scholarly journals Inlet Effect Caused by Multichannel Structure for Molecular Electronic Transducer Based on a Turbulent-Laminar Flow Model

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2154
Author(s):  
Qiuzhan Zhou ◽  
Qi He ◽  
Yuzhu Chen ◽  
Xue Bao
Keyword(s):  
Laminar Flow ◽  
Input Signal ◽  
Performance Optimization ◽  
Theoretical Basis ◽  
Flow Model ◽  
Liquid Motion ◽  
Molecular Electronic ◽  
Insulating Layer ◽  
Molecular Electron ◽  
Laminar Flow Model

The actual fluid form of an electrolyte in a molecular electronic converter is an important factor that causes a decrease in the accuracy of a molecular electronic transducer (MET) liquid motion sensor. To study the actual fluid morphology of an inertial electrolyte in molecular electron transducers, an inlet effect is defined according to the fluid morphology of turbulent-laminar flow, and a numerical simulation model of turbulent-laminar flow is proposed. Based on the turbulent-laminar flow model, this paper studies the variation of the inlet effect intensity when the thickness of the outermost insulating layer is 50 µm and 100 µm, respectively. Meanwhile, the changes of the inlet effect intensity and the error rate of central axial velocity field are also analyzed when the input signal intensity is different. Through the numerical experiment, it verifies that the thickness of the outermost insulating layer and the amplitude of the input signal are two important factors which can affect the inlet effect intensity and also the accuracy of the MET. Therefore, this study can provide a theoretical basis for the quantitative study on the performance optimization of a MET liquid sensor.

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
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