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Title:Optimizacija dovoda za vstop reakcijskega plina v USP napravo : diplomsko delo
Authors:ID Kandare, Domen (Author)
ID Lešnik, Luka (Mentor) More about this mentor... New window
ID Rudolf, Rebeka (Comentor)
Files:.pdf VS_Kandare_Domen_2021.pdf (1,84 MB)
MD5: 5364F1F893F0BC32024CE3DC0AE58F91
PID: 20.500.12556/dkum/74b890aa-0af8-4b89-aa20-82221d5cb703
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:V okviru diplomske naloge smo simulirali geometrijo dovoda na obstoječi napravi, kjer vstopa reakcijski plin (vodik) v reakcijsko cev naprave za ultrazvočno razpršilno pirolizo (USP) s pomočjo uporabe numeričnih metod. Pri tem vstopu vodika pride do mešanja z nosilnim plinom (dušik). USP naprava je sestavljena iz evaporacijske ter dveh reakcijskih con enakih dolžin, v katero vstopa aerosol s perkurzorsko spojino. V začetnem delu smo izvedli eksperiment na USP napravi tako, da smo za vstopne parametre izbrali tiste, ki so bili teoretično najustreznejši: konstantni pretok vodika 5 L/min in tri različne pretoka dušika (5 L/min, 10 L/min in 15 L/min). V nadaljevanju smo izvedli validacijo z numerično simulacijo z uporabo programa ANSYS CFX. Geometrije modelov so bile izvedene z uporabo programa Solidworks. Vstopna geometrija dovoda vodika je vključevala študijo lege in radija vstopa dovoda glede na reakcijsko cev, kakor tudi študijo kota in premer dovoda. Pri simulaciji smo izbrali značilne pretoke obeh plinov v območju od 5 L/min do 15 L/min. Rezultati so pokazali, da je bila najboljša geometrija z dovodom reakcijskega plina od spodaj. V nadaljevanju smo v simulacijo osnovne geometrije z izbranimi pretoki plinov vključili še temperaturo tako, da smo v coni evaporacije upoštevali 150 °C, v ostalih dveh conah pa 400 °C. Rezultati študije so pokazali, da nam numerične simulacije predstavljajo ustrezno orodje za študij toka reakcijskega plina v UPS napravi, saj so dobljeni rezultati primerljivi z rezultati eksperimentalnih testiranj. Tako lahko numerične simulacije uporabimo za ustrezno ovrednotenje optimalne geometrije dovoda za vstop reakcijskega plina.
Keywords:USP naprava, vodik, dušik, mešanje plinov, računalniška dinamika tekočin, simuliranje tokov tekočin, AnsysCFX
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[D. Kandare]
Year of publishing:2021
Number of pages:IX, 44 str.
PID:20.500.12556/DKUM-79946 New window
UDC:532.5(043.2)
COBISS.SI-ID:80007939 New window
Publication date in DKUM:24.09.2021
Views:1054
Downloads:78
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Licences

License:CC BY-ND 4.0, Creative Commons Attribution-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nd/4.0/
Description:Under the NoDerivatives Creative Commons license one can take a work released under this license and re-distribute it, but it cannot be shared with others in adapted form, and credit must be provided to the author.
Licensing start date:24.08.2021

Secondary language

Language:English
Title:Optimization for reaction gas entry feed in a USP device
Abstract:As part of the diploma work we have simulated the geometry of the inlet on an existing device, where the reaction gas (hydrogen) enters into the reaction tube of the device for Ultrasonic Spray Pyrolysis (USP) using numerical methods. Mixing with the carrier gas (nitrogen) occurs at this entry of hydrogen. The USP device consists of an evaporation chamber and two reaction zones of equal length, into which an aerosol with a percursor compound enters. In the initial part we performed an experiment on a USP device in which we selected theoretically the most appropriate input parameters by selecting for the input parameters those that were theoretically the most appropriate: A constant hydrogen flow of 5 L/min and three different nitrogen flows (5 L/min, 10 L/min and 15 L/min). In the following, we performed validation with numerical simulation using the ANSYS CFX computational programme. The geometry of modelas was made using Solidworks programme. The geometry of the hydrogen inlet included a study of the position and radius of the inlet with respect to the reaction tube, as well as a simulation of the angle of attack and diameter of the inlet tube. In the simulation, we chose the typical flows of both gases in the range from 5 L/min to 15 L/min. The results showed that the best geometry was with the inlet of reaction gas at the bottom of the tube. Subsequently, the influence of temperature was included in the simulation of the basic geometry with chosen gas flows, by taking into account 150 °C in the evaporation zone, while the selected temperatures in the reaction zone were the same, i.e., 400 °C. The results of the study showed that the numerical simulations are appropriate method for determining flow condition of reaction gas in UPS device and can provide results with reasonable accuracy compared to the experimental tests. According to this they can be use then for evaluation of the optimal inlet geometry of reaction gas entry feed in an USP device.
Keywords:USP device, hydrogen, nitrogen, gas mixing, Computer Fluid Dynamics, fluid flow simulation, AnsysCFX


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