مقاله On the conditional superiority of counter-current over co-current extraction in microchannels : تی پی بین

خلاصه مقاله

In liquid–liquid extraction, counter-current flow of the phases always results in an improved performance as compared to co-current flow, under similar operating conditions. However, it is challenging to implement counter-current flow in a microchannel. Therefore, the improvement in extraction performance must be significant to justify the selection of counter-current flow over co-current flow in microchannels. In this study, we identify the range of fluid properties and operating conditions for which counter-current operation exhibits significant benefits. For this, simplified mathematical models are developed for both co-current and counter-current extraction in the stratified flow regime. These models, while being simple, capture the essential physics of the extraction process and facilitate a thorough investigation of the relative extraction performance across the parameter space. An analytical solution, based on the theory of Sturm–Liouville linear operators, is obtained for the case of co-current flow. The counter-current model belongs to the class of two-way diffusion equations for which a novel semi-analytical solution is presented. The analysis of the predictions of the models shows that the relative extraction performance is governed by a general principle of maximum gain at mediocre performance. These results help identify the significantly restricted range of operating parameters for which counter-current operation is a truly attractive alternative to the co-current mode of extraction in microchannels.

نویسندگان

J. R. Picardo [ Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India ]

S. Pushpavanam [ Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India ]

کلمات کلیدی

Mathematical modeling Two way diffusion Microchannel Extraction Co current Counter current Stratified

آدرس این مقاله

آدرس مستقیم دسترسی به این مقاله

مشخصات کنفرانس

مشاهده مقالات

Microfluidics and Nanofluidics 2013

Microfluidics and Nanofluidics is an international peer reviewed journal exploring all aspects of microfluidics, nanofluidics, and lab-on-a-chip science and technology. The journal seeks to improve the fundamental understanding of microfluidic and nanofluidic processes, examining the current state of research and development and the latest applications. This journal broadly interprets microfluidics and nanofluidics as the study of mass (including molecular and colloidal) and momentum transfer, heat transfer, and reactive processes, coupled with transport in microscale and nanoscale systems. Readers will find reports of original scientific research, techniques, and applications. In addition, the journal publishes brief communications presenting urgent announcements of significant advances or preliminary accounts of new work and topical reviews summarizing accepted practices and reporting progress in selected areas.

حوزه های تحت پوشش : Engineering Fluid Dynamics, Biomedical Engineering, Analytical Chemistry, Nanotechnology and Microengineering