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Plug flow information


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.

The plug flow model has many practical applications. One example is in the design of chemical reactors. Essentially no back mixing is assumed with "plugs" of fluid passing through the reactor. This results in differential equations that need to be integrated to find the reactor conversion and outlet temperatures. Other simplifications used are perfect radial mixing and a homogeneous bed structure.

An advantage of the plug flow model is that no part of the solution of the problem can be perpetuated "upstream". This allows one to calculate the exact solution to the differential equation knowing only the initial conditions. No further iteration is required. Each "plug" can be solved independently provided the previous plug's state is known.

The flow model in which the velocity profile consists of the fully developed boundary layer is known as pipe flow. In laminar pipe flow, the velocity profile is parabolic.[1]

  1. ^ Massey, Bernard; Ward-Smith, John (1999). "6.2 Steady laminar flow in circular pipes: The Hagen-Poiseuille law". Mechanics of fluids (7th ed.). Cheltenham: Thornes. ISBN 9780748740437.

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in chemical reactors. Slip ratio (gas–liquid flow) Slugcatcher Plug flow Two-phase flow Multiphase flow Bai, Yong; Bai, Qiang (2005). Subsea Pipelines...

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Fields of study Hydraulics Fluid Mechanics Types of fluid flow Open channel flow Plug flow Fluid properties Viscosity Fluid phenomena Head Çengel, Yunus...

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system; an occluded vessel creates eddies in the normally laminar flow or plug flow blood currents. These eddies create abnormal fluid velocity gradients...

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continuous phase and at low values it forms the disperse phase. In plug and slug flow, gas flows faster than the liquid and the liquid forms a 'slug' which becomes...

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differentiated from diffusion in that it is caused by non-ideal flow patterns (i.e. deviations from plug flow) and is a macroscopic phenomenon, whereas diffusion...

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reactant concentrations due to their superior heat transfer capacities. Plug flow reactors have the additional advantage of greater separation between reactants...

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specially designed chemical reactor to achieve plug flow under laminar flow conditions. Achieving plug flow has previously been limited to either a large...

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the vessel to create a semi circular flow channel. The heat transfer fluid passes through the channel in a plug flow fashion. A large reactor may use several...

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studied in a laminar flow reactor. Chemical reactor Laminar flow Plug flow reactor model Turbulence Laminar vs. turbulent flow LEE, J.C.; R.A. YETTER;...

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analysed to identify the velocities of the plug flow like movement down the centre of the aorta. The plug flow velocities can be differentiated and integrated...

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