Abstract
Abstract As it is known, microreactors are an important development in chemical engineering since the pharmaceutical industry needs flexible production rather than a large amount of product yield. In this paper, we propose the design of a continuous-flow microreactor in the form of a narrow cell with an adjustable gap. By tuning the gap width in time and space, one can control the reaction rate and regulate the product yield. We show that the governing equation for the fluid flow can be reduced to the Darcy equation with the permeability varying in space and time. As a benchmark reaction, we consider the neutralization of nitric acid with sodium hydroxide resulting in the solutal convection in the presence of gravity. We demonstrate numerically that the prototyping spatially-distributed relief of the reactor walls can successfully separate the incoming and outgoing flows of reagents, control the mixing intensity, increase or decrease the product yield. We show also the dynamic control of the reactor in operation via real-time local changes in the gap width.
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