Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Announcement<br />
regarding a paid<br />
<strong>diploma</strong> <strong>thesis</strong><br />
with the tentative title<br />
Two-phase heat & mass transfer in small-bore tubes<br />
The Announcement is addressed to students of the branch of studies Technische<br />
Physik and the MSc. program Physikalische Energie- und Messtechnik, who are<br />
interested in finishing their studies with a multidisciplinary <strong>diploma</strong> <strong>thesis</strong>.<br />
Primary Objective<br />
Optimization of 2-phase aircoils in a compression-absorption chiller<br />
Project Description<br />
Small-bore heat exchangers are preferable particularly for CO2, NH3 and hydrocarbon<br />
heat pumps, where a small volume-to-surface ratio is required to withstand extremely<br />
high pressure or minimize refrigerant charge due to its toxicity and/or flammability.<br />
N2 bottle<br />
volume<br />
flowmeter V<br />
needle valve<br />
acrylic tube<br />
H<br />
el. heater<br />
entrance<br />
water-glycol<br />
3-way vv<br />
DB temperature<br />
WB temperature<br />
hi-speed<br />
camera<br />
diff. press. gauge<br />
2nd fluid<br />
Δp<br />
M<br />
mass flowmeter<br />
separator<br />
(a) Schematic diagram (b) Bubble flow image<br />
(Atserios Gavriilids, Univ. College London)<br />
In the current research project, a hybrid ammonia absorption-compression refrigeration<br />
machine is being developed. One of its goals is to develop high-performance small-bore<br />
aircoil heat exchangers for condenser, absorber and evaporator. The task will be carried<br />
out in both theoretically and experimentally. Fig. 1 shows a schematic diagram of a test<br />
setup where heat and mass transfer characteristics of bubble flows will be measured and<br />
observed in small-bore tubes. Experiments with this setup and a parallel CFD simulation<br />
(which will be performed primarily by staff members of the research group) will<br />
complement each other to provide a full-range design database for two-phase small-bore<br />
aircoil heat exchangers.
The <strong>diploma</strong> <strong>thesis</strong> focuses on the experimental setup and tests with various<br />
experimental methods like high speed camera tests and measurements of global mean<br />
values such as flow rate and pressure drop. The various methods are used to<br />
characterize the size and velocity of the bubbles and the film thickness between bubble<br />
and the bore tube.<br />
Parts of the experimental setup as well as tests with the high speed camera can be part<br />
of a "Vorbereitungspraktikum" as required for the students program Technische Physik.<br />
Deliverables<br />
Flow maps, pressure drop and gas-liquid & liquid-tube heat and mass transfer<br />
correlations for various tubes and liquids.<br />
required skills<br />
• interest in flow phenomena and thermodynamics<br />
• basis knowledge in heat transfer and fluid dynamics<br />
• interest in physical modelling<br />
• good knowledge in physical measurement techniques (e.g. VO physikalischen Messverfahren)<br />
• technical skills (hands on hardware) required<br />
• Interest in mathematic and statistical models for data postprocessing<br />
• programming knowledge and computing skills<br />
For further information, please contact one of our project team.<br />
Duration of the <strong>diploma</strong> <strong>thesis</strong>: 6 months<br />
Start of the <strong>diploma</strong> <strong>thesis</strong>: as soon as possible<br />
The research work can be accomplished at arsenal research in Vienna.<br />
Institut für Festkörperphysik der<br />
Technischen Universität Wien<br />
Univ. Prof. Dr. Günter Wiesinger<br />
A-1040 Wien, Wiedner Hauptstrasse 8-10<br />
Tel.: +43 (0) 1 58801 13155<br />
Fax.: +43 (0) 1 58801 13199<br />
E-Mail: guenter.wiesinger@ifp.tuwien.ac.at<br />
www.ifp.tuwien.ac.at/institut/<br />
arsenal research<br />
Geschäftsfeld Nachhaltige<br />
Energiesysteme<br />
Dr. Michael Monsberger<br />
A-1210 Wien, Giefinggasse 2<br />
Tel.: +43 (0) 50 550-6231<br />
Fax.: +43 (0) 50 550-6613<br />
E-Mail:<br />
michael.monsberger@arsenal.ac.at<br />
www.arsenal.ac.at<br />
Contact<br />
arsenal research<br />
Geschäftsfeld Nachhaltige<br />
Energiesysteme<br />
Dr. Christoph Reichl<br />
A-1210 Wien, Giefinggasse 2<br />
Tel.: +43 (0) 50 550-6605<br />
Fax.: +43 (0) 50 550-6613<br />
E-Mail: christoph.reichl@arsenal.ac.at<br />
www.arsenal.ac.at
Change language