Heat-Transfer Performance of a Liquid−Liquid Microdispersed System

Wang, Kai; Lü, Yangcheng; Shao, Huawei; Luo, Guangsheng

doi:10.1021/ie8005484

Cited by 31 publications

(17 citation statements)

References 24 publications

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“…During recent years, microdispersed liquid/liquid and gas/liquid systems have caught the attention of many researchers for their controllable flow and effective transport properties. It has been found that the heat and mass transfer rates can be significantly increased with the reduction of dispersed size 1–3. By using microfluidic devices, micromonodispersed bubbles and droplets can be prepared, which are more useful for research and production processes.…”

Section: Introductionmentioning

confidence: 99%

Generation of micromonodispersed droplets and bubbles in the capillary embedded T‐junction microfluidic devices

Wang

Lü

et al. 2011

AIChE Journal

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This work focuses on the dispersion of micromonodispersed droplets and bubbles in the capillary embedded T-junction microfluidic devices. The effects of the microchannel structure, operating conditions, and physical properties on the dispersion rules were carefully investigated. It was found that the extended capillary could greatly affect the dispersion rules, which was favorable for reducing the dispersed size. The dispersed size was mainly dominated by the Ca number, and the effects of dispersed phase flow rate and viscosity ratio of the two phases were also very important. The dispersion mechanism and size rules in the capillary embedded microfluidic devices were discussed seriously by comparing the similarities and differences of the liquid/ liquid and gas/liquid dispersion processes. V V C 2010 American Institute of Chemical Engineers AIChE J, 57: [299][300][301][302][303][304][305][306] 2011

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Section: Introductionmentioning

confidence: 99%

Generation of micromonodispersed droplets and bubbles in the capillary embedded T‐junction microfluidic devices

Wang

Lü

et al. 2011

AIChE Journal

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“…Regardless of the coalescence of microdroplets in the observed process, the size of microdroplets in the liquid−liquid microdispersion system ranged from 30 to 50 μm while changing the continuous flow rate. According to the research of Wang et al 36 in the liquid−liquid microdispersion system, the mass transfer coefficient of the liquid−liquid microdispersion system could be calculated with a value of 0.73 m/s, so it is feasible to provide a low concentration distribution for the Ti species and lead to a co-condensation with oligomeric silicate solution in this novel system for high-quality TS-1 particles.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Liquid–Liquid Microdispersion Method for the Synthesis of TS-1 Free of Extra-Framework Ti Species

Wang

Han

et al. 2019

Ind. Eng. Chem. Res.

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A novel liquid–liquid microdispersion method for the synthesis of TS-1 has been developed by continuous preparation of the precursor. In the novel process, the solution of TBOT in n-hexane could be very uniformly dispersed into the oligomeric silicate prehydrolysis mixture to form microdroplets by a microsieve pore reactor. Due to the fast mixing and very high mass transfer performance of the microdispersion process, the Ti species could be uniformly distributed into the mixture and were more likely to condense into the oligomeric silicate precursor species rather than appear with self-condensation. The prepared samples had a minimum molar ratio of Si/Ti at 51 without extra-framework Ti species. Furthermore, the solvent of n-hexane can be recycled by simple phase separation rather than evaporation under the conditions of using isopropanol, which reduced energy consumption. This continuous microdispersion technology could be controllable and a reliable scaling-up for the preparation of TS-1.

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“…A phenomenological model for heat transfer was validated with experimental data (Lemenand et al, 2010) and longitudinal embedded vorticity was identified as the main intensification factor for heat transfer. Finally, using a microdispersion contactor, Wang et al (2008) studied heat transfer microdispersing hot octane and hexane into cold water, by cross flow of the oil phase into water through a membrane. Significant enhancement in heat transfer was observed due to dispersion with up to a 15-20 increase in the volumetric heat transfer coefficients compared to a conventional dispersed system.…”

Section: Heat Transfer To Liquid-liquid Mixturesmentioning

confidence: 99%

Heat transfer to immiscible liquid mixtures in a spiral plate heat exchanger

Sathiyan

Rangarajan

Ramachandran³

2013

Braz. J. Chem. Eng.

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-This work presents new predictive correlations for heat transfer to immiscible liquid-liquid mixtures in a spiral plate heat exchanger. Liquid-liquid heat transfer studies were carried out in spiral plate heat exchangers for the water-octane, water-kerosene, and water-dodecane systems. For each composition of the mixture, the mass flow rate of the cold fluid was varied, keeping that of the hot fluid and the fluid inlet temperatures constant. Two-phase cold flow rates were in the laminar range, while the hot fluid flow was turbulent. Calculations of the LMTD (log mean temperature difference) correction factor showed that the flow was countercurrent. Heat transfer coefficients of the two-phase liquids were found to be strongly dependent on the composition of the liquid mixture and exhibited abrupt transitions as a function of the compositions. Given the absence of predictive correlations in the literature that sufficiently capture this compositiondependence, new empirical correlations were developed using part of the experimental data, with the composition of the cold fluid as an explicit variable. Statistical analysis of the regression yielded satisfactory results. The correlations were tested against the rest of the experimental data and were found to predict heat transfer coefficients within ± 15%. These preliminary studies should be useful in designing compact exchangers for handling two-phase water-organics mixtures.

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Heat-Transfer Performance of a Liquid−Liquid Microdispersed System

Cited by 31 publications

References 24 publications

Generation of micromonodispersed droplets and bubbles in the capillary embedded T‐junction microfluidic devices

Generation of micromonodispersed droplets and bubbles in the capillary embedded T‐junction microfluidic devices

Liquid–Liquid Microdispersion Method for the Synthesis of TS-1 Free of Extra-Framework Ti Species

Heat transfer to immiscible liquid mixtures in a spiral plate heat exchanger

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