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Title:Analiza uporabe nanotekočin v toplotnih prenosnikih : magistrsko delo
Authors:ID Špiler, Andrej (Author)
ID Ravnik, Jure (Mentor) More about this mentor... New window
ID Kamenik, Blaž (Comentor)
Files:.pdf MAG_Spiler_Andrej_2024.pdf (9,81 MB)
MD5: 4A4B68CB3F77DDB45A6108717EA47356
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:V magistrskem delu je obravnavana simulacija toplotnega prenosnika v krožni zanki, v katerem je nanotekočina. Nanotekočina je stabilna suspenzija majhnih delcev v nosilni tekočini. V magistrskem delu je nosilni medij voda, v kateri so nanodelci Al2O3. Simulacija se je izvedla v programskem paketu Ansys Fluent. Geometrija toplotnega prenosnika je bila narejena po toplotnem prenosniku, uporabljenem pri eksperimentu, ki sta ga izvedla Cobanoglu in Haktan Karadeniz v delu ''Effect of nanofluic thermophysical propertis on the performance prediciton of single-phase natural ciculation loops'' [1]. Za opis snovnih lastnosti nanotekočin, ki so temperaturno in koncentracijsko odvisne, se je uporabil UDF (User Defined Function). Gibanje in obnašanje nanodelcev v tekočini se je v programski paket Ansys Fluent vstavilo kot UDS (User defined Scalar). Rezultati cevi premera 4,75 mm so se primerjali z rezultati iz eksperimenta [1] pri toplotnih močeh 10, 30 in 50 W. Naknadno so se naredile simulacije za premere 3, 4, 5 in 6 mm ter pregledal se je izkoristek glede na večanje koncentracije nanodelcev. Rezultati so pokazali, da se z višanjem koncentracije nanodelcev veča izkoristek toplotnega prenosnika in manjša hitrost tekočine.
Keywords:prenos toplote, toplotni prenosniki, nanodelci, nanotekočine, Ansys Fluent, UDF, UDS
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[A. Špiler]
Year of publishing:2024
Number of pages:1 spletni vir (1 datoteka PDF (XII, 99f.))
PID:20.500.12556/DKUM-87357 New window
UDC:536.24:532.542(043.2)
COBISS.SI-ID:192248835 New window
Publication date in DKUM:03.04.2024
Views:253
Downloads:48
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:12.03.2024

Secondary language

Language:English
Title:Analysis of use of nanofluids in heat exchangers
Abstract:The masters thesis focuses on simulating a heat exchanger in a circular loop operated by nanofluid using a Computational Fluid Dynamics software package Ansys Fluent. Nanofluid is a stable suspension of small particles in the base fluid. In the thesis, the base fluid is water containing Al2O3 nanoparticles. The geometry of the heat exchanger was designed based on the one used in the experiment conducted by Cobanoglu and H. Karadeniz in their work ''Effect of nanofluic thermophysical propertis on the performance prediciton of single-phase natural ciculation loops'' [1]. User Defined Functions (UDF) were employed to describe the material properties of nanofluids which are temperature and concentration dependent. The movement and behavior of nanoparticles in the fluid were incorporated into Fluent as User-Defined Scalars (UDS). The results for a pipe diameter of 4.75 mm were compared with the experimental results [1] at heat powers of 10, 30 and 50 W. Subsequently, simulations were conducted for diameters of 3, 4, 5, and 6 mm, examining the efficiency with increasing nanoparticle concentration. The findings indicated that the heat transfer efficiency increases with higher nanoparticle concentrations and by increasing the velocity of the fluid decreases.
Keywords:heat transfer, heat exchangers, nanoparticles, nanofluid, ANSYS Fluent, UDF, UDS


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