DYE RECOVERY BY LOW PRESSURE ULTRAFILTRATION†

Ultrafiltration or textile dyes using polyacrylonitrile hollow fibers is reported. Experiments were carried out in recirculating system with various flow intensities along the fiber. Dependence of rejection and membrane flux on concentration of bulk solution is presented. Due to aggregation of dye particles and good separation characteristics of membranes used high water recovery and concentration of dyes were obtained.     

Study on the periodic flows in a rectangular container under a background rotation

We present numerical and experimental results of the periodic flows inside a rectangular container under a background rotation. In numerical computation, a parallel-computation technique with MPI is implemented. Flow visualization and PIV measurement are also performed to obtain velocity fields at the free surface. Through a series of numerical and experimental works, we aim to clarify the fundamental reasons of discrepancy between the two-dimensional computation and the experimental measurement, which was detected in the previous study for the same flow model. Specifically, we check if the various assumptions prerequisite for the validity of the classical Ekman pumping law are satisfied for periodic flows under a background rotation.