Improving Heat Transfer in Falling Film Evaporators in Food Industries

Some Data on Heat Transfer in Multiple Effect Evaporators

Heat transfer data from measurements covering 15 Roberts evaporator vessels at 3 mills (82 data sets total) is presented. Heat transfer coefficient (HTC) is plotted against brix, temperature, temperature difference ( At) and viscosity respectively. It is shown that the influnce of At on HTC cannot be deduced from this type of data. The pronounced difference in operating conditions between last ...

nonlinear modeling and cascade control design for multi effect falling film evaporators

Analysis of heat and mass transfer between air and falling film in a cross flow configuration

Heat and mass transfer between air and falling solution film in a cross flow configuration is investigated. Effects of addition of Cu-ultrafine particles in enhancing heat and mass transfer process are also examined. A parametric study is employed to investigate the effects of pertinent controlling parameters on dehumidification and cooling processes and their subsequent optimization. It is fou...

Heat Transfer Coefficient Correlations for Robert Juice Evaporators

CORRELATIONS FOR heat transfer performance in sugar factory juice evaporators are important for benchmarking and prediction of evaporator set performance. The correlation recently proposed by Broadfoot and Dunn (2007) (B&D) is examined and comparisons are made between it and formulae currently being used, in particular with the ‘Australian typical’ correlation, using data from Australian and ov...

Flow Boiling Heat Transfer in Microchannel Cold Plate Evaporators for Electronics Cooling

The local two-phase heat transfer coefficient is a critical parameter in the design of microchannel cold plate evaporators used in applications such as electronics cooling systems. Only a few past studies on microchannels have investigated the heat transfer characteristics over the entire vapor quality range and conflicting trends have been reported even in these studies. Therefore, the present...

A Model for Correlating Flow Boiling Heat Transfer in Augmented Tubes and Compact Evaporators

The additive model for the convective and nucleate boiling components originally suggested by Bergles and Rohsenow (1964) for subcooled and low-quality regions was employed in the Kandlikar correlation (1990a) for flow boiling in smooth tubes. It is now extended to augmented tubes and compact evaporators. Two separate factors are introduced in the convective boiling and the nucleate boiling ter...