EFFECT OF POLYMERIC REDUCER ONTIME-CORRELATION STRUCTURE OF TURBULENCE  IN PIPE CENTERLINE REGION

Wu Jia; Chen Ruifang(Department of Chemical Engineeing

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EFFECT OF POLYMERIC REDUCER ONTIME-CORRELATION STRUCTURE OF TURBULENCE IN PIPE CENTERLINE REGION

更新时间：2025-12-16

- EFFECT OF POLYMERIC REDUCER ONTIME-CORRELATION STRUCTURE OF TURBULENCE IN PIPE CENTERLINE REGION
- CIESC Journal Issue 6, (1998)
- 作者机构：
  
  浙江大学化工系!杭州310027,浙江大学化工系,杭州,310027
- 作者简介：
- 基金信息：
- DOI：
  CLC： 357.5
- Online First：25 December 1998，
  
  Published：25 December 1998
- 稿件说明：
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Wu Jia, Chen Ruifang(Department of Chemical Engineeing. EFFECT OF POLYMERIC REDUCER ONTIME-CORRELATION STRUCTURE OF TURBULENCE IN PIPE CENTERLINE REGION[J]. CIESC Journal, 1998, (6).
DOI：

Wu Jia, Chen Ruifang(Department of Chemical Engineeing. EFFECT OF POLYMERIC REDUCER ONTIME-CORRELATION STRUCTURE OF TURBULENCE IN PIPE CENTERLINE REGION[J]. CIESC Journal, 1998, (6). DOI：

摘要

采用二维激光Doppler测速仪研究了微量聚丙烯酰胺（PAM）减阻剂对水在矩形管管心区的湍流时间相关结构的影响。实验结果表明，当高分子减阻剂导致减阻现象发生时，湍流脉动速度的时间相关特性发生了明显的变化：在相同雷诺数下，横、纵向速度的自相关时间尺度以及两者间的互相关时间尺度都随减阻剂质量分数增加而增大，其变化趋势与减阻率的变化相一致．本文首次报道了新的实验现象：管心处纵向-横向速度互相关系数随延迟时间先增大再减小到零的时效现象。本文的研究结果为进一步的理论分析提供了新的实验事实，并对粘弹性在减阻机理中的作用提供了有利的支持．

Abstract

The effect of polymeric additives PAM on the time-correlation structure of turbulence in the cenerline region of a rectangular pipe was investigated experimentally with a 2-dimensional laser Doppler velocimeter.It was found under the condition of drag reduction that the time-correlation charactenristics of turbulent fluctuating velocities showed obvious changes.At the same Rynolds number

all the time scales of longitudinal autocorrelation

transversal autocorrelation and cross-correlation increased with the additive concentration. This trend of change is consistent with that of drag reduction ratio.A new phenomenon

the time-effect of cross-correlation coefficient at the centreline

is reported for the first time．These results provide further theoretical investigation with new experimental facts

and support the role of viscoelasticity in the mechanism of drag reduction.

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