Forced convective boiling

From Thermal-FluidsPedia

Flow Regimes in Horizontal and Vertical Tubes

The two most common configurations in practical applications are convective boiling in horizontal tubes and upward flow boiling in vertical tubes. The flow regimes and heat transfer correlations for these two configurations are different and will be discussed separately.

See Main Article Flow Regimes in Horizontal and Vertical Tubes

Heat Transfer Predictions for Forced Convective Boiling

The different flow regimes have significant effects on the heat transfer characteristics of convective boiling in a tube. While heat transfer for subcooled liquid and superheated vapor can be easily handled by correlations for single-phase heat transfer, the intermediate heat transfer mechanism is complicated by phase change from liquid to vapor. After boiling is initiated in the tube, vapor bubbles are generated at certain nucleate sites while the rest of the inner surface of the tube remains in contact with the liquid. Under these conditions, the heat transfer mechanism is a combination of two parallel processes: single-phase convection in the liquid and nucleate boiling.

See Main Article Heat Transfer Predictions for Forced Convective Boiling.

References

Faghri, A., and Zhang, Y., 2006, Transport Phenomena in Multiphase Systems, Elsevier, Burlington, MA