Experimental Investigation on Flow Pattern of Different Fluid-Nitrogen in Square Channels

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Experimental Investigation on Flow Pattern of Different Fluid-Nitrogen in Square Channels

更新时间：2025-07-09

- Experimental Investigation on Flow Pattern of Different Fluid-Nitrogen in Square Channels
- Vol. 45, Issue 1, Pages: 26-30(2011)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK124
- Online First：10 January 2011，
  
  Published：2011
- 稿件说明：
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Experimental Investigation on Flow Pattern of Different Fluid-Nitrogen in Square Channels[J]. 2011, 45(1): 26-30.
DOI：

Experimental Investigation on Flow Pattern of Different Fluid-Nitrogen in Square Channels[J]. 2011, 45(1): 26-30. DOI：

摘要

采用可视化手段研究了水力直径为2.5 mm的正方形小通道内蔗糖-氮气、羧甲基纤维素钠(CMC)-氮气、水-氮气和水力直径为1.0 mm的正方形小通道内蔗糖-氮气的垂直绝热上升流动

对其流型、压降进行了实验采集.实验中的典型流型有:弹状流、搅拌流和环状流.通过大量的数据得到了各个溶质的流型转变图和压降曲线

对各种流型的流动机理进行了分析

着重对黏弹性对于流动的影响进行了研究.通过水力直径为2.5 mm的小通道内蔗糖-氮气、CMC-氮气和水-氮气流型的对比

总结了流体的黏弹性、流量对于流型转变的影响.对不同水力直径时的蔗糖-氮气流型进行对比研究

总结了流体水力直径、表面张力等因素对于流型转变的影响

同时在水力直径为1.0 mm的小通道内发现了明显的二次流动现象.实验证实Chisholm方法对于非牛顿流体的压降处理已不再适用.

Abstract

Flow visualization experiments of different fluid-nitrogen co-current upward flow were conducted in a square channel with a hydraulic diameter of 2.5 mm. Three kinds of fluids were studied

i.e.

water

saccharose

and sodium carboxymethyl cellulose(CMC). The typical flow patterns of different gases at liquid superficial velocities were recognized

including slug flow

churn flow

and annular flow. Flow visualization experiments on saccharose-nitrogen co-current upward flow were also carried out in a square channel with a hydraulic diameter of 1.0 mm. The flow regime maps and the pressure drop of the working fluids were obtained according to the plentiful experimental data. Flow mechanism in each flow pattern was discussed and the main factors affecting flow pattern were explored

in particular

the influence of the viscosity and the fluid flux. The results show that the surface tension

secondary flow

and hydraulic diameter have significant effect on the flow pattern transition. The experiment with the hydraulic diameter of 2.5 mm indicates that the Chisholm method may not suit the non-Newtonian fluid.

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Keywords

references

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李静.羧甲基纤维素钠溶液的流变性质及其对酸性乳体系的稳定作用[D].上海:上海交通大学化学化工学院,2007:16-23.

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