Values of friction factor for flow in cooled vertical tubes have been obtained from experiments with a natural circulation system. The working fluids were water and water-ethylene glycol mixtures. The Reynolds number was varied between 25 and 6500 and the Rayleigh number was independently varied between limits of 180 and 6500. The friction factor, which was correlated with the Reynolds number, indicated flow resistance several times greater than that predicted by isothermal friction laws. © 1980.
|Number of pages||7|
|Journal||Letters in Heat and Mass Transfer|
|Publication status||Published - Jul 1980|