A Lagrangian Reactive Transport Simulator with Successive Paths and Stationary-States: Concepts, Implementation and Verification

1989 ◽  
Vol 176 ◽  
Author(s):  
R. B. Knapp
Keyword(s):  
Reference Frame ◽  
Peclet Number ◽  
Software Package ◽  
Reactive Transport ◽  
Quantitative Agreement ◽  
Stationary States ◽  
Good Quantitative Agreement ◽  
Analytical Results ◽  
Single Path ◽  
Aqueous Species

ABSTRACTA geochemical software package which models static, single-path kinetic water-rock interactions, EQ3/6, has been modified to incorporate successive-paths and stationary states under high Peclet number transport conditions in a Lagrangian reference frame. These modifications permit calculation of reactive transport with reasonable computational requirements. Results from the new option in EQ3/6 have been compared with analytical results for the simple HC1 - SiO2 system; excellent agreements were achieved. Results have also been compared with published results for a portion of the A12O3 - HCI - K2O - SiO2 system. The results are in good qualitative and, in some cases, good quantitative agreement. However, the values of some variables differ substantially; these differences can be attributed to use of a different set of Al and Si aqueous species.

Steady streaming within a periodically rotating sphere

2008 ◽  
Vol 608 ◽  
pp. 71-80 ◽  
Author(s):  
RODOLFO REPETTO ◽  
JENNIFER H. SIGGERS ◽  
ALESSANDRO STOCCHINO
Keyword(s):  
Series Expansion ◽  
Oscillation Frequency ◽  
Small Amplitude ◽  
Quantitative Agreement ◽  
Torsional Oscillations ◽  
Rotating Sphere ◽  
Good Quantitative Agreement ◽  
Steady Streaming ◽  
Theory And Experiments ◽  
Streaming Flow

We consider the flow in a spherical chamber undergoing periodic torsional oscillations about an axis through its centre, and analyse it both theoretically and experimentally. We calculate the flow in the limit of small-amplitude oscillations in the form of a series expansion in powers of the amplitude, finding that at second order, a steady streaming flow develops consisting of two toroidal cells. This streaming behaviour is also observed in our experiments. We find good quantitative agreement between theory and experiments, and we discuss the dependence of the steady streaming behaviour as both the oscillation frequency and amplitude are varied.

Evolution of Matt Surface Topography in Aluminium Pack Rolling

2005 ◽  
Author(s):  
Hiroshi Utsunomiya ◽  
Michael P. F. Sutcliffe ◽  
Hugh R. Shercliff ◽  
Pete S. Bate ◽  
Dan B. Miller
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Surface Topography ◽  
Material Properties ◽  
Quantitative Agreement ◽  
Aluminium Foil ◽  
The Finite Element Method ◽  
Good Quantitative Agreement ◽  
Pack Rolling ◽  
Element Method

Roughening of the matt surface of pack rolled aluminium foil has been modelled. The model is based on the finite element method using isotropic plasticity. A distribution in material properties has been used to simulate the distribution of orientations through the material. The predictions of roughness show good quantitative agreement with the experiments.

scholarly journals The properties of torsional vibrations reciprocating engine shafts.— Part I

1926 ◽  
Vol 113 (764) ◽  
pp. 259-271 ◽  
Keyword(s):  
Quantitative Agreement ◽  
Engineering Practice ◽  
Torsional Vibrations ◽  
Reciprocating Motion ◽  
Numerical Accuracy ◽  
Reciprocating Engine ◽  
Refined Method ◽  
Analytical Results ◽  
The Subject ◽  
Set Up

In a previous paper by the writer an examination was made of the torsional vibrations occurring in a reciprocating engine shaft. The case studied was that of a shaft driven by a six-cylinder engine, all parts except the shaft being considered rigid. Certain interesting results, arising from the action of the reciprocating parts, appeared. On account of the importance of the subject of torsional vibrations in engineering practice, and on account of the unexpected nature of the analytical results, it was considered of some interest to examine in greater detail the effect of the reciprocating parts in producing or modifying the vibrations. For this purpose a model is proposed which, it is considered, is as simple as can be conceived, and which, at the same time, involves the characteristics of reciprocating motion. The model is described and the analytical results obtained in Part I of this paper. To verify the analysis, the model was set up in the laboratory and the vibrations observed. Further, to simplify the experimental work, it was thought sufficient for the purposes of verification to arrange it in the first place so as to give only a qualitative agreement with theory, and therefore a precise quantitative agreement was not aimed at, and should not be looked for. An experiment on a much more refined method is being proceeded with to examine minutely into the numerical accuracy of the theory. The details of the present experiment and the numerical results are given in Part II.

scholarly journals Capillary bridges between a plane and a cylindrical wall

2015 ◽  
Vol 773 ◽  
Author(s):  
Etienne Reyssat
Keyword(s):  
Numerical Solution ◽  
Quantitative Agreement ◽  
Horizontal Cylinder ◽  
Numerical Results ◽  
Planar Boundary ◽  
Cylindrical Wall ◽  
Good Quantitative Agreement ◽  
Capillary Bridges

We report experimental, theoretical and numerical results on the shapes of liquid menisci connecting a planar boundary and the surface of a horizontal cylinder placed above. The gradient of confinement traps the wetting drops in the most confined regions, which promotes their elongation along the line of smallest gap between the walls. The experimental shapes of these stretched capillary bridges are shown to be in good quantitative agreement with the numerical solution of the equation describing their contour. In particular, we show that the measured shapes are better described when taking into account the correction resulting from the coupling of in-plane and transverse interfacial curvatures calculated by Park & Homsy (J. Fluid Mech., vol. 139, 1984, pp. 291–308) over thirty years ago.

Automated and manual quantitative assays of choriogonadotropin in serum compared.

1987 ◽  
Vol 33 (1) ◽  
pp. 167-169 ◽  
Author(s):  
C J Beinlich ◽  
R H Carpenter
Keyword(s):  
Enzyme Immunoassay ◽  
Quantitative Agreement ◽  
Cross Reactivity ◽  
Analytical Performance ◽  
Good Quantitative Agreement ◽  
Correlation Studies ◽  
Automated Assay ◽  
Human Choriogonadotropin ◽  
Interassay Precision

Abstract We found the analytical performance of a rapid, automated assay of human choriogonadotropin (hCG) in serum, the Stratus hCG Fluorometric Enzyme Immunoassay, superior to a widely used manual assay for hCG (Hybritech Tandem-E hCG). The two assays were comparable in sensitivity; recovery; cross reactivity with lutropin, follitropin, and thyrotropin; and freedom from interference from hemoglobin and bilirubin. Patient-correlation studies indicated good quantitative agreement [Stratus hCG = (1.08 X Tandem hCG) - 4.3 int. units/L]. However, intra- and interassay precision was substantially better with the Stratus hCG assay, and this may allow earlier confirmation of pregnancy.

Scattering of acoustic waves into Tollmien-Schlichting waves by small streamwise variations in surface geometry

1985 ◽  
Vol 154 ◽  
pp. 509-529 ◽  
Author(s):  
M. E. Goldstein
Keyword(s):  
Boundary Layer ◽  
Acoustic Waves ◽  
Static Pressure ◽  
Quantitative Agreement ◽  
Qualitative Explanation ◽  
Surface Geometry ◽  
Acoustic Disturbance ◽  
Good Quantitative Agreement ◽  
Tollmien Schlichting ◽  
Scattering Of Acoustic Waves

By using the triple-deck scaling of Stewartson (1969) and Messiter (1970) we show that small but relatively sudden surface geometry variations that produce only very weak static pressure variations can nevertheless produce strong, i.e. 0(1), coupling between an externally imposed acoustic disturbance and a spatially growing Tollmien- Schlichting wave. The analysis provides a qualitative explanation of the Leehey & Shapiro (1979) boundary-layer receptivity measurements and is in good quantitative agreement with the Aizin & Polyakov (1979) experiment. It may also explain why small ‘trip wires’ can promote early transition.

scholarly journals PARTICLE IDENTIFICATION STUDIES WITH AN ALICE TEST TPC

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2457-2462 ◽  
Author(s):  
◽  
PETER CHRISTIANSEN
Keyword(s):  
Energy Loss ◽  
Theoretical Calculations ◽  
Quantitative Agreement ◽  
Particle Identification ◽  
Field Cage ◽  
Loss Distribution ◽  
Good Quantitative Agreement

Using a test TPC, consisting of the ALICE TPC field cage prototype in combination with the final ALICE TPC readout and electronics, the energy loss distribution and resolution were measured for identified protons. The measurements were compared to theoretical calculations and good quantitative agreement was found when detector effects were taken into account. The implications for particle identification are discussed.

Evaluation of alveolar amplitude response technique for determination of lung perfusion in exercise

1981 ◽  
Vol 50 (5) ◽  
pp. 1071-1078 ◽  
Author(s):  
S. C. Luijendijk ◽  
A. Zwart ◽  
A. M. van der Kooij ◽  
W. R. de Vries
Keyword(s):  
Venous Return ◽  
Human Subjects ◽  
Compartment Model ◽  
Quantitative Agreement ◽  
Experimental Results ◽  
Tracer Gas ◽  
Amplitude Response ◽  
Good Quantitative Agreement ◽  
Anesthetized Dogs

We investigated the influence of tracer gas venous return on the determination of pulmonary perfusion (Qp) using the alveolar amplitude response technique (AART) to evaluate the applicability of this technique at rest and during exercise. The venous return influence was calculated by a computer simulation applied to a simplified body compartment model. Using the AART method, which neglects the influence of venous return, a simulation based on acetylene as a tracer gas predicted an overestimation of the actual value of Qp ranging from 0 to 10% for all work loads investigated. These theoretical results were compared with experimental results. Experiments with human subjects with acetylene as the tracer gas yielded an underestimation of Qp of about 20% at rest and an overestimation of about 7% under different exercise conditions. Experiments with anesthetized dogs showed an underestimation of Qp of about 12% for acetylene and about 6% for halothane. The theoretical and experimental results related to exercise conditions are thus in good quantitative agreement. The experimental data obtained for acetylene with human subjects at rest and with anesthetized dogs are also in good quantitative agreement. However, they deviate considerably from theoretical predictions. This discrepancy may be due to the simplified body compartment model used in the calculations, which can considerably influence the calculated results, especially for conditions at rest. The main conclusion of this paper is that recirculating tracer gas does not unduly influence results for Qp obtained with the AART method when halothane is used as the tracer gas.

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