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A typical plug flow reactor could be a tube packed with some solid material (frequently a catalyst). Typically these types of reactors are called packed bed reactors or PBR's. Sometimes the tube will be a tube in a shell and tube heat exchanger. When a plug flow model can not be applied, the dispersion model is usually employed. [2] [3]
is the reactor volume; is the molar flow rate per unit time of the entering reactant A; is the conversion of reactant A; is the rate of disappearance of reactant A per unit volume per unit time; For a plug flow reactor (PFR), the following relationship applies:
In fluid mechanics, plug flow is a simple model of the velocity profile of a fluid flowing in a pipe. In plug flow, the velocity of the fluid is assumed to be constant across any cross-section of the pipe perpendicular to the axis of the pipe. The plug flow model assumes there is no boundary layer adjacent to the inner wall of the pipe.
DRAGON 3.05D, Reactor Cell Calculation System with Burnup nesc0784 DSNP, Program and Data Library System for Dynamic Simulation of Nuclear Power Plant nea-1683 ERANOS 2.3N, Modular code and data system for fast reactor neutronics analyses nea-1916 FINPSA TRAINING 2.2.0.1 -R-, a PSA model in consisting of event trees, fault trees, and cut sets
Segmented flow is an approach that improves upon the speed in which screening, optimization, and libraries can be conducted in flow chemistry. Segmented flow uses a "Plug Flow" approach where specific volumetric experimental mixtures are created and then injected into a high-pressure flow reactor. Diffusion of the segment (reaction mixture) is ...
The residence time scale can take the form of a convection time scale, such as volumetric flow rate through the reactor for continuous (plug flow or stirred tank) or semibatch chemical processes: D a I = reaction rate convective mass transport rate {\displaystyle \mathrm {Da_{\mathrm {I} }} ={\frac {\text{reaction rate}}{\text{convective mass ...
Plug flow reactors have the additional advantage of greater separation between reactants and products giving a better concentration profile. The small size of continuous reactors makes higher mixing rates possible. The output from a continuous reactor can be altered by varying the run time. This increases operating flexibility for manufacturers.
The RELAP5 code was chosen as the thermal-hydraulic analysis tool because of its widespread acceptance. The application of RELAP5 to various reactor designs created the need for new modeling capabilities. In particular, the analysis of the Savannah River reactors necessitated a three-dimensional flow model. Later, under laboratory-discretionary ...