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NUMERICAL MODELING OF THE IMMERSION QUENCHING PROCESS USING AN EULERIAN MULTI-FLUID MODELING APPROACH
Rok Kopun, 2014, doktorska disertacija

Opis: Optimization of heat transfer characteristics in automotive industries is one of the more important factors leading to reductions in fuel consumption and lower emissions values. Efficient heat treatment techniques, like immersion quenching, have been introduced in order to replace heavier metals with lower weight alloys (aluminum), which results in vehicle weight reduction and consequently improved fuel consumption and emission values. Immersion quenching is one of the more important heat treatment techniques introduced in automotive industries, where heat transfer plays a vital role in determining the structure and mechanical properties of the material (e.g. the cylinder head). This presented PhD thesis deals with the development and validation of improved computational methodology in order to simulate the heat transfer characteristics of the immersion quenching cooling process, as implemented within the commercial computational fluid dynamics (CFD) code AVL FIRE®. The boiling phase change process between the heated part and a sub-cooled liquid domain is handled by using the Eulerian multi-fluid modeling approach, where each phase is treated as interpenetrating continua. While for the fluid domain mass, momentum and energy equations are solved within the content of the multi-fluid modeling approach, where only the energy equation is solved to predict the thermal field within the solid region. Result comparisons between the measurements and corresponding numerical simulations using the variable Leidenfrost temperature with additional interfacial forces showed very good agreement. The comparisons were performed on an aluminum step-plate test piece with different thicknesses along its length and on a simplified aluminum cylinder head structure. The specimens were submerged within the liquid domain at different pool temperatures and different solid part orientations, where the solid temperature histories predicted by the numerical model correlated very well with the provided measurement data.
Ključne besede: CFD, Multiphase boiling, heat transfer, quenching, Leidenfrost temperature, interfacial forces, results comparison
Objavljeno: 14.08.2014; Ogledov: 1081; Prenosov: 139
.pdf Celotno besedilo (6,07 MB)

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InVance sling postopek za zdravljenje moške stresne urinske inkontinence
Dejan Bratuš, Gregor Hlebič, 2011, izvirni znanstveni članek

Opis: Namen: Stresna inkontinenca urina je pri moških relativno redka in se pojavi kot posledica večjega operativnega posega, drugi vzroki stresne inkontinence urina se pri moških pojavljajo izjemoma. Ne glede na relativno majhno število prizadetih takšno uhajanje urina obolelim predstavlja velik medicinski in tudi socialni problem, saj se odpovejo normalnim dnevnim aktivnostim in se vse bolj omejujejo na domače okolje. Metode: Ena izmed možnosti zdravljenja stresne urinske inkontinence pri moških je tako imenovani InVance Male Sling sistem. Gre za minimalno invazivno kirurško metodo, pri kateri se na spodnjo stran pubične kosti z vijaki pritrdi poliesterska mrežica, ki tesni sečnico. V principu gre za sling operacijo. Rezultati: Na našem oddelku smo med letoma 2004 in 2007 z omenjeno prometodo zdravili osemintrideset bolnikov. Pri štiriintridesetih je šlo za stanje po radikalni odstranitvi prostate, pri štirih pa za stanje po transuretralni resekciji prostate. Čas spremljanja po posegu je pri vseh daljši od dveh let. Osemindvajset bolnikov navaja popolno ozdravitev (brez uporabe predlog), šest bolnikov navaja blago stresno inkontinenco (ena predloga dnevno), pri štirih bolnikih pa ni prišlo do izboljšanja. Pri nobenem bolniku nismo opažali zastoja urina ali na novo nastalih težav pri uriniranju, smo pa pri treh bolnikih srečali podaljšano gnojno izcejanje iz postoperativne rane in še pri treh kasno zavrnitev mrežice, zato smo pri teh bolnikih morali mrežico odstraniti. Imeli smo tudi bolnika z erozijo sečnice osem mesecev po posegu. Zaključek: Glede na naše rezultate lahko zapišemo, da je Invance sling operacija uspešna metoda zdravljenja moške stresne inkontinence urina z minimalnimi pooperativnimi zapleti.
Ključne besede: male urinary stress incontinence, sling procedure, minimally invasive procedure, treatment results, postoperative complications
Objavljeno: 10.07.2015; Ogledov: 718; Prenosov: 17
URL Povezava na celotno besedilo

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Business system: sustainable development and anticipatory systems thinking
Vojko Potočan, Matjaž Mulej, 2002, izvirni znanstveni članek

Opis: The existence and development of humankind depends a lot upon a co-ordinatet operation of all areas and levels of human activity. However, in either theory or practice we found no model of operation, which would offer a harmonized and target oriented development. A possible solution is offered by sustainable development, which tries to the define and carry out common goals of human kind with a holistic harmonization of humans activities at all levels of their living and behaviour. Companies belong to central institutions of the modern society and assentially co-create the sustainability of society. Companies endeavour (e.g. by simulation and planning) to prepare models of their goals and ways concerning their internal and external environment. On the basis of systems approach, we can define companies as business systems, which can best survive in a log-run on the basis of sustainable development. This business system's effort can also be supported by the application of the ancipatory systems thinking which can improve its planning methods, if it is holistic, understood as a future oriented mental activity made of its methodological approach, techniques, and modes of work. Its characteristics have a direct impact of holism of the definition of goals, on the orientation of operation, and hence achievement of the business system's results.
Ključne besede: business systems, sustainable development, development, models, business, planning, business planning, results
Objavljeno: 04.07.2017; Ogledov: 232; Prenosov: 53
.pdf Celotno besedilo (379,96 KB)
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