Abstract
The transformation of lab-scale continuous synthesis to the commercial scale demands an increase in throughput either through scale-up or scale-out (numbering up). Numbering up involves the parallelization of single, lab-scale unit into multiple units of the same dimensions, and thus it offers better control over transport characteristics, safety, and economics of the process as compared to conventional scale-up. However, the major constraint in adopting the approach is in the complexity in maintaining the required flow distribution throughout the device, especially multiphase flows. This chapter discusses the reports on application of numbering up (internal and external) for chemical synthesis, various design configurations involving consecutive, bifurcation structures, 2D and 3D planar distributor designs, methods of analysis of flow distribution, etc. Different modeling approaches for single and multiphase flow distribution are analyzed, including pressure drop model for consecutive structures, two-phase network resistance model, energy balance coupled with network of resistance model for barrier-based manifold design, etc. Subsequently, complexities in numbering up are thoroughly discussed by considering different aspects, viz. flow distributor designs, RTD, and heat transfer modeling. Design guidelines are provided for selecting the scale-out approach and suitable geometry depending on the process requirement. Finally, a few key concerns which remains unaddressed and need detailed investigation are presented.
The authors M.K. Sharma and M.S. Khan contributed equally to this work.
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Sharma, M.K., Khan, M.S., Kulkarni, A.A. (2023). Flow Distribution of Multiphase Flow in Parallel Channels. In: Yeoh, G.H., Joshi, J.B. (eds) Handbook of Multiphase Flow Science and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-287-092-6_31
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