Department of chemistry, Norwegian University of Science and
Technology, Realfagbygget, D3, NO-7491 Trondheim, Norway
Telephone/fax: +47 73594179 / 47 73550788
My main research field is transport
theory and energy optimization. I am interested in understanding interacting fluxes of heat,
mass and charge, and chemical reactions, and how energy can be converted in the
most efficient way in industrial systems. I am currently writing a book on Nonequilibrium
Thermodynamics for transport in systems where the surface plays an important role.
Examples of such systems are electrode surfaces in electrochemical cells,
membrane surfaces in separation technology and liquid/wapour surfaces for instance
in distillation. Simulations are used to investigate the nature of the lost
work in the irreversible processes.
A three-dimensional snapshot of gas/liquids particles in a temperature gradient
of 10exp8 K/m. Coefficients of transport and entropy production rates are of
New theories are derived and I am very interested in their practical applications;
for instance in fuel cells (cf. Anne-Kristine
Meland), (cf. Preben J.S. Vie), phase transitions (see snapshot above), distillation
(cf. Audun Røsjorde
reactor modelling (cf. Lars Nummedal),
and (cf. Eivind Johannessen) and the
environmental effects of industrial activity (cf. Anita Zvolinschi)
Student projects in my group are related for instance to these activities.
- Fuel Cells
- Energy Efficient Processes
- High Temperature Systems
- Post Doctoral Fellows, Guests
- Doctor Students
- Short CV and Publications Last Years
We collaborate with groups in Finnland, Denmark, and Sweden on fuel
cell membrane studies and developments.
Our fuel cell test station makes us attractive for collaboration. We
have also long term contacts to Tsukuba Science Center in Japan,
and to Los Alamos, National laboratory, USA.
Schematic picture of the fuel cell.
transport charge across the membrane and react with oxygen to form
Our small laboratory cell can make a lego train move!
The thesis of Preben J.S. Vie (May 2002) documented a that the single cell operates
at non-isothermal conditions. Here is the temperature as function of position
and current density.
[Back to top]
- Energy Efficient
- The aim of this research is
to find the path of a process that produces a given amount of product with
the minimum energy cost. We study reactors that use natural gas as a reactant,
and hydrogen producing reactors. Hydrogen is necessary for fuel cells. We
have specified ideal boundary conditions for heat exchangers and designed
operating lines for distillation columns.
The result of our optimization
is that column heating should be performed in a different way than conventionally.
Typical example of equations that need be solved: eksempel.pdf
Here is the summary and introduction, taken from two of our articles:
Here is the group working on energy efficient process design on the
Onsager workshop in Leiden, 2000. From left to right: Erik Sauar, Lars
Nummedal, Dick Bedeaux, Signe Kjelstrup, Eivind Johannessen, Audun
Røsjorde, Gelein de Koeijer.
- High Temperature
- Studies of thermogalvanic
cells are interesting both from a theoretical and a practical stand point.
We have over the years studied the description of thermocells, in particular
the transported entropy in these cells. In electrolysis cells, thermoelectric
effects may lead to local heating or cooling of electrode regions. This can
be seen from the figure below. When electric current is passing a cell with
two aluminium electrodes, the temperature rises in the cathode, and decreases
in the anode, porportional to the current used. This knowlegde may have a
bearing on thermal modelling of electrolysis cells.
[Back to top]
Guests, Post Doctoral Fellows
Dr. Jianchu Qian, China 1998/99
Dr. Perumal Pugazhendi, India, 1999
Ass.prof. Dr. Monica Costea, Romania, 2000
Prof. Dr. Torben Smith Sørensen, Denmark, 2000
Dr. Mikael Paronen, Finnland, 2000-2002
Prof. Dr. C. Jesudason, Malaysia, 2001
Prof. Dr. M. Rubi, Spain, 2001
[Back to top]
Recent Ph.D's Graduated from the Group
- Magnar Ottøy
- Steffen Møller-Holst
- Belinda Flem
- Erik Sauar
- Ellen Marie Hansen
- Lars Nummedal
- Preben J.S. Vie
- Gelein de Koeijer
- Audun Røsjorde
Ph.D's in Progress
- Anne-Kristine Meland
- Thor Anders Aarhaug
- Eivind Johannessen
[Back to top]
Short CV and
Publications Last Years
Short CV, Signe Kjelstrup,
professor dr.techn. et dr.ing., group leader
The Nansen foundation award for young scientists, 1980,
Honorary professor University of North East China, Shenyang,
Invited guest professor to Kyoto University, Dept. of Fundamental
Energy Science, 2000
Editorial Board of J. Non-Equilibrium Thermodynamics,
Energy - The International Journal, and J. Applied Thermodynamics"
Board member Int. Soc. Applied Thermodynamics, Advisory board for
ECOS since 1999.
Referee to Acta Chem. Scand., J. Phys. Chem., J. Non-Equilibrium
Thermodyn., J. Electrochem. Soc., Electrochim. Acta, etc.
Publications in Referred
Journals since 1996
My last publications can
be found in the university library file FORSKDOC
[Back to top]
Research - Teaching,
Textbooks - Industrial Contacts - Scientific
and Personal Links - Work in Our Group?
Web design © Sven B. Ryen, 1999.
All rights reserved. Content & copy; Signe Kjelstrup.