Numerical Evaluation of Fin Performance Under Dehumidifying Conditions

2007 ◽  
Vol 129 (10) ◽  
pp. 1395-1402 ◽  
Author(s):  
G. Comini ◽  
C. Nonino ◽  
S. Savino
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Heat Exchangers ◽  
Numerical Evaluation ◽  
Energy Equation ◽  
Air Cooling ◽  
The Finite Element Method ◽  
Moist Air ◽  
Compact Heat Exchangers ◽  
Coupled Problem

A numerical model of moist air cooling in compact heat exchangers is presented. The model requires the solution of a coupled problem, since interface temperatures, obtained from the solution of the energy equation in adjacent fluid and solid regions, are used to set the appropriate boundary conditions for the transport equation of water vapor in moist air. The approach is completely general, even if the finite-element method is used for the simulations reported in the paper. The numerical results are favorably compared with the corresponding experimental results concerning the rectangular and wavy fins under dehumidifying conditions.

scholarly journals Numerical evaluation on steep soil-nailed slope using finite element method

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Panyabot Kaothon ◽  
Kean Thai Chhun ◽  
Chan-Young Yune
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Evaluation ◽  
Factor Of Safety ◽  
Slope Angle ◽  
The Finite Element Method ◽  
Conventional Design ◽  
Two Parameters ◽  
Element Method

AbstractIn conventional design of soil-nailed slope, the nail parameters such as nail spacing (1–2 m), and nail inclination (10º–20º) have been recommended without considering any specific slope angle. Henceforth, this paper presents a numerical evaluation on the soil-nailed slope with flexible facing based on the finite element method in order to investigate the range of those two parameters with any size of nail head in various slope angles (45º, 55º, 65º, and 75º). Based on a minimum factor of safety (FSmin  =  1.5), the analysis results indicated that the suggested range of those parameters in the conventional specification was applicable in the slope angle of 45º and 55º with any sizes of nail head. Nevertheless, it was not practical for slope angle of 65º and 75º, which required the size of nail head at least 400  ×  400  ×  250 mm, with nail spacing less than or equal to 1.5 m, and nail inclination from 5º to 10º.

Calculation of the Dynamic Coefficients of a Journal Bearing, Using a Variational Approach

1986 ◽  
Vol 108 (3) ◽  
pp. 421-424 ◽  
Author(s):  
P. Klit ◽  
J. W. Lund
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Variational Approach ◽  
Numerical Evaluation ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Temperature Dependency ◽  
The Finite Element Method ◽  
Dynamic Coefficients ◽  
The Individual

The dynamic bearing coefficients are obtained from a solution to the variational equivalent of Reynolds equation. A perturbation method is applied to find the individual dynamic coefficients. The Finite Element Method is used in the numerical evaluation of the equations. The flow is assumed to be laminar, the lubricant is Newtonian. Allowance is made for viscosity-temperature dependency in circumferential and axial directions.

Oil-Film Temperature Distribution in an Infinitely wide Slider Bearing: An Application of the Finite-Element Method

1973 ◽  
Vol 15 (4) ◽  
pp. 311-320 ◽  
Author(s):  
A. K. Tieu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Energy Equation ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Slider Bearing ◽  
Oil Film ◽  
Temperature Distributions ◽  
Oil Films ◽  
Element Method

From the Glansdorff–Prigogine local potential in non-equilibrium thermodynamics (1)† (2), a variational principle for a thin film incompressible flow with viscous dissipation is formulated as the basis of a finite-element method, which is applied to solve the energy equation. Temperature distributions in tapered land and parallel oil films for infinitely wide bearings are obtained by digital computer. The application of the finite-element method in a three-dimensional oil film with side leakage is also discussed.

scholarly journals Apparent Flexoelectricity Due to Heterogeneous Piezoelectricity

2020 ◽  
Vol 87 (11) ◽  
Author(s):  
J. Yvonnet ◽  
X. Chen ◽  
P. Sharma
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Evaluation ◽  
Piezoelectric Materials ◽  
Local Geometry ◽  
The Finite Element Method ◽  
Piezoelectric Composites ◽  
Numerical Investigations ◽  
Homogenization Approach ◽  
Measurement Artifacts

Abstract Recent work has highlighted how the phenomenon of flexoelectricity can masquerade as piezoelectricity. This notion can not only be exploited to create artificial piezoelectric-like materials without using piezoelectric materials but may also explain measurement artifacts in dielectrics. In this article, we show that the reverse is also possible and potentially advantageous in certain situations (such as energy harvesting). By constructing a computational homogenization approach predicated on the finite element method, we argue that composites made of piezoelectric phases can conspire to endow the material with a distinct overall flexoelectric-like response even though the native flexoelectricity of the constituent materials is negligible. Full finite element procedures for numerical evaluation of the different effective tensors, including the flexoelectric tensor, are provided. Numerical investigations are conducted, showing variation of the effective flexoelectric properties with respect to local geometry and properties of the composite in piezoelectric–piezoelectric and polymer–piezoelectric composites. We find that the flexoelectric response can be tuned to nearly five times higher than the constituents.

scholarly journals Numerical Evaluation of Temperature Field and Residual Stresses in an API 5L X80 Steel Welded Joint Using the Finite Element Method

Metals ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 28 ◽  
Author(s):  
Jailson Da Nóbrega ◽  
Diego Diniz ◽  
Antonio Silva ◽  
Theophilo Maciel ◽  
Victor de Albuquerque ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Residual Stresses ◽  
Numerical Evaluation ◽  
Welded Joint ◽  
The Finite Element Method ◽  
X80 Steel ◽  
Element Method

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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