槽的协同强化减阻机理在于表面活性剂放大了近壁湍流涡尺度

使微沟槽能约束住更多的近壁流向涡

同时也使微沟槽能在更高雷诺数下仍有减阻强化性能。

Abstract

Based on the principle that the scale of near-wall vortices could be enlarged in the drag-reducing surfactant solution and the longitudinal microgrooves could reduce drag by restricting the motions of near-wall streamwise vortices

the possible complementary mechanism of drag reduction with surfactant and microgrooves was proposed

and their collaborative drag-reducing performance was verified by experiments. The collaborative drag-reducing performances of 0.22 mmol/L CTAC/NaSal surfactant solution in longitudinal microgroove channels with different sizes at different temperatures were investigated. It is found that the drag reduction performance of 0.22 mmol/L CTAC/NaSal solution can be enhanced by microgrooves at 20 ℃

the maximum drag reduction rate increases from 66% in smooth channel to 71% in G1 channel and 74% in G2 channel

respectively. The critical Reynolds number and critical temperature of drag-reducing solution in G1 channel are lower than that in G2 channel

but they are almost the same for G2 channel and smooth channel. The drag-reducing size of microgroove could be enlarged in the drag-reducing solution. The collaborative drag-reducing mechanism of surfactant and microgroove might be that the scale of near-wall vortices is enlarged in surfactant solutions

resulting in that microgrooves restrict more near-wall streamwise vortices and maintain the drag reduction performance at higher Reynolds number.

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references

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