A one dimensional model for the determination of an ejector entrainment ratio

2012 ◽  
Vol 35 (4) ◽  
pp. 772-784 ◽  
Author(s):  
Javier García del Valle ◽  
José M. Sáiz Jabardo ◽  
Francisco Castro Ruiz ◽  
Julio San José Alonso
Keyword(s):  
Dimensional Model ◽  
Entrainment Ratio ◽  
One Dimensional

scholarly journals INVERSE PROBLEM OF A ONE-DIMENSIONAL MODEL IN MULTILAYER HEAT CONDUCTION

2020 ◽  
Vol 19 (1) ◽  
pp. 42
Author(s):  
G. C. Oliveira ◽  
S. S. Ribeiroa ◽  
G. Guimarães
Keyword(s):  
Inverse Problem ◽  
Measurement Errors ◽  
Input Data ◽  
Temperature Measurements ◽  
Dimensional Model ◽  
One Dimensional ◽  
Ill Posed ◽  
Measurements Errors ◽  
Chip Chip

The inverse problem in conducting heat is related to the determination of the boundary condition, rate of heat generation, or thermophysical properties, using temperature measurements at one or more positions of the solid. The inverse problem in conducting heat is mathematically one of the ill-posed problems, because its solution extremely sensitive to measurement errors. For a well-placed problem the following conditions must be satisfied: the solution must exist, it must be unique and must be stable on small changes of the input data. The objective of the work is to estimate the heat flux generated at the tool-chip-chip interface in a manufacturing process. The term "estimation" is used because in the temperature measurements, errors are always present and these affect the accuracy of the calculation of the heat flow.

scholarly journals APPLICATION OF SUPERELEMENTS IN STATIC ANALYSIS OF THIN‐WALLED STRUCTURES

2004 ◽  
Vol 10 (2) ◽  
pp. 113-122
Author(s):  
Ireneusz Kreja ◽  
Tomasz Mikulski ◽  
Czeslaw Szymczak
Keyword(s):  
Static Analysis ◽  
Standard Procedure ◽  
Dimensional Model ◽  
Fem Model ◽  
Shell Elements ◽  
One Dimensional ◽  
Thin Walled Structures ◽  
Thin Walled ◽  
Proper Solutions

A concept of a beam superelement is suggested as a new tool in the static analysis of structures made of thin‐walled members. This proposal seems to be especially attractive for treating the problems where the existing one‐dimensional models do not provide proper solutions. This class of problems includes, for instance, the torsion of thin‐walled beams with battens and the determination of the bimoment distribution at the nodes of frames made of thin‐walled members. The entire segment of the thin‐walled beam with warping stiffener or the whole node of the frame is modelled with shell elements. The stiffness matrix of such thin‐walled beam superelement can be estimated according to the standard procedure of the enforced unit displacements. The accuracy of the proposed one‐dimensional model has proved to be comparable to that offered by the detailed FEM model where the whole structure is represented by a very large number of shell elements.

Modelling of wood drying and an influence of lumber geometry on drying dynamics

1999 ◽  
Vol 4 ◽  
pp. 11-22 ◽  
Author(s):  
R. Baronas ◽  
F. Ivanauskas ◽  
M. Sapagovas
Keyword(s):  
Moisture Transfer ◽  
Dimensional Model ◽  
Wood Drying ◽  
Transfer Coefficients ◽  
One Dimensional ◽  
Surface Emission ◽  
Surface Moisture ◽  
Variable Diffusion ◽  
The One

Modelling of wood drying is analyzed. Wood drying involves moisture transfer from the interior of the wood to the surface, then from the wood surface to the surrounding air. These processes can be characterized by the internal and surface moisture transfer coefficients. A model of the two-dimensional moisture transfer is suggested to determine these coefficients in contrast to the one-dimensional model which was proposed in [12]. The model is based on a diffusion equation with a variable diffusion coefficient. The insufficiency of the one-dimensional model is considered. The influence of the geometry of a lumber on determination of the surface emission and diffusion coefficients and on the dynamics of drying is investigated.

Heat Transfer in a MEMS for Determination of Fluid and Flow Characteristics

2001 ◽  
Author(s):  
Nicolae Damean ◽  
Paul P. L. Regtien
Keyword(s):  
Heat Transfer ◽  
Flow Measurement ◽  
Flow Characteristics ◽  
Dimensional Model ◽  
One Dimensional ◽  
Qualitative And Quantitative ◽  
Sensor Structure ◽  
Modeling Errors ◽  
Transfer Mechanisms

Abstract The paper presents an one-dimensional model for the heat transfer in a limited but significant zone of an actuator-sensor structure for the determination of fluid and flow characteristics. As an essential step for the designing process of this structure, the usefulness of the model in the framework of the structure’s functionality is underlined. The main heat transfer mechanisms are detailed by qualitative and quantitative evaluations. Finally we compare the data obtained by simulating this model with the experimental data. The modeling errors are discussed. The achieved results might be used directly or adapted for various thermal based sensors for flow measurement both in micro and macro world.

scholarly journals Spectroscopy with Three-Dimensional Model Atmospheres of Late-Type Stars

2015 ◽  
Vol 11 (A29B) ◽  
pp. 151-153
Author(s):  
Remo Collet
Keyword(s):  
Three Dimensional ◽  
Spectral Lines ◽  
Differential Analysis ◽  
Late Type ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
One Dimensional ◽  
Carbon Abundance

AbstractIn this contribution, I present the results of a differential analysis of CH spectral lines for the determination of carbon abundances with three- and one-dimensional model atmospheres of late-type stars at various metallicities. 3D-1D abundance corrections are found to be significant particularly at low metallicities and for turn-off stars. The dependence of 3D-1D carbon abundance corrections on the stellar C/O ratio is also discussed.

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