Mass transfer and dispersion enhancement using oscillatory motion and nanofluids

使用振荡运动和纳米流体增强传质和分散

• 批准号: 238635-2008
• 负责人: Gomaa, Hassan
• 金额: $ 1.47万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=454983
• 关键词: Mass; transfer; dispersion; enhancement; using

Process intensification and implementation of green technologies such as membrane separation techniques offer very promising approach to meet the challenges stemming from rapid development in consumer demand and constraints from public concern over environment and safety. Unfortunately most of these technologies are limited by low transfer rates caused by concentration polarization, surface fouling and low molecular diffusion. Use of oscillatory motion has proven effective in increasing transfer rates in many applications such as gas-liquid, liquid-liquid, and solid-liquid systems. It can also be used for enhancing performance of applications limited by molecular diffusion such as supported liquid membranes which are emerging as promising alternative to conventional liquid extraction. This however still requires more investigation to determine the effect of oscillation on flow patterns and transfer mechanisms involved and its contribution to the overall enhancement. Another technique that can potentially be applied for augmenting transfer rates is the use of nanofluids. The approach has proven effective in improving thermal conductivities and could therefore affect mass transport in a similar way. Combining this with oscillatory motion could offer an attractive option for enhancing the performance of applications limited by molecular diffusion and/or low interfacial transfer rate. Unfortunately, no information is available on the use of nanofluids for mass transfer or dispersion enhancement. The main objective of this research program is address the above issues, and to gain the required knowledge to enable the effective use of oscillatory motion and nanofluids for mass transfer and dispersion enhancement. A second objective of this research program is to investigate the potential of achieving optimum oscillatory conditions using passive means such as self-sustained oscillation as an alternative to forced oscillation which adds to the complexity and energy consumption of the process.

膜分离技术等绿色技术的过程强化和实施为应对消费者需求的快速发展和公众对环境和安全的关注所带来的挑战提供了非常有前途的途径。不幸的是，这些技术大多受到由浓度极化、表面污垢和低分子扩散引起的低传输速率的限制。在许多应用中，如气-液、液-液和固-液系统中，振荡运动的使用已被证明可以有效地提高传输速率。它还可以用于增强受分子扩散限制的应用的性能，例如支撑液体膜，这正在成为传统液体萃取的有前途的替代品。然而，这仍然需要更多的研究来确定振荡对流动模式和所涉及的传递机制的影响及其对整体增强的贡献。另一种可能用于提高传输速率的技术是使用纳米流体。该方法已被证明在改善导热性方面是有效的，因此可以以类似的方式影响质量传递。将其与振荡运动相结合，可以为提高受分子扩散和/或低界面传递速率限制的应用性能提供一个有吸引力的选择。不幸的是，没有关于使用纳米流体进行传质或增强分散的信息。本研究计划的主要目标是解决上述问题，并获得所需的知识，以便有效地利用振荡运动和纳米流体进行传质和分散增强。本研究计划的第二个目标是研究利用被动手段实现最佳振荡条件的潜力，如自我持续振荡，作为强制振荡的替代方案，这增加了过程的复杂性和能量消耗。