Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing

BAI Ruzhen; JIA Hui; ZHANG Cheng; WANG Jie; ZHANG Hongwei

doi:10.11949/j.issn.0438-1157.20180879

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Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing

更新时间：2025-12-10

- Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing
- CIESC Journal Issue 12, Pages: 5120-5129(2018)
- 作者机构：
  
  1. 天津工业大学分离膜与膜过程国家重点实验室,天津,300387
  2. 天津工业大学环境与化学工程学院,天津,300387
  3. 天津市光电检测技术与系统重点实验室,天津,300387
  4. 天津工业大学天津市水质安全评价与保障技术工程中心,天津,300387
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180879
  CLC： Q028.8
- Online First：05 December 2018，
  
  Published：05 December 2018
- 稿件说明：
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BAI Ruzhen, JIA Hui, ZHANG Cheng, et al. Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing[J]. CIESC Journal, 2018, (12): 5120-5129.
DOI：

BAI Ruzhen, JIA Hui, ZHANG Cheng, et al. Variation characteristics of shear force on membrane micro-interface of forward osmosis based on FBG sensing[J]. CIESC Journal, 2018, (12): 5120-5129. DOI： 10.11949/j.issn.0438-1157.20180879.

摘要

针对正渗透（FO）过程中膜面剪切力的分布式测量问题，基于光纤光栅（FBG）传感技术提出一种膜面剪切力的实时测量方法。研究了不同入口流速对剪切力分布、水通量和反向盐通量的影响，并对膜面的水力学特性进行分析。结果表明，FBG技术能够较好地给出FO膜组件表面流速的变化状况。膜面各位置的剪切力均呈现周期性的变化，在FO膜表面切向方向上，剪切力呈现空间分布的不均匀变化，直接导致了渗透通量的变化。增大入口流速能有效地改善膜面各位置的冲刷作用，但采用较大的入口流速才能使膜面距离入口较远位置的剪切力得到明显的提高。膜组件两侧剪切力的同步增加有利于提高膜通量，但单纯增加剪切力并不能更好地减缓浓差极化而提高水通量。

Abstract

A shear-force measurement method based on fiber Bragg grating (FBG) sensing technology is proposed to exert the real-time measurement of shear-force distribution on the membrane in forward osmosis (FO) process. The effects of different inlet flow rates on shear-force distribution

water flux and reverse salt flux (RSF) were investigated

and the hydraulic properties of membrane interface behavior were analyzed. The FBG results show that the FBG technique can better give the membrane shear-force shift in the FO module. The shear-force variation presented identical periodicity

and a non-uniform spatial variation of the shear-force distribution exists along the FO membrane surface

which directly leads to the change of water flux. Besides

the shear could be effectively improved at all locations on the membrane by increasing the inlet flow rate

but the larger flow should be applied to significantly improve the shear force farther from the inlet. The simultaneous increase of the shear force on both sides of the membrane module is beneficial to improve water flux

but simply increasing the shear force couldn't better reduce the concentration polarization (CP) and get higher flux.

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