01754nas a2200229 4500008004100000022001400041245009400055210006900149260000800218300001100226490000800237520101900245653000801264653001601272653002201288653001701310653001701327653002201344100001801366700002301384856011701407 2018 eng d a0009-250900aPressure equalization approach for flow uniformity in microreactor with parallel channels0 aPressure equalization approach for flow uniformity in microreact cFEB a96-1060 v1763 a

Numbering-up using parallel channels helps to achieve higher processing capacity while retaining the advantages of microreactors. However it may also lead to non-uniformity in flow across all the channels. Here we report the CFD simulations and experimental observations on the extent of uniformity in the flow from an assembly of several parallel channels. In the conventional parallel channel geometry, smaller channel size (<300 m) as well as higher fluid viscosity is seen to give better flow uniformity. Inequality in pressure distribution at the inlet of a large number of parallel channels is overcome by having two `pressure equalization slots' at an equal distance from inlet and outlets that open in the respective manifolds. Having such an arrangement helped to reduce the standard deviation in the flow by almost 90% when compared to the conventional geometry. However the modification was seen to increase the extent of back mixing to some extent. (C) 2017 Elsevier Ltd. All rights reserved.

10aCFD10aExperiments10aFlow distribution10amicroreactor10aNumbering-up10aParallel channels1 aMadane, Ketan1 aKulkarni, Amol, A. uhttps://library.ncl.res.in/content/pressure-equalization-approach-flow-uniformity-microreactor-parallel-channels01751nas a2200241 4500008004100000022001400041245009300055210006900148260000900217300001400226490000800240520095100248653002501199653003001224653000801254653002001262653002601282653001901308100001501327700001801342700002301360856012601383 2019 eng d a1385-894700aAntisolvent based precipitation: batch, capillary flow reactor and impinging jet reactor0 aAntisolvent based precipitation batch capillary flow reactor and cAUG  a1161-11710 v3693 a

A method for continuous antisolvent precipitation of ammonium perchlorate (AP) using a confined impinging jet reactor (CIJR) is studied. The geometry of the CIJR was optimized to achieve excellent mixing with a significant reduction in the particle deposition on walls. Initially, the experimental conditions were optimized in a batch system and then in a continuous capillary reactor. Later those conditions extended for antisolvent precipitation of AP in an impinging jet reactor using water and n-butyl alcohol as a solvent and antisolvent, respectively for optimum performance. The performance was compared with the experiments in batch mode as well as and in a continuous capillary reactor. Over a range of inlet jet velocity that corresponded to 1792 < Re < 7193 for the saturated aqueous solution of AP and 1135 < Re < 4553 for the antisolvent butanol phase, 8.98-16.98 mu m Ammonium perchlorate particles were attained.

10aAmmonium perchlorate10aAntisolvent precipitation10aCFD10acontinuous flow10aImpinging jet reactor10amicroparticles1 aPal, Sayan1 aMadane, Ketan1 aKulkarni, Amol, A. uhttps://library.ncl.res.in/content/antisolvent-based-precipitation-batch-capillary-flow-reactor-and-impinging-jet-reactor01654nas a2200181 4500008004100000022001400041245006900055210006900124260000800193300001200201490000700213520108400220100001501304700001801319700001601337700002301353856009601376 2021 eng d a0888-588500aImpingement dynamics of jets in a confined impinging jet reactor0 aImpingement dynamics of jets in a confined impinging jet reactor cJAN a969-9790 v603 a

The interaction of two impinging liquid jets in a confined impinging jet reactor (CUR) is explored. Multiphase flow simulations were performed using the volume of fluids (VOF) approach to investigate the impingement dynamics of liquid impinging jets, and single-phase CFD simulations have been performed to understand the turbulence and the mixing performance in the system. At identical inlet velocities, the liquid sheet formed on the impingement axis was found to move toward the liquid jet inlet of the lesser density fluid until reaching equilibrium. The formation and transient movement of liquid sheets are characterized for different jet velocities. An improved reactor geometry is proposed that reduces the wall effect on sheet formation and wall deposition on discharge points of jets. Upon breaking away from the impinging film, the two liquid phases are found to be intertwined in the form of ligaments and droplets after fragmentation of the sheet, providing a higher interfacial confirmed by performing high-throughput continuous antisolvent precipitation.

1 aPal, Sayan1 aMadane, Ketan1 aMane, Mayur1 aKulkarni, Amol, A. uhttps://library.ncl.res.in/content/impingement-dynamics-jets-confined-impinging-jet-reactor