Study On The Characteristics Of Heat Transfer And Hydrodynamics Of Falling Film Evaporation In A Vertical Wavy Wall Tube

The wavy wall tube evaporator is a novel falling film evaporator which is improved on the vertical tube falling film evaporator, the main difference between them is using a wavy wall tube heating element to replace the vertical tube heating element. Heat transfer is enhanced because the falling film in the wavy wall tube is affected by the wave crest and through of the wavy wall. The theoretical analysis and experimental studies of the wavy wall tube evaporator are carried out in this paper.Different mathematical model is theorized according to the different flow regimes. In the laminar flow regime, a analytical mathematical model is obtained by analyzing the film flowing in the wavy wall tube. In the turbulent flow regime, mathematical model almost can't be obtained directly because the turbulent flow in wavy wall tube is very complex, the model is obtained by quoting some results which are theorized by other studiers.In the part of experimental study , the flow form in the wavy wall tube is observed by transparent quartz glass wavy wall tube apparatus, the evaporation experiments are carried out in a 3 meters steel wavy wall tube, using glucose as the medium, heat transfer is invested, the heat transfer correlations of wavy wall tube evaporator are obtained.The study shows that the theoretical models are in good agreement with the experimental results. The correlations mentioned above can facilitate the engineering design.