Effect of temperature on forward osmosis and its numerical simulation

doi:10.3969/j.issn.0438-1157.2012.10.020

CIESC Journal ›› 2012, Vol. 63 ›› Issue (10): 3143-3151.DOI: 10.3969/j.issn.0438-1157.2012.10.020

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Effect of temperature on forward osmosis and its numerical simulation

ZHONG Ming, YOU Shijie, WANG Xiuheng, ZHONG Yijian

State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China

Received:2012-02-01 Revised:2012-05-03 Online:2012-10-05 Published:2012-10-05
Supported by:
supported by the Natural Science Foundation of Heilongjiang Province(E201154),the National Innovation Team supported by the National Science Foundation of China(51121062)and the State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology)(2012DX05).

温度对正向渗透的影响机制与数值模拟

钟铭, 尤世界, 王秀蘅, 钟溢健

哈尔滨工业大学城市水资源与水环境国家重点实验室, 黑龙江哈尔滨 150090

通讯作者: 王秀蘅
作者简介:王秀蘅,钟铭(1987- ),男,硕士研究生。
基金资助:
黑龙江省自然科学基金项目(E201154);"城市水质转化规律与保障技术"国家创新研究群体科学基金项目(51121062);城市水资源与水环境国家重点实验室自主课题(2012DX05)。

Abstract

Abstract: Forward osmosis(FO)is a new membrane technology with the osmotic pressure of solution as the driving force.The water flux in FO process depends heavily on the temperature due to its effects on properties of solution and membrane and the interaction between them.In this study,the effect of temperature in FO process was investigated using numerical simulation and experiments.The results show that the FO water flux increases with temperature.In the presence of transmembrane temperature difference,the temperature of feed solution predominates the water flux over the temperature of draw solution,due to decreased solution viscosity and enhanced diffusion with elevated temperature.At different temperature profiles,water and heat flux increase with flow rate,resulted from the enhancement of mass and heat transfer within the depressed fluid boundary layer on the membrane surface.

Key words: forward osmosis, temperature, water flux, heat flux

摘要： 正向渗透(FO)是一种以溶液自身渗透压作为推动力的膜分离技术。温度对溶液、膜的性质以及溶液与膜之间的相互作用有很大影响,进而影响FO的水通量。利用数值模拟与试验研究了温度对FO性能的影响。结果表明,当膜两侧等温时,FO水通量随着温度的升高而增大;当膜两侧不等温时,原液(FS)一侧温度的影响比提取液(DS)一侧更大,主要是因为温度升高降低了溶液黏度,强化了过膜扩散过程,而温度对DS渗透压的影响不明显。在不同温度条件下,FO水通量和热通量随流量的增大而增大,主要是由于流速的增大压缩膜表面的流体边界层,强化了传质和传热过程。

关键词: 正向渗透, 温度, 水通量, 热通量

CLC Number:

TQ028.3

ZHONG Ming, YOU Shijie, WANG Xiuheng, ZHONG Yijian. Effect of temperature on forward osmosis and its numerical simulation[J]. CIESC Journal, 2012, 63(10): 3143-3151.

钟铭, 尤世界, 王秀蘅, 钟溢健. 温度对正向渗透的影响机制与数值模拟[J]. 化工学报, 2012, 63(10): 3143-3151.

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Effect of temperature on forward osmosis and its numerical simulation

温度对正向渗透的影响机制与数值模拟

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