Nucleate pool boiling of pure fluids

V nalogi smo obravnavali določitev koeficienta toplotne prestopnosti pri mehurčkastem vrenju čistih snovi. Vrenje je eno najbolj učinkovitih in tehnično obvladljivih mehanizmov prenosa toplote. Izdelali smo primerjavo med sedmimi različnimi metodami določitve koeficienta toplotne prestopnosti pri mehurčkastem vrenju čistih snovi. V delu smo obravnavali mehurčkasto vrenje 57 različnih čistih snovi s 1126 izmerjenimi vrednostmi koeficientov toplotne prestopnosti pri mehurčkastem vrenju. Poleg analizirane reducirane tlačne odvisnosti smo vpeljali tudi reducirano temperaturno odvisnost koeficienta toplotne prestopnosti pri mehurčkastem vrenju. Pri tem reduciran tlak predstavlja kvocient tlaka nasičenja in kritičnega tlaka in reducirana temperatura predstavlja kvocient temperature nasičenja in kritične temperature. Izvedena analiza kaže obetavno možnost uporabe reducirane temperaturne funkcije za določitev koeficienta toplotne prestopnosti pri mehurčkastem vrenju.This work investigates the determination of heat transfer coefficient in nucleate pool boiling of pure fluids. Boiling is one of the most effective and technically manageable mechanisms of heat transfer. The comparison between seven different methods for determination of heat transfer coefficient in nucleate pool boiling of pure substances was made. This work investigates the nucleate pool boiling of 57 different pure fluids with 1126 measured values of the heat transfer coefficient. In addition to the analysed reduced pressure dependency we introduced the reduced temperature dependency of the heat transfer coefficient in nucleate pool boiling. The reduced pressure represents the quotient of saturation pressure and critical pressure, while reduced temperature represents the quotient of saturation temperature and critical temperature. The performed analysis shows promise in using reduced temperature to determine the heat transfer coefficient in nucleate pool boiling