A laminar flow model for 3D time-of-flight MR angiography

2002 ◽  
Author(s):  
D. Chen ◽  
L.K. Hedges ◽  
C.X. Yu
Keyword(s):  
Laminar Flow ◽  
Mr Angiography ◽  
Flow Model ◽  
Time Of Flight ◽  
Laminar Flow Model

Laminar Flow Model in Ducts of Circular Section With Arbitrary Axial Variation

2010 ◽  
Author(s):  
Mario F. Letelier ◽  
Dennis A. Siginer ◽  
Juan S. Stockle ◽  
Andy Huilcan
Keyword(s):  
Laminar Flow ◽  
Flow Model ◽  
Pressure Field ◽  
Axial Direction ◽  
Working Fluid ◽  
Circular Section ◽  
Circular Duct ◽  
Variable Section ◽  
Axial Variation ◽  
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.

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

1991 ◽  
Vol 15 (3) ◽  
pp. 483-488 ◽  
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

Intestinal absorption kinetics using a laminar flow model.

1989 ◽  
Vol 12 (6) ◽  
pp. 332-340
Author(s):  
Masahiro YOKOKAWA ◽  
Ryuichiro NISHIGAKI ◽  
Koshiro UMEMURA ◽  
William L. HAYTON
Keyword(s):  
Laminar Flow ◽  
Intestinal Absorption ◽  
Flow Model ◽  
Absorption Kinetics ◽  
Laminar Flow Model

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

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.

Laminar flow model of particle capture of axial magnetic filters

1978 ◽  
Vol 14 (6) ◽  
pp. 1165-1169 ◽  
Author(s):  
R. Birss ◽  
R. Gerber ◽  
M. Parker ◽  
T. Sheerer
Keyword(s):  
Laminar Flow ◽  
Flow Model ◽  
Particle Capture ◽  
Laminar Flow Model

Performance Comparison of Aerostatic Gas Bearings of Two Different Gas Supply Modes

2010 ◽  
Vol 139-141 ◽  
pp. 839-843
Author(s):  
Ang Sun ◽  
Zu Wen Wang
Keyword(s):  
Laminar Flow ◽  
Flow Model ◽  
Load Capacity ◽  
Performance Comparison ◽  
High Load ◽  
Experimental Result ◽  
Gas Field ◽  
Gas Bearing ◽  
Gas Supply ◽  
Laminar Flow Model

In order to analyze the feature of high-load and high-stiffness gas bearing with tapered recess, the complete gas field consisting of supply hole and clearance is built up, and a laminar flow model and a sectional turbulent-laminar flow model are respectively applied to calculate the pressure distribution of centrally-fed gas bearing with tapered recess in different clearances. The theoretical results agree in general with the experimental. The experimental result demonstrates its high load, however its big gas cavity. On the above basis a circular ring gas supply bearing with tapered recess is presented, the calculation result shows that for this new type of ring inlet bearing the pressure drop in entrance area will be reduced effectively even with smaller tapered recess height, and compared with centrally-fed gas bearing with tapered recess, its gas recess volume decreased and stability increased, while the load capacity is basically the same.

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