Intestinal absorption kinetics using a laminar flow model.

Laminar flow inside a circular duct of variable section in the axial direction is modeled, assuming that the working fluid is Newtonian, incompressible, with laminar flow, a permanent state, and constant properties. The results describe the behavior of the stream function, the velocity field, and the pressure field, and graphic results are presented for each of those functions. The method used to solve the problem makes use of regular perturbations around the shape factor ε parameter. This research can be used for the design of new technological devices important to industry, optimizing processes in which fluids are transported, energy is transferred, etc.

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Optimization of flow-through cells for dialysis and other membrane separations in flow-injection analysis using a laminar flow model

Analytica Chimica Acta ◽

10.1016/s0003-2670(00)83439-x ◽

1989 ◽

Vol 224 ◽

pp. 13-22 ◽

Cited By ~ 19

Author(s):

Lars Risinger ◽

Gillis Johansson ◽

Torsten Thorneman

Keyword(s):

Laminar Flow ◽

Flow Injection ◽

Flow Injection Analysis ◽

Flow Model ◽

Membrane Separations ◽

Flow Through ◽

Laminar Flow Model

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Calculation of Pressure Gradients from MR Velocity Data in a Laminar Flow Model

Journal of Computer Assisted Tomography ◽

10.1097/00004728-199105000-00027 ◽

1991 ◽

Vol 15 (3) ◽

pp. 483-488 ◽

Cited By ~ 12

Author(s):

Ronald S. Adler ◽

Thomas L. Chenevert ◽

J. Brian Fowlkes ◽

James Pipe ◽

Jonathan M. Rubin

Keyword(s):

Laminar Flow ◽

Flow Model ◽

Pressure Gradients ◽

Velocity Data ◽

Laminar Flow Model

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The Caltech Photooxidation Flow Tube Reactor – I: Design and Fluid Dynamics

10.5194/amt-2016-282 ◽

2016 ◽

Author(s):

Y. Huang ◽

M. M. Coggon ◽

R. Zhao ◽

H. Lignell ◽

M. U. Bauer ◽

...

Keyword(s):

Fluid Dynamics ◽

Laminar Flow ◽

Residence Time ◽

Flow Model ◽

Secondary Flows ◽

Aerosol Formation ◽

Flow Tube ◽

Actual Performance ◽

Tube Reactor ◽

Laminar Flow Model

Abstract. Flow tube reactors are employed to study gas-phase atmospheric chemistry and secondary organic aerosol formation. A new laminar flow tube reactor, the Caltech PhotoOxidation flow Tube (CPOT), has been designed with the aim of achieving a well-characterized fluid dynamic and residence time environment. We present here the design and fluid dynamical characterization of the CPOT, based on the fundamental behavior of vapor molecules and particles in the reactor. The design of the inlet of the CPOT, which was based on computational fluid dynamics (CFD) simulations, comprises a static mixer and a conical diffuser to facilitate rapid development of the characteristic laminar flow parabolic profile. A CFD laminar flow model is developed to simulate the residence time distribution (RTD) of vapor molecules and particles in the CPOT. To assess the extent to which the actual performance adheres to the theoretical CFD model, RTD experiments were conducted with O3 and sub-micrometer ammonium sulfate particles. The measured RTD profiles do not strictly adhere to theory, owing to slightly non-isothermal conditions in the reactor, which lead to secondary flows. Introducing an enhanced eddy-like diffusivity for the vapor molecules and particles in the laminar flow model significantly improves the model-experiment agreement. These characterization experiments, in addition to the idealized computational behavior, provide a basis on which to evaluate the performance of the CPOT as a chemical reactor.

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