Abstract
An experimental and numerical study has been made on convective heat transfer in coiled tubes. The experiments have been carried out for tube diameter/coil diameter ratios from 1 100 to 1 10 , Prandtl numbers from 10 to 500 and Reynolds numbers from 20 to 4000. The heat transfer has been studied for two boundary conditions: for a uniform peripherally averaged heat flux and for a constant wall temperature. Attention has been paid to the heat transfer in the thermal entry region as well as in the fully developed thermal region. The results obtained and the relations proposed could be explained from and are based on the flow behaviour.
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