Efeito da geometria na ebulição nucleada de refrigerantes halogenados em tubos horizontais / Geometry effects in nucleate boiling of halocarbon refrigerants in horizontal tubes

AUTOR(ES)

Evandro Fockink da Silva

DATA DE PUBLICAÇÃO

2005

RESUMO

The research reported herein is a theoretical and experimental investigation of nucleate boiling heat transfer in an isolated tube and a row of three horizontal tubes. The literature review provided enough information to raise the intervening physical parameters and several correlations. The experimental bench has been developed and adapted to perform experiments with several refrigerants, three different tube diameters, and to accommodate a row of three parallel tubes. The experiments have been carried out with refrigerants R-11, R-123 and R-134a. Heating of the brass tubes has been provided by tubular electrical heaters inserted inside the tubes. The heat flux varied from 1 to 40 kW/ M POT.2 . Experiments have been carried out by successively heating two and three tubes. Effects of boiling in tubes underneath (lower level) have been investigated. Finally a correlation for the heat transfer coefficient in successive tubes of a tube bank has been developed. The correlation presents good accuracy with respect to data from the present investigation.

ASSUNTO(S)

heat transfer transferência de calor tube bank refrigerantes halogenados ebulição nucleada halocarbon refrigerants nucleate boiling banco de tubos

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