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Using Temperature Signals to Estimate Geometry Parameters in Fractured Geothermal Reservoirs

F. Maier[1], P. Oberdorfer[1], I. Kocabas[2], I. Ghergut[1], M. Sauter[1]
[1]Dpt. Applied Geology, Center of Geosciences, Georg-August-University, Göttingen, Germany
[2]Petroleum and Natural Gas Engineering Department Batman, Batman University, Batman, Turkey

We compare the output of 2D single fracture models as well as analytical solutions of the problem. The temperature signal is evaluated with the heat transfer mode while the flow field is assumed to exhibit Darcy flow everywhere. The problem is time-dependent so we have to take into account a change in the boundary conditions from a Dirichlet to a Neumann condition which is activated at the time ...

Geometric Optimization of Micromixers

M. Jain[1], A. Rao[1], K. Nandakumar[1]
[1]Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, USA

The performance of a homogeneous T-mixer can be enhanced significantly by the stimulation of secondary/ transverse flows in the microchannel. Various mixing mechanisms are reported for enhancing micromixing performance such as grooves at the channel bottom, heterogeneous charge patterns etc. Most of these micromixers are studied with respect to planar geometric parameters such as groove width, ...

Multiphysics Approach of the Performance of a Domestic Oven

N. Garcia-Polanco[1], J. Capablo[1], J. Doyle[1]
[1]Whirlpool Corporation, Cassinetta di Biandronno (VA), Italy

The heat and mass transfer processes occurring in a domestic oven is in detailed analyzed in this work, with the final objective of improving the global energy efficiency of the system. A 3D Finite Element model developed with a Multi-physics approach is validated with the experimental data from the standard test for energy consumption of the European Union (EN 50304:2001). In this test a brick ...

Comparison of Heat and Mass Transport at the Micro-Scale

E. Holzbecher[1], S. Oehlmann[1]
[1]Georg-August Universität Göttingen, Göttingen, Germany

Phenomena of heat and mass transfer are often compared, in various porous media applications. Questions of practical interest are, for example, if tracers can be used for the prediction of heat flow, or vice versa if heat can be utilized as, possibly retarded, tracer for predicting the migration of contaminants, nutrients or other substances. Using numerical modelling in artificial porous media ...

Actively Controlled Ionic Current Gating In Nanopores

G. Zhang[1], S. Bearden[1]
[1]Clemson University, Clemson, SC, USA

It is necessary to understand and control nanopore behavior in order to develop biosensors for a variety of applications including DNA sequencing. The fluidics of nanopore devices we fabricated exhibits a range of interesting phenomena, such as enhanced conductance and current rectification. By electrically biasing nanopores, we were able to actively control the nanopore conductance in real time ...

3D COMSOL Multiphysics® Model of a Plate Heat Exchanger to Support a Laboratory Teaching Environment - new

N. Medeiros[1], W. Clark[1]
[1]Worcester Polytechnic Institute, Worcester, MA, USA

Chemical engineering students and practitioners need an understanding of fluid flow and heat transfer inside heat exchangers. Because the flow within plate heat exchangers is difficult to visualize, we developed COMSOL Multiphysics® simulations of plate heat exchangers for students to study alongside a physical heat exchanger in a laboratory setting. Simulative experiments allow students to ...

Finite Element Study of the Mass Transfer in Annular Reactor - new

Y. M. S. El-Shazly[1], S. W. Eletriby[1]
[1]Alexandria University, Alexandria, Alexandria, Egypt.

The annular reactor is a very useful design to carry many chemical reactions. In this study, COMSOL Multiphysics® software was used to study the isothermal mass transfer from the inner side of the outer tube of the annular reactor in the range of 200

Numerical and Experimental Investigation of Natural Convection Flow of (Sub-) and (Super-) Critical CO2 in Aqueous Phase

R. Khosrokhavar[1], G. Elsinga[1], R. Farajzadeh[2], H. Bruining[1]
[1]Delft University of Technology, Delft, The Netherland
[2]Shell International Global Solutions, Amsterdam, The Netherland

Optimal storage of carbon dioxide (CO2) in aquifers requires dissolution in the aqueous phase. Transfer of CO2 from the gas phase to the aqueous phase or oil phase would be slow if it were only driven by diffusion. Dissolution of CO2 in brine (oil) forms a mixture that is denser than the original brine. This causes a local density increase, which induces natural convection currents accelerating ...

A Theoretical Model for the Control of Color Degradation and Microbial Spoilage Occurring in Food Convective Drying

S. Curcio[1], M. Aversa[1]
[1]University of Calabria, Department of Engineering Modeling, Rende, Cosenza, Italy

The aim of this work was the development of a predictive model aimed at identifying a proper control strategy of food drying process. In particular, it was intended to determine the effect of operating conditions both on the color degradation, chosen as a reference quality parameter, and on the microbial spoilage occurring during potatoes drying. A transport model, accounting for the ...

Simulation Of A Hydrogen Permeation Test On A Multilayer Membrane

J. Bouhattate, E. Legrand, A. Oudriss, S. Frappart, J. Creus, and X. Feaugas
Laboratoire d’Etude des Matériaux en Milieu Agressif, LEMMA, Bat. Marie Curie, La Rochelle, France

To understand a metal susceptibility to Hydrogen Embrittlement (HE), it is important to quantify the diffusion of hydrogen through a metallic membrane. Electrochemical permeation tests are the most common methods for experimentally determining the diffusion coefficient of a metal. However the parameters directly accessible from experiments are the time required for a stream to be observed and ...