Abstract
An experimental facility is designed and operated for investigating the hydrodynamic and heat transfer characteristics of bubble columns in two-phase (gas—liquid) systems operating in the semi-batch and continuous modes. The results are presented for the air—water system as a function of system and operating parameters. In particular, the average and local air hold-up and heat transfer coefficient between an electrically heated cylindrical probe and air—water dispersion are reported. These results are compared with the available correlations and models. Heat transfer rate and the local temperature of a probe element is measured as a function of time and these are interpreted to shed light on the mechanism of heat transfer between an immersed surface and a two-phase dispersion in the bubbling and churn-turbulent flow regimes.
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