• Milada L Pezo, Laboratorija za termotehniku i energetiku, Institut za nuklearne nauke Vinča, Univerzitet u Beogradu, Srbija
  • Vladimir D. Stevanović, Univerzitet u Beogradu, Mašinski fakultet, Srbija

Numerička simulacija krize ključanja za slučaj bazenskog ključanja primenom modela dva fluida

  • U ovom radu je predstavljena numerička simulacija bazenskog ključanja da bi se odredile kritične vrednosti toplotnog fluksa. Za simulaciju je korišćen nestacionarni model dva fluida. Zagrejački zid je modeliran preko kondukcije. Dinamika rasta mehura na zagrejačkoj površini se modelira preko parametara mikro nivoa: gustine centara nukleacije i vremena zadržavanja mehura na zagrejačkoj površini. Zagrejačka površina je podeljena na zone, gde broj zona zavisi od gustine centara nukleacije, dok je lokacija centra nukleacije određena funkcijom slučajnih brojeva. Kritičan toplotni fluks se javlja kada para prekrije određenu zagrejačku površinu što dovodi do naglog rasta tem per a ture zida. Parni sloj sprečava kontakt vode i zagrejačke površine i formiranje mehurova. Dolazi do zasušenja zagrejačke površine i do pojave krize ključanja. Rezultati simulacije pokazuju da se sa smanjenjem hrapavosti površine smanjuju i vrednosti kritičnog toplotnog fluksa. Pokazano je dobro slaganje između rezultata simulacije i raspoloživih eksperimentalnih rezultata. Ovaj pristup je originalan zbog korišćenja modela dva fluida za modeliranje dvofazne mešavine za predviđanje krize ključanja i zbog zadavanja graničnih uslova na zagrejačkoj površini zida.

  • Ključne reči
  • Stranice
    303 - 315
  • Datum slanja
    11/19/2012
  • Datum revizije
    03/08/2013
  • Datum prihvatanja
    03/21/2013
  • BIBLID
    0350-218X, 38 (2012), 3, 303-315
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