Modelling of falling film reactors

Dabir, B; Riazi, M.R.; Davoudirad, H.R.

doi:10.1016/0009-2509(96)00113-3

Cited by 32 publications

(24 citation statements)

References 8 publications

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“…The effects of many factors that influence the flow in falling films have been investigated, such as the effects of thermocapillarity [49], electric fields [50,51], and surfactants [52,53]. Different processes that may be involved in falling films have also been studied, such as heat transfer [54], mass transfer [55], chemical reactions [56], and phase change [57]. Even though the flow of falling liquid films has been widely studied in the literature, it still remains an important research topic and attracts the attention of researchers of various disciplines.…”

Section: Introductionmentioning

confidence: 99%

Impact of droplets on inclined flowing liquid films

2015

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The impact of droplets on an inclined falling liquid film is studied experimentally using highspeed imaging. The falling film is created on a flat substrate with controllable thicknesses and flow rates. Droplets with different sizes and speeds are used to study the impact process under various Ohnesorge and Weber numbers, and film Reynolds numbers. A number of phenomena associated with droplet impact are identified and analysed, such as bouncing, partial coalescence, total coalescence, and splashing. The effects of droplet size, speed, as well the film flow rate are studied culminating in the generation of an impact regime map. The analysis of the lubrication force acted on the droplet via the gas layer shows that a higher flow rate in the liquid film produces a larger lubrication force, slows down the drainage process, and increases the probability of droplet bouncing. Our results demonstrate that the flowing film has a profound effect on the droplet impact process and associated phenomena, which are markedly more complex than those accompanying impact on initially quiescent films.

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Section: Introductionmentioning

confidence: 99%

Impact of droplets on inclined flowing liquid films

2015

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“…Falling film reactors were widely used for gas–liquid absorption and reaction process such as sulfonation, chlorination, ethoxylation, and hydrogenation 1, 2. The main characteristic of this kind of reactor is the motion of a liquid film over a wetted surface under the effect of gravity.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and mass transfer of gas–liquid flow in a falling film microreactor

et al. 2009

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In this article, flow pattern of liquid film and flooding phenomena of a falling film microreactor (FFMR) were investigated using high-speed CCD camera. Three flow regimes were identified as ''corner rivulet flow,'' ''falling film flow with dry patches,'' and ''complete falling film flow'' when liquid flow rate increased gradually. Besides liquid film flow in microchannels, a flooding presented as the flow of liquid along the side wall of gas chamber in FFMR was found at high liquid flow rate. Moreover, the flooding could be initiated at lower flow rate with the reduction of the depth of the gas chamber. CO 2 absorption was then investigated under the complete falling flow regime in FFMR, where the effects of liquid viscosity and surface tension on mass transfer were demonstrated. The experimental results indicate that k L is in the range of 5.83 to 13.4 Â 10 À5 m s À1 and an empirical correlation was proposed to predict k L in FFMR.

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“…As such, these systems find application in extraction, evaporation and highly exothermic processes [1][2][3][4][5][6][7][8]. Conventional falling film systems on tubes or flat surfaces generate films with thicknesses in the order of 0.5-3 mm [9,10]. A microstructured falling film reactor (l-FFR) developed by the Institut fü r Mikrotechnik Mainz can generate stable films less than 100 lm thick.…”

Section: Introductionmentioning

confidence: 99%