Analiza uporabe nanotekočin v toplotnih prenosnikih

magistrsko delo

Andrej Špiler (Author), Jure Ravnik (Mentor), Blaž Kamenik (Co-mentor)

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;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2024
Typology:	2.09 - Master's Thesis
Organization:	UM FS - Faculty of Mechanical Engineering
Publisher:	[A. Špiler]
UDC:	536.24:532.542(043.2)
COBISS:	192248835
Views:	52
Downloads:	14
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Analysis of use of nanofluids in heat exchangers
Secondary 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.
Secondary keywords:	heat transfer;heat exchangers;nanoparticles;nanofluid;
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za strojništvo, Energetsko, procesno on okoljsko strojništvo
Pages:	1 spletni vir (1 datoteka PDF (XII, 99f.))
ID:	23122835