3133 KB33 KB199920252014Edelbauer, WilfriedHriberšek, MatjažKopun, RokŠkerget, LeopoldZhang, Dongshengletnik:60številka:9str. 571-580, SI 104ISSN:0039-2480COBISSID:13699355URN:URN:NBN:SI:doc-DL9LWSLDenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikCFDgašenje aluminijastih litih delovLeidenfrost temperaturavečfazni tokNumerical investigations of quenching cooling processes for different cast aluminum parts|This paper discusses a recently improved computational fluid dynamics (CFD) methodology for virtual experimental investigation of the heat treatment for cast aluminium parts. The immersion quenching process of the heated work piece in a sub-cooled liquid pool is handled by employing the Eulerian multi-fluid modeling approach, which is implemented within the commercial CFD code AVL FIRE. The applied heat and mass transfer rate is modeled based on a different boiling regime, which is controlled by the Leidenfrost temperature. The objective of the presented research is to present an updated quenching model by applying variable Leidenfrost temperatures . Furthermore, simulation results are compared with available measurements for a wide variety of quenching scenarios involving immersion cooling of the step plate and real cylinder head with different solid parts' orientations. The temperature histories predicted by the presented model fit very well with the available experimental data at different monitoring locationsOptimizacija prenosa toplote v avtomobilistični industriji je eden izmed ključnih dejavnikov, ki pripomore k zmanjšanju porabe goriva in znižanju emisij izpustnih sistemov. Učinkovite metode toplotne obdelave, kot je proces gašenja, se uporabljajo pri nadomestitvi delov iz težjih kovin z lažjimi zlitinami (npr. aluminijastimi), kar pripomore k zmanjšanju teže vozila in posledično vpliva na znižanje porabe goriva in emisijskih vrednosti. Proces gašenja s potapljanjem v tekoči fazi je tako eden izmed najpomembnejših industrijskih procesov v avtomobilistični industriji, saj igra prenos toplote ključno vlogo pri določitvi strukturne in mehanske lastnosti materiala (npr. glave motorja). Za dosego želene lastnosti materiala, surovec najprej segrejemo na zelo visoko temperaturo, nato pa ga naglo ohladimoTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo