Outstanding Paper Award Subcommittee of Kagaku Kogaku Ronbunshu has assessed the 65 papers published in volume 41 in 2015, and the editorial board finally selected the three papers for Kagaku Kogaku Ronbunshu Paper Awards of 2015; those are the papers on “New Pattern Dynamics of Fluid Mixing,” “Drying Characteristics of Wet Brown Coal Particles in a Steam Fluidized Bed,” and “Effect of Rapid Heating on Microwave-Assisted Synthesis of SAPO-34 Membranes.”
The Eulerian velocity vector defined by the expansion rate at the top element of a streakline is able to represent the template and the motion of the potential mixing pattern which is intrinsic to the flow field and independent to the initial pattern. When this new velocity vector is used, its streamline represents the dynamical pattern concerning to the velocity and the direction of the lamella in the potential mixing pattern. On the other hand, its streakline represents the static geometric pattern of the lamella.
Few papers have reported the power consumption and mass transfer volumetric coefficient measured in mixing vessels equipped with wide-paddle impellers under aeration. In this paper, the power consumption and mass transfer volumetric coefficient were measured in mixing vessels equipped with various wide-paddle impellers under aeration. It was found that the large paddle impeller did not decrease the aerated power consumption, because no large cavity was generated. The mass transfer volumetric coefficients were correlated with the equation of Sato et al. (1989) in an air–water system, and those in an air–CMC solution system were correlated with the equation of Hiraoka et al. (2003) under turbulent conditions.
Real-time monitoring of the moisture content of crystal powder in a fluidized bed dryer was investigated during the conversion of lactulose trihydrate crystal powder into lactulose anhydride crystal powder. In-line near-infrared spectroscopy (NIRS) was used to measure NIR spectra of the fluidized bed drying of lactulose trihydrate crystal powder to produce lactulose anhydride crystal powder. A PLS regression model was built based on the reference moisture values after pretreatment by the MSC method. Dependencies of the spectra on dry air temperature and particle size were eliminated in the regression model. This model was externally validated by using another lot of lactulose trihydrate crystal powder in the process of fluidized bed conversion of lactulose trihydrate crystal powder into lactulose anhydride crystal powder. The predicted moisture values agreed well with the reference moisture values. The result shows that the moisture content can be estimated well by this method despite the dependencies of the NIR spectra on temperature and particle size. This confirms the feasibility of using in-line NIRS for real-time monitoring of moisture content of crystal powder in a fluidized bed dryer during the conversion of lactulose trihydrate crystal powder into lactulose anhydride crystal powder.