MCMFIT: Efficient optimal fitting of a generalized nonlinear advection-dispersion model to experimental data

1995 ◽  
Vol 21 (1) ◽  
pp. 61-76 ◽  
Author(s):  
K. Bajracharya ◽  
D.A. Barry
Keyword(s):  
Experimental Data ◽  
Dispersion Model ◽  
Advection Dispersion ◽  
Nonlinear Advection

Mass Transfer in Liquid in an Apparatus with Mobile Packing. Application of a Dispersion Model

1993 ◽  
Vol 58 (5) ◽  
pp. 1078-1086
Author(s):  
Zdeněk Palatý
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Empirical Equation ◽  
Dispersion Model ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients

The paper deals with the mass transfer in a liquid on a plate with mobile packing. A procedure has been suggested which enables estimation of the mass transfer coefficients from experimental data considering the dispersion flow of the liquid. The results obtained from the desorption of CO2 from water are presented graphically and in the form of empirical equation.

Prediction of Effectiveness and Heat Transfer Using a New 2-D Injection and Dispersion Model of the Film Cooling Process

1996 ◽  
Author(s):  
S. Neelakantan ◽  
M. E. Crawford
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Film Cooling ◽  
Flow Model ◽  
Dispersion Model ◽  
Cross Flow ◽  
Data Bases ◽  
New Model ◽  
Jet In Cross Flow ◽  
Injection Location

A new model is developed to predict laterally-averaged film cooling. At the injection location, the near-hole region is leapt over and the injectant is distributed according to an existing jet in cross flow model and experimental data. The subsequent dispersion of the injectant is simulated to reflect the augmented mixing and the 3-dimensionality of the flow field. The new model is calibrated to predict effectiveness and heat transfer using the experimental data bases of Schmidt et al. (1994), Sen et al. (1994), Kohli et al. (1994), and Sinha et al. (1991). The geometries include injection angles of 35° and 55° with compound angles of 0° and 60° and hole spacings of 3 and 6 diameters. The new model yields improved effectiveness predictions over previous 2-D models.

scholarly journals Seasonal Variation of Drainage System in the Lower Ablation Area of a Monsoonal Temperate Debris-Covered Glacier in Mt. Gongga, South-Eastern Tibet

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1050 ◽  
Author(s):  
Qiao Liu ◽  
Shiyin Liu ◽  
Wulong Cao
Keyword(s):  
Seasonal Variation ◽  
Dispersion Model ◽  
Drainage System ◽  
Hydrodynamic Dispersion ◽  
Ablation Area ◽  
Advection Dispersion ◽  
Dye Tracer ◽  
Eastern Tibet ◽  
Glacier Ice ◽  
Subglacial Drainage

Seasonal evolution of the subglacial drainage system in the lower ablation area of the Hailuogou glacier ice tongue were revealed by repeated dye tracer (Rhodamine WT) experiments during the 2009 ablation season. Between April and October, 18 dye tracer experiments were conducted by injecting the tracer at one location of the lower ablation area of the Hailuogou Glacier to diagnose the seasonal variation of the subglacial drainage system of this section of glacier ice tongue. Using a simple advection-dispersion model (ADM), the flow velocity, hydrodynamic dispersion coefficient, and degree of tracer spreading were deduced. Tracer transit velocity through the tested subglacial channel varied from 0.148 to 0.555 m s−1 during the 2009 ablation season. Dispersivity showed a relatively high value than that found at other glaciers, which varied between 27.05 and 287.49 m2 s−1. Seasonal changes of these indexes indicated that the subglacial drainage system of the lower ablation area of the Hailougou Glacier is a relatively stable existing system in the case of its longitudinal shape, whereas its hydraulic efficiency is low in the early and late ablation seasons and high during the middle of summer due to subglacial channel expansion.

scholarly journals Numerical Solution of a 3-D Advection-Dispersion Model for Dissolved Oxygen Distribution in Facultative Ponds

2018 ◽  
Vol 31 ◽  
pp. 03006 ◽  
Author(s):  
Sunarsih ◽  
Dwi P. Sasongko ◽  
Sutrisno
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Dispersion Model ◽  
Oxygen Distribution ◽  
Dissolved Oxygen Concentration ◽  
3 Dimensional ◽  
Advection Dispersion ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
The Finite Difference Method

This paper describes a mathematical model for the dissolved oxygen distribution in the plane of a facultative pond with a certain depth. The purpose of this paper is to determine the variation of dissolved oxygen concentration in facultative ponds. The 3-dimensional advection-diffusion equation is solved using the finite difference method Forward Time Central Space (FTCS). Numerical results show that the aerator greatly affects the occurrence of oxygen concentration variations in the facultative pond in the certain depth. The concentration of dissolved oxygen decreases as the depth of the pond increases.

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