Liquid mixing on sieve trays

• Main Author: Al-Saleh, S. A.-A.
• Published: Swansea University 1987
• Subjects: 660
• Online Access: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635717

An investigation has been made based on the measurements of the concentration profiles found from dynamic experiments to study axial and transverse mixing on sieve trays operating under froth, mixed and spray regimes. Two methods of tracer injection were employed, the line and point source tracer injection, and the experiments were carried out over a wide range of gas and liquid flow rates. Air and water were used as system fluids. Two different configurations of columns were used in the dispersion work in order to study the effect of the experimental configuration upon dispersion characteristics. The experimental results were analysed as appropriate for each configuration, the first by a one-dimensional axial plug flow model and the second by a two-dimensional axial and transverse plug flow model. An automatic method of optimization was employed to estimate the values of the longitudinal and transverse dispersion coefficients, and interstitial liquid velocities for each experiment. The variation in the liquid velocities were found to be quite considerable in the mixing studies. In the determination of the clear liquid height a new method was used to calculate the height of clear liquid in terms of the first moment of the dynamic response curve. The data were compared with those measured from manometric method.