scholarly journals New insights into the physics of inertial microfluidics in curved microchannels. II. Adding an additive rule to understand complex cross-sections

2019 ◽  
Vol 13 (3) ◽  
pp. 034118 ◽  
Author(s):  
Mehdi Rafeie ◽  
Shahin Hosseinzadeh ◽  
Jingrui Huang ◽  
Asma Mihandoust ◽  
Majid Ebrahimi Warkiani ◽  
...  
Keyword(s):  
Cross Sections ◽  
Inertial Microfluidics ◽  
Complex Cross ◽  
Additive Rule

The Radiotransparent Windows Formed of Waveguides with Complex Cross Sections

PIERS Online ◽  
2009 ◽  
Vol 5 (5) ◽  
pp. 446-450
Author(s):  
Anatoly S. Ilinskiy ◽  
Yury Ya. Kharlanov
Keyword(s):  
Cross Sections ◽  
Complex Cross

scholarly journals High-Throughput Particle Concentration Using Complex Cross-Section Microchannels

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 440 ◽  
Author(s):  
Asma Mihandoust ◽  
Sajad Razavi Bazaz ◽  
Nahid Maleki-Jirsaraei ◽  
Majid Alizadeh ◽  
Robert A. Taylor ◽  
...  
Keyword(s):  
Cross Section ◽  
High Throughput ◽  
Cross Sections ◽  
Particle Concentration ◽  
Separation Efficiency ◽  
Channel Cross Section ◽  
Total Width ◽  
Particle Focusing ◽  
Complex Cross ◽  
Complex Cross Section

High throughput particle/cell concentration is crucial for a wide variety of biomedical, clinical, and environmental applications. In this work, we have proposed a passive spiral microfluidic concentrator with a complex cross-sectional shape, i.e., a combination of rectangle and trapezoid, for high separation efficiency and a confinement ratio less than 0.07. Particle focusing in our microfluidic system was observed in a single, tight focusing line, in which higher particle concentration is possible, as compared with simple rectangular or trapezoidal cross-sections with similar flow area. The sharper focusing stems from the confinement of Dean vortices in the trapezoidal region of the complex cross-section. To quantify this effect, we introduce a new parameter, complex focusing number or CFN, which is indicative of the enhancement of inertial focusing of particles in these channels. Three spiral microchannels with various widths of 400 µm, 500 µm, and 600 µm, with the corresponding CFNs of 4.3, 4.5, and 6, respectively, were used. The device with the total width of 600 µm was shown to have a separation efficiency of ~98%, and by recirculating, the output concentration of the sample was 500 times higher than the initial input. Finally, the investigation of results showed that the magnitude of CFN relies entirely on the microchannel geometry, and it is independent of the overall width of the channel cross-section. We envision that this concept of particle focusing through complex cross-sections will prove useful in paving the way towards more efficient inertial microfluidic devices.

scholarly journals Numerical Modelling of Thermal Insulation of Reinforced Concrete Ceilings with Complex Cross-Sections

2020 ◽  
Vol 10 (8) ◽  
pp. 2642 ◽  
Author(s):  
Łukasz Drobiec ◽  
Rafał Wyczółkowski ◽  
Artur Kisiołek
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Cross Sections ◽  
Good Alternative ◽  
Numerical Analyses ◽  
The Finite Element Method ◽  
Equivalent Thermal Conductivity ◽  
Air Voids ◽  
Complex Cross ◽  
Calculation Results

The article describes the results of numerical analyses and traditional calculations of the heat transfer coefficient in ceilings with a complex cross-section, and with materials of varying density built-in inside the cross-section. Prefabricated prestressed reinforced concrete, composite reinforced, and ribbed reinforced concrete ceilings were analyzed. Traditional calculations were carried out in accordance with the EN ISO 6946:2017 standard, while the numerical analyses were carried out in a program based on the finite element method (FEM). It has been shown that calculations can be a good alternative to nondestructive testing (NDT) and laboratory tests, whose use in the case of ceilings with different geometries is limited. The differences between the calculations carried out in accordance with EN ISO 6946:2017, and the results of numerical analyses are 12%–39%. The way the air voids are taken into account has an impact on the calculation results. In the traditional method, an equivalent thermal conductivity coefficient was used, while in the numerical analysis, the coefficient was selected from the program’s material database. Since traditional calculations require simplifications, numerical methods should be considered to give more accurate results.

New Higher Order Method of Moments for Accurate Inductance Extraction in Transmission Lines of Complex Cross Sections

2017 ◽  
Vol 65 (12) ◽  
pp. 5104-5112 ◽  
Author(s):  
Farhad Sheikh Hosseini Lori ◽  
Mohammad Shakander Hosen ◽  
Anton Menshov ◽  
Mohammad Shafieipour ◽  
Vladimir I. Okhmatovski
Keyword(s):  
Method Of Moments ◽  
Cross Sections ◽  
Transmission Lines ◽  
Higher Order ◽  
Order Method ◽  
Inductance Extraction ◽  
Complex Cross ◽  
Higher Order Method

Dispersion curves of 2D rods with complex cross-sections: double orthogonal polynomial approach

Meccanica ◽  
2014 ◽  
Vol 50 (1) ◽  
pp. 109-117 ◽  
Author(s):  
J. G. Yu ◽  
J. E. Lefebvre ◽  
Ch. Zhang ◽  
F. E. Ratolojanahary
Keyword(s):  
Orthogonal Polynomial ◽  
Cross Sections ◽  
Dispersion Curves ◽  
Complex Cross ◽  
Double Orthogonal Polynomial
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