Mass transfer and dispersion enhancement using oscillatory motion and nanofluids

过程强化和实施绿色技术，如膜分离技术，提供了非常有前途的方法，以满足来自消费者需求的快速发展和公众对环境和安全的关注的限制的挑战。不幸的是，这些技术中的大多数受到由浓差极化、表面结垢和低分子扩散引起的低传递速率的限制。在许多应用中，例如气-液、液-液和固-液系统中，使用振荡运动已被证明在提高传递速率方面是有效的。它也可用于增强受分子扩散限制的应用的性能，例如支撑液膜，其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，以确定振荡的流动模式和传输机制的影响，其贡献的整体增强。另一种可以潜在地应用于提高传输速率的技术是使用纳米流体。该方法已被证明在提高导热性方面是有效的，因此可以以类似的方式影响质量传输。将其与振荡运动相结合可以提供一种有吸引力的选择，用于增强受分子扩散和/或低界面转移速率限制的应用的性能。不幸的是，没有关于使用纳米流体进行传质或分散增强的信息。该研究计划的主要目标是解决上述问题，并获得所需的知识，使振荡运动和纳米流体的传质和分散增强的有效利用。本研究计划的第二个目标是调查实现最佳振荡条件的潜力，使用被动手段，如自持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耗。

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.