Study of Average Static Hold-up Along a Rotary Disc Contactor in the Presence of Nanoparticles
نویسنده
چکیده
Rotary disc contactor (RDC) has been widely used for liquid-liquid extraction owing to its advantages such as high operational flexibility, efficiency, throughput, as well as low driving power and capital cost. As a key variable in liquid-liquid extraction columns, hold-up has been discussed in the literature in three categories: static, dynamic and total hold-up.1 Static hold-up refers to that portion of the dispersed phase which is trapped under the discs,2 while dynamic hold-up refers to the moving fraction of the dispersed phase. Total hold-up equals the sum of static and dynamic hold-ups. There are a number of publications in which dynamic and total hold-ups of RDC have been studied.1–11 However, so far, limited work has been carried out on static hold-up in this type of column; this is despite the fact that many researchers have claimed that this part of the total hold-up could have an important influence on drop coalescence, residence time, interfacial area and general efficiency of the column in mass transfer operations.1,5,6,12,13 In a previous work of the authors,14 using three different chemical systems and a swarm of dispersed phase drops and in the condition of no mass transfer and no continuous phase flow, the average static hold-up in an RDC column was studied and two predictive correlations were proposed. The effects of physical properties, rotor speed, mother drop size, as well as number of stages in the column were considered in the correlations. In case of immovable rotors, this was:
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