Journal papers using FIDAP as a numerical simulation tool

Numerical simulation of human exposure to aerosols generated during compressed air spray-painting in cross-flow ventilated booths
Flynn MR, Sills ED
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME

123: (1) 64-70 MAR 2001

Abstract:
This paper examines the use of computational fluid dynamics as a tool for predicting human exposure to aerosols generated during compressed air spray painting in cross-flow: ventilated booths. Wind tunnel experiments employing a mannequin and non-volatile oil provide data to evaluate the numerical predictions. Fidap, (v8.01) is used to calculate the velocity field and particle trajectories. while in-house codes,were developed to post-process the trajectory data into mass concentrations, size distributions, transfer efficiency, and over-spray generation rates. The predicted dimensionless breathing-zone concentration of 0.13+/-23 percent is in agreement with the measured value of 0.13+/-15 percent given the uncertainties involved in such commissions. Computational fluid dynamics is a powerful tool capable of providing: useful information to occupational hygiene engineers involved in controlling human exposures to toxic airborne contaminants.

Non-isothermal transient flow and molecular orientation during injection mold filling
Nguyen-Chung T, Mennig G
RHEOLOGICA ACTA

40: (1) 67-73 JAN 2001

Abstract:
The properties of injection molded products are directly related to the microstructure which in turn strongly depends on the flow kinematics and thermal history of the polymer melt during the filling process. In this study the mold filling process has been analyzed by using an FEM-code (FIDAP) to solve the equation of continuity, momentum, and energy under transient and non-isothermal conditions. As constitutive relation for a purely viscous fluid, the Bird-Carreau and Arrhenius model was chosen. The phenomenon at the flow front, its flow kinematics, and its significant implication on the microstructure of the part have been investigated in detail. Computed particle tracking showed good agreement with experiments under real processing conditions. Furthermore, a rather simple but effective and useful method for predicting the orientation distribution in an injection molded part was proposed. It was found that the local deformation near the solid wall may be considered as the main source for a typical layer of high orientation on the surface of the part.

Oscillatory thermocapillary convection in liquid bridges with highly deformed free surfaces: Experiments and energy-stability analysis
Sumner LBS, Neitzel GP, Fontaine JP, Dell'Aversana P
PHYSICS OF FLUIDS

13: (1) 107-120 JAN 2001

Abstract:
Laboratory experimentation, numerical simulation, and energy-stability theory are used to examine the effect of interface deformation on the onset of oscillatory thermocapillary convection in half zones. Experiments are performed to map the stability boundaries marking the onset of oscillatory flow, modifying the free-surface deformation by adjusting the volume of liquid in the bridge. The stability results presented here along with those of other researchers [Monti , Proceedings of the 43rd Cong. Int. Artro. Fed. (1992); Hu , J. Cryst. Growth 142, 379 (1994)] show that free-surface curvature can have a pronounced influence on flow stability. Steady, axisymmetric flow simulations are computed using the commercial code FIDAP to model the conditions of the experiments, and reveal that flow structure near the stability boundary is sensitive to several parameters. Energy theory is applied to these simulations to determine sufficient conditions for stability. Comparisons between the theoretical and experimental results show nonconservative energy limits falling above the experimentally determined stability boundaries for bridges of various liquid volumes. While the trend of the experimental data is predicted for zones of large volume ratio (bulging zones), the same cannot be said for those with small volume ratio (necked-down zones). In addition, energy-stability limits for some undeformed-free-surface cases were determined which are above the linear-stability limits determined by other researchers, in clear contradiction of the roles of the respective theories. (C) 2001 American Institute of Physics.

Thermal activation of electrochemical processes in a Rf-heated channel flow cell: experiment and finite element simulation
Qiu FL, Compton RG, Coles BA, Marken F
JOURNAL OF ELECTROANALYTICAL CHEMISTRY

492: (2) 150-155 OCT 20 2000

Abstract:
A novel approach to thermoelectrochemistry is presented which involves the direct heating of the working electrode in a channel flow cell system by eddy currents caused by 8 MHz radio frequency (Rf) radiation. For the model redox systems Fe(CN)(6)(3-/4-) and Ru(NH3)(6)(3+/2+) it is shown that it is possible to perform electrochemical experiments with simultaneous thermal activation at temperatures close to the boiling point of the electrolyte solution. Quantitative analysis of data obtained from thermoelectrochemical studies in the Rf-heated channel flow system is possible with the help of a computer model. Numerical simulation results obtained with a finite element program (FIDAP(TM)) for the complex heat and mass flow during voltammetric experiments at the heated electrode are shown to be in quantitative agreement with experimental data. Both the increase in the rate of diffusion as well as the change in the flow pattern in the heated low viscosity region of the channel are shown to contribute significantly to the enhanced mass transport. After confirming the quantitative agreement of the numerical model with the data obtained for the oxidation of Fe(CN)(6)(4-) and the reduction of Fe(CN)(6)(3-) in 0.1 M KCl, the activation energy for the Ru(NH3)(6)(3+/2+) redox system diffusion in 0.1 M KCl is determined. (C) 2000 Elsevier Science B.V. All rights reserved.

Numerical simulation of heat transfer in transparent and semitransparent crystal growth processes
Barvinschi F, Duffar T, Santailler JL
JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS

2: (4) 327-331 DEC 2000

Abstract:
The finite element software FIDAP (FLUENT(TM)) was used to calculate the thermal distribution in the sample and its surroundings during the Bridgman and Verneuil single crystal growth processes; All thermal exchanges present in the system are taken into account, including the internal radiation through semitransparent materials. The effects of transparency of BaF2, CaF2 and sapphire crystals is discussed and the major importance of the knowledge of the physical phenomena is discussed.

Simulated lipoprotein transport in the wall of branched arteries
Darbeau MZ, Lutz RJ, Collins WE
ASAIO JOURNAL

46: (6) 669-678 NOV-DEC 2000

Abstract:
Study of arterial blood flow dynamics improves our understanding of the development of cardiovascular diseases such as atherosclerosis. The transport and accumulation of macromolecules in the arterial wall can be influenced by local fluid mechanics. We used numeric simulations to investigate such transport in a T-junction model. Presumably an in vitro experiment would consist of gel segments inserted in the walls of a mechanical flow T-junction model near branch points where separation and recirculation zones are expected. The transport of low density lipoprotein (LDL) was investigated theoretically at these sites in a two dimensional numeric T-branch model. In the numeric model, the hydraulic conductivity of the porous gel wall segments was varied for a fixed species diffusivity to provide simulations with wall transmural Peclet numbers ranging from 0.3 to 30. Steady state flow patterns in the lumen of the two dimensional T-branch were simulated at Reynolds numbers of 250 and 500, using the software package FIDAP 7.61 to implement the finite element method. The simulations demonstrated that wall Peclet numbers greater than 1.0 were needed to achieve species concentration gradients within the wall that varied in the axial direction, thereby reflecting the influence of disturbed flow and pressure patterns in the lumen. As expected, the transmural concentration gradients were steeper when convection predominated. Blood flow in the lumen can influence the distribution of macromolecules in the arterial wall and needs to be investigated for the relevance to atherosclerosis.

Stelian C, Plaza JL, Barvinschi F, et al.

Thermo-hydrodynamic transient modeling of vertical Bridgman growth
J OPTOELECTRON ADV M 2: (5) 481-486 2000

Teverovskiy M, Manas-Zloczower I, Elemans P, et al.

Numerical simulations and experiments in a double-Couette flow geometry
INT POLYM PROC 15: (3) 242-254 SEP 2000

Marken F, Tsai YC, Coles BA, et al.

Microwave activation of electrochemical processes: convection, thermal gradients and hot spot formation at the electrode vertical bar solution interface
NEW J CHEM 24: (9) 653-658 2000

Mun S, Kim S, Choi C, et al.

Classification of fine size Ni powders using liquid sedimentation classifier with different internal structures
MET MATER-KOREA 6: (4) 365-371 AUG 2000

Lekes V, Dandul I

Using airflow modelling and spatial analysis for defining wind damage risk classification (WINDARC)
FOREST ECOL MANAG 135: (1-3) 331-344 SEP 15 2000

Georgiadou M, Mohr R, Alkire RC

Local mass transport in two-dimensional cavities in laminar shear flow
J ELECTROCHEM SOC 147: (8) 3021-3028 AUG 2000

Zhao CB, Hobbs BE, Muhlhaus HB, et al.

Numerical modelling of double diffusion driven reactive flow transport in deformable fluid-saturated porous media with particular consideration of temperature-dependent chemical reaction rates
ENG COMPUTATION 17: (4) 367-385 2000

Huang Y, Gentle CR, Lacey M, et al.

Analysis and improvement of die design for the processing of extruded plastic pipes
MATER DESIGN 21: (5) 465-475 OCT 2000

Guan X, Martonen TB

Flow transition in bends and applications to airways
J AEROSOL SCI 31: (7) 833-847 JUL 2000

Miller W, Rehse U, Bottcher K

Influence of melt convection on the interface during Czochralski crystal growth
SOLID STATE ELECTRON 44: (5) 825-830 MAY 2000

Bune AV, Sen S, Mukherjee S, et al.

Effect of melt convection at various gravity levels and orientations on the forces acting on a large spherical particle in the vicinity of a solidification interface
J CRYST GROWTH 211: (1-4) 446-451 APR 2000

Kumar R, Nivarthi SS, Davis HT, et al.

Application of the lattice-Boltzmann method to study flow and dispersion in channels with and without expansion and contraction geometry
INT J NUMER METH FL 31: (5) 801-819 NOV 15 1999

Wang CH, Li J, Teo CS, et al.

The delivery of BCNU to brain tumors
J CONTROL RELEASE 61: (1-2) 21-41 AUG 27 1999

Paik SH

RELAP5-3D multidimensional heat conduction enclosure model for RBMK reactor application
NUCL TECHNOL 128: (1) 87-102 OCT 1999

Masi M, Cavallotti C, di Muzio F, et al.

2D and 1D modeling of AMT barrel reactors for silicon deposition
J PHYS IV 9: (P8) 273-280 Part 1 SEP 1999

Boschert S, Danilewsky AN, Benz KW

Numerical simulation of the influence of the orbiters attitude on the mu g growth of InP : S crystals from an In solution during the EURECA-1 flight
J CRYST GROWTH 205: (1-2) 92-96 AUG 1999

Prikryl P, Cerny R, Havlik V, et al.

Deposition of waste water into deep mines
ENVIRONMETRICS 10: (4) 457-466 JUL-AUG 1999

Migliavacca F, de Leval MR, Dubini G, et al.

Computational fluid dynamic simulations of cavopulmonary connections with an extracardiac lateral conduit
MED ENG PHYS 21: (3) 187-193 APR 1999

Tangthieng C, Finlayson BA, Maulbetsch J, et al.

Heat transfer enhancement in ferrofluids subjected to steady magnetic fields
J MAGN MAGN MATER 201: 252-255 JUL 1999

Noble DR, Torczynski JR

A lattice-Boltzmann method for partially saturated computational cells
INT J MOD PHYS C 9: (8) 1189-1201 DEC 1998

Dantzig JA

Modeling solidification processes using FIDAP
CRYST RES TECHNOL 34: (4) 417-424 1999

Boschert S, Kaiser T

Use of labels and loops for the FIDAP mesh generation
CRYST RES TECHNOL 34: (4) 425-432 1999

Rehse U, Miller W, Bottcher K

Analysis of fluid flow and heat transfer in a gas phase crystal growth furnace
CRYST RES TECHNOL 34: (4) 441-448 1999