CFD modeling of mixing intensification assisted with ultrasound wave in a T-type microreactor

Rahimi, Masoud; Aghel, Babak; Hatamifar, Babak; Akbari, Mohsen; Alsairafi, AmmarAbdulaziz

doi:10.1016/j.cep.2014.10.006

Cited by 46 publications

(18 citation statements)

References 48 publications

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“…The effects of operating variables (molar ratio of methanol to tallow, IRAR temperature, and H 2 SO 4 concentration) were studied in order to establish the optimal conditions for achieving high yields of biodiesel by RSM. Recently, several studies have reported the employment of micro structured reactors with which the reaction performance has been improved . These authors proposed that using such reactors one can achieve high yield of biodiesel with corresponding lower residence time .…”

Section: Introductionmentioning

confidence: 99%

New heterogeneous process for continuous biodiesel production in microreactors

et al. 2017

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This contribution investigates the transesterification of soybean oil with methanol in the presence of demineralized (DM) water plant sedimentation as a heterogeneous catalyst in a microreactor, which has not been studied in previous works. The catalyst systems were characterized by the X-ray diffraction (XRD) method. The effects of catalyst concentration, methanol/oil volume ratio, and residence time on the transesterification efficiency were investigated and the purity of methyl ester was optimized using response surface methodology (RSM). The optimal conditions for the transesterification process were as follows: catalyst concentration of 0.0837 g/g, methanol to oil volume ratio of 1:1.89, and residence time of 10 min during which methyl ester purity was measured at $93.14 %. However, the purity value obtained by experimental model is equal to 87.06 %. Through the analysis of model and experimental data, mean relative error was obtained as 7.17 %. Experimental results indicated that time for the production of methyl ester with high purity (93.14 %) can be shortened significantly in an optimized microreactor compared to conventional stirred reactors (residence time of only 10 min).

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Section: Introductionmentioning

confidence: 99%

New heterogeneous process for continuous biodiesel production in microreactors

et al. 2017

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“…The performance of the bridge design was evaluated by calculating the DOM. The DOM defined by Glasgow et al [5] is used in the following form:…”

Section: Governing Equations and Computational Proceduresmentioning

confidence: 99%

“…Thus, 5 m is small enough for the cell length. For the baseline design without twisting, the DOM was calculated at the section of x=3 mm as 0.12, which is the same value reported by Glasgow et al[5].…”

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confidence: 91%

“…One major difference is the usage of an external energy source other than the energy source that drives the flow. Active techniques use various types of external energy sources, such as electrokinetic [3], magneto-hydrodynamic [4], electroosmic [2], ultrasound wave [5], and pulsed flow sources [6,7]. In contrast, passive techniques use the channel geometry or wall modifications to agitate or generate secondary flow in microchannels.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Channel Wall Twisting on the Mixing in a T-Shaped Micro-Channel

Kang

2019

Preprint

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A new design scheme is proposed for twisting the walls of a microchannel, and its performance is demonstrated numerically. The numerical study was carried out for a T-shaped microchannel with twist angles in the range of 0 to 34π. The Reynolds number range was 0.15 to 6. The T-shaped microchannel consists of two inlet branches and an outlet branch. The mixing performance was analyzed in terms of the degree of mixing and relative mixing cost. All numerical results show that the twisting scheme is an effective way to enhance the mixing in a T-shaped microchannel. The mixing enhancement is realized by the swirling of two fluids in the cross section and is more prominent as the Reynolds number decreases. The twist angle was optimized to maximize the DOM, which increases with the length of the outlet branch. The twist angle was also optimized in terms of the relative mixing. The two optimum twisting angles are generally not coincident. The optimum twist angle shows a dependence on the length of the outlet branch but it is not affected much by the Reynolds number.

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“…One major difference is the usage of an external energy source other than the energy source that drives the flow. Active techniques use various types of external energy sources, such as electrokinetic [4], magneto-hydrodynamic [5], electroosmotic [3], ultrasound wave [6], and pulsed flow sources [7,8]. In contrast, passive techniques use the channel geometry or wall modifications to agitate or generate secondary flow in microchannels.…”

Section: Introductionmentioning

confidence: 99%

Effects of Channel Wall Twisting on the Mixing in a T-Shaped Micro-Channel

Kang

2019

Micromachines

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A new design scheme is proposed for twisting the walls of a microchannel, and its performance is demonstrated numerically. The numerical study was carried out for a T-shaped microchannel with twist angles in the range of 0 to 34π. The Reynolds number range was 0.15 to 6. The T-shaped microchannel consists of two inlet branches and an outlet branch. The mixing performance was analyzed in terms of the degree of mixing and relative mixing cost. All numerical results show that the twisting scheme is an effective way to enhance the mixing in a T-shaped microchannel. The mixing enhancement is realized by the swirling of two fluids in the cross section and is more prominent as the Reynolds number decreases. The twist angle was optimized to maximize the degree of mixing (DOM), which increases with the length of the outlet branch. The twist angle was also optimized in terms of the relative mixing cost (MC). The two optimum twisting angles are generally not coincident. The optimum twist angle shows a dependence on the length of the outlet branch but it is not affected much by the Reynolds number.

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CFD modeling of mixing intensification assisted with ultrasound wave in a T-type microreactor

Cited by 46 publications

References 48 publications

New heterogeneous process for continuous biodiesel production in microreactors

New heterogeneous process for continuous biodiesel production in microreactors

Effects of Channel Wall Twisting on the Mixing in a T-Shaped Micro-Channel

Effects of Channel Wall Twisting on the Mixing in a T-Shaped Micro-Channel

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