28 KB404 KB28 KB199920252004Neimarlija, NagibNeimarlija, Namirštevilka:12letnik:508 stranistr. 623-630ISSN:0039-2480COBISSID:7895579URN:URN:NBN:SI:doc-AQAD5XJVenslAssociation of Mechanical Engineers and Technicians of Slovenia et al.Zveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikcevikotli parnimetode numeričneprenos toploteuparjalnikiNumerična simulacija toka delovne tekočine v razpoki stene cevi uparjalnikove membrane parnega kotla| Numerical simulation of working-fluid flow cut in a tube of a steam-boiler membrane-wall evaporator|This paper presents the problem of transient heat transfer and the stress in the tube of a steam-boiler membrane-wall evaporator, assuming a sudden cut of the working-fluid flow through one of its tubes. Thus, an extreme case was considered in which the convective heat transfer from the tube wall to the working fluid was suddenly cut. The 2D analysis was carried out using a finite-volume method and with the assumption that the material is a thermo-elastic continuum. The analysis showed that the critical stress values were achieved relatively quicklyPrispevek prikazuje problem neustaljenega prenosa toplote in napetosti v cevi stene uparjalnikove membrane parnega kotla s predpostavko nenadne zaustavitve toka delovne tekočine skozi eno od njegovih cevi. Gre za skrajen primer, v katerem je konvektiven prenos toplote s stene cevi na delovno tekočino nenadnoustavljen. Opravljena je dvorazsežna analiza z metodo končnih prostornin ob predpostavki, da je material termoelastično zvezno telo. Analizaje pokazala razmeroma hitro dosego kritične vrednosti napetostiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo