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The plug flow reactor model (PFR, sometimes called continuous tubular reactor, CTR, or piston flow reactors) is a model used to describe chemical reactions in continuous, flowing systems of cylindrical geometry.
The plug flow reactor or piston flow reactor is a rectangular-type idealized flow reactor that uses a continuous fluid flow for processing materials throughout a tube.
A plug flow reactor is a cylindrical shaped tank where chemical reactions occur between a catalyst coated in the sides of the wall of the reactor and an inlet reactant ( Fig. 10.2A ). Plug flow reactors are mostly used for their unique property of not requiring any mixing.
Sep 24, 2022 · Another type of reactor used in industrial processes is the plug flow reactor (PFR). Like the CSTRs, a constant flow of reactants and products and exit the reactor. In PFRs, however, the reactor contents are not continuously stirred.
Diagram of a plug flow reactor showing flow in the z-direction. dV =⋅area dz Mass flow rate is constant (vAρ)=const. ρ=∑CWii For a liquid, dρ =0 dz dv()ρA dv dA dρ =+ρρAv+Av=0 dz dz dz dz Rearrange: dv ⎛⎞11dA dρ =−v⎜⎟+ dz ⎝⎠A dz ρdz For a normal pipe dA =0 and for a liquid dz dρ =0 dz Therefore: dv =⇒0 vv= dz 0
Plug flow is an important characteristic of flow reactors, whereby any two molecules entering the reactor at time zero, exit at a similar time. The PFR reactor model provides an effective means of controlling reaction time while optimising the separation of reactants and products.
Plug flow reactors, also known as tubular reactors, consist of a cylindrical pipe with openings on each end for reactants and products to flow through. (Copyright High Pressure Equipment Co., Erie, PA)
A Plug Flow Reactor (PFR) consists in a long, straight pipe in which the reactive fluid transits at steady-state (no accumulation). The main assumptions of this model are that the fluid is completely mixed in any cross-section at any point, but it experiences no axial mixing, i.e. contiguous cross-sections cannot exchange mass with each other.
A Plug Flow Reactor (PFR) represents a steady-state flow in a channel. Perpendicular to the flow direction, the gas is considered to be completely homogeneous. In the axial direction \(z\) , the state of the gas is allowed to change.
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.
