Estudo termo-hidraulico em tubos com intensificadores de troca de calor / Study hidraulical-thermal in pipes with intensifiers of heat exchange

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

This study of change of heat appraised fundamentally in terms of coefficient of transfer of heat of the water in drainage in smooth tubes and with insert of spiral springs of circular and rectangular profile it was investigated in the present work. In that sense it was used a supported experimental mounted for such evaluation. The rehearsals were accomplished fixing the entrance temperature in the section of rehearsals in the order of 2,6°C. In the accomplishment of the rehearsals the mass flow of water varied in the interval among 0,50 to 0,310 kg/s corresponding to values of number Reynolds, Re, of the order from 2900 to 15000, respectively. The experimental results show that the tube with spiral spring with rectangular profile presented the best acting of the coefficient of transfer of heat, followed by the tube with spring with circular profile and of the smooth tube. For reduced values of number Reynolds the coefficient of transfer of heat for the three tubes was of the some order. The experimental results show that the load loss increased with the increment of the mass flow where the tube with spring with rectangular profile presented the largest values. In the analysis final to evaluate the term-hydraulic acting is ended that the tube with spiral spring with circular profile is a little larger than the tube with spring of rectangular profile. It was verified the results also obtained through the correlations, of Gnielinski and of Bergles comparing them with the results obtained experimentally

ASSUNTO(S)

enhancement tubos de calor heat pipes molas (mecanismo) loss of hoad heat transfer calor - transmissão

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