01806nas a2200229   4500008004100000022001400041245008200055210006900137260006700206300001400273490000700287520101300294653001401307653001801321653002901339653001301368653001401381100002701395700001701422700002301439856011401462       2014                        eng d  a0008-403400aTwo-phase flow in metal monoliths: hydrodynamics and liquid-liquid extraction0 aTwophase flow in metal monoliths hydrodynamics and liquidliquid   a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcDEC  a2166-21750 v923 a<p>This work aims to explore the application of metal monoliths as a scale-up option for efficient liquid-liquid extraction. The pressure drop, mass transfer and residence time distribution are measured for low Ca (approximate to 10(-5)) with monoliths having three different cell densities. The cross-over section between two monoliths was seen to enhance mixing in the column. However, the RTD of two-phase liquid-liquid up-flow was inferior to the single phase RTD. For higher cell density substrates, the cross-over zones seem to cause trapping of slugs due to non-superimposing channel ends. Relatively high shear rates through the film of continuous phase helped enhance the mass transfer rates, thereby helping to achieve the desired extraction in a short column. The entrance sections and cross-over zones between the monoliths adversely affected the extraction for higher cell density monoliths. The analysis of data supports use of low cell density monolith for better performance and scale up.</p>10acapillary10ahydrodynamics10aliquid-liquid extraction10amonolith10aslug flow1 aDeshpande, Jaydeep, B.1 aGosavi, Abha1 aKulkarni, Amol, A.  uhttp://library.ncl.res.in/content/two-phase-flow-metal-monoliths-hydrodynamics-and-liquid-liquid-extraction-002120nas a2200229   4500008004100000022001400041245006700055210006700122260010600189300001200295490000800307520132300315653001801638653001601656653003001672653002001702653001801722653001401740100001501754700002301769856009801792       2016                        eng d  a0009-250900aInterfacial precipitation and clogging in straight capillaries0 aInterfacial precipitation and clogging in straight capillaries  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcOCT  a344-3530 v1533 a<p>Clogging of straight capillaries during interfacial precipitation (of common salt from saturated salt solution and acetone) was studied for a range of conditions that result in different flow regimes. The particle formation and clogging was explored using the images obtained by tracking a moving slug in real time. The flow regimes varied along the capillary length due to continuous mass transfer of acetone to water resulting in elongation of continuous phase slugs. In the slug flow regime, the precipitated particles formed solid shells/hemi spherical caps at the rear of acetone slugs, which eventually get detached from the interface. In the wavy parallel flow regime, where the interface is not flat, salting out was almost instantaneous and it led to faster clogging of the channels. Smaller Ca, i.e. lower flow rates or the use of smaller capillary length or using continuous fluid of relatively higher viscosity or lower interfacial tension can help to avoid or delay clogging. Formation of cohesive shells at the rear of a slug delayed clogging in the capillaries by delaying settling of individual particles. Parallel flow regime with a flat interface delayed the clogging significantly due to poor mass transfer as well as higher superficial velocities. (C) 2016 Elsevier Ltd. All rights reserved.</p>10aClogging time10aFlow regime10aInterfacial precipitation10aMicro-capillary10aPorous shells10aslug flow1 aPal, Sayan1 aKulkarni, Amol, A.  uhttp://library.ncl.res.in/content/interfacial-precipitation-and-clogging-straight-capillaries