The flow would travel as a plug flow, with an essentially non-deforming mass travelling on a thin shear zone and the en masse freezing occurs when the driving stress falls below a certain level.
32.
With respect to batch and Continuously stirred-tank reactors ( CSTRs ) however have a residence time distribution and cannot mirror batch or plug flow reactors, which can cause a difference in the dispersity of final polymer.
33.
The Plug Flow Tube Reactor ( PFTR ) is a model of an ideal reactor characterized by the input of a premixed reaction mixture of reactants and solvents on one side and a removal of the product on the other side.
34.
An ideal plug flow reactor has a fixed residence time : Any fluid ( plug ) that enters the reactor at time t will exit the reactor at time t + \ tau, where \ tau is the residence time of the reactor.
35.
It is however experimentally observed that the velocity of the gas and liquid phases can be significantly different, depending on the flow pattern ( e . g ., plug flow, annular flow, bubble flow, stratified flow, slug flow, churn flow ).
36.
Dispersion can be 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 is caused by random molecular motions ( i . e . Brownian motion ) and is a microscopic phenomenon.
37.
Real plug flow reactors do not satisfy the idealized flow patterns, back mix flow or plug flow deviation form ideal behavior can be due to channeling of fluid through the vessel, recycling of fluid within the vessel or due to the presence of stagnant region or dead zone of fluid in the vessel.
38.
Real plug flow reactors do not satisfy the idealized flow patterns, back mix flow or plug flow deviation form ideal behavior can be due to channeling of fluid through the vessel, recycling of fluid within the vessel or due to the presence of stagnant region or dead zone of fluid in the vessel.
