Spinning cone distillation column (SCC) is a gas-liquid contacting instrument whose function is in the food processing industries. This technology serves as a complementary approach to conventional packed and plate column distillation, particularly in applications requiring high tolerance to solid contaminants and minimal thermal impact on processed materials. In this research, CFD simulations were conducted using pressure and velocity distributions in a pilot-scale SCC, both in the presence of gas and in the absence of liquid flow (dry column) and in the presence of both gas and liquid (two-phase column). The innovation of this research is the results of the new geometry in the simulation. At the present work, the modeling of four fixed cones and three spinning cones, which is between them, has been performed and the suction effect of the spinning cones at the top and bottom of the tower is also taken into account. This geometry led to more accurate results than the experimental results. An increase in gas flow rate may result in higher pressure drops in both dry and two-phase conditions. By calculating logarithm, the line slope of CFD and experimental data will obtain which is equal to 1.835 and 1.847 respectively. These amounts match with the curve slope of pressure drop regarding passed gas flow velocity from orifice (1.8-2).  The simulation results can be used to predict industrial applications of the SCC.

In a previous paper, pressure drop, flooding and mass-transfer characteristics of a novel pilot-scale distillation column called spinning cone column (SCC) were presented. Here, we present the result of comparison of mass-transfer efficiencies of SCC and structured packing. Comparison of SCC and structured packing mass-transfer characteristics show that the gas and liquid-side height of transfer units (HTUs) of the SCC are on the average 20% and 50% lower than the corresponding values for structured packing respectively. This in turn results in lower HETPs of the SCC for practical applications. Predicted HETPs in ethanol distillation using SCC are 30% lower than those of structured packing. Predicted HETPs for fusel oil and orange oil distillations are also 45% and 35% lower respectively than the experimental values obtained for structured packing. From these results, it is concluded that SCCs are more efficient with respect to mass-transfer than this particular structured packing, but to draw a general conclusion, more specific data on pressure drop per NTS, and liquid hold-up and residence time of the two columns should be available.

A 10-year-old girl was referred for a voiding cystourethrogram (VCUG) with a history of recurrent urinary tract infections. Examination including neurological evaluation was unremarkable. Ultrasonography of the kidneys and bladder was normal. Voiding phase of VCUG was subsequently performed. Bladder capacity and outline were normal (Figure 1). There was marked dilatation of posterior urethra (Figure 2) with smooth tapering towards distal end resembling a “ spinning top” . . . .