CO<sub>2</sub> absorption into amine solutions: a novel strategy for intensification based on the addition of ferrofluids

Komati, Srinivas; Suresh, Akkihebbal K.

doi:10.1002/jctb.1871

Cited by 65 publications

(50 citation statements)

References 20 publications

(15 reference statements)

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“…Findings of no effect or decreased mass transfer rates for nanofluids in our study is contrary to other studies that report enhanced diffusion or mass transfer in nanofluids [11][12][13][14]. The reasons for this discrepancy are unclear.…”

Section: Interpretation Of Resultscontrasting

confidence: 99%

Characterizations of Nanofluid Heat Transfer Enhancements

Johnson¹

2013

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Nanoparticle morphology is thought to be an important factor influencing heat and mass transfer rates in liquid systems. How nanoparticles mechanistically increase heat and mass transfer rates is not well understood. Both dispersed nanoparticles and aggregated nanoparticles are thought to play important roles. Dispersed nanoparticles and associated nanoparticle Brownian movements are purported to cause the enhancements by mixing mechanisms whereas aggregated nanoparticles are purported to cause enhancements by forming highly conductive paths. In this study, morphologies of nanoparticle were quantified in laboratory studies and related to laboratory measured heat and mass transfer rates. No mass transfer enhancements were found in the presence of nanoparticles. Thermal conductivity could be predicted with effective medium theory when aggregated nanoparticle aspect ratio was considered. Nanoparticle morphology is thought to be an important factor influencing heat and mass transfer rates in liquid systems. How nanoparticles mechanistically increase heat and mass transfer rates is not well understood. Both dispersed nanoparticles and aggregated nanoparticles are thought to play important roles. Dispersed nanoparticles and associated nanoparticle Brownian movements are purported to cause the enhancements by mixing mechanisms whereas aggregated nanoparticles are purported to cause enhancements by forming highly conductive paths. In this study, morphologies of nanoparticle were quantified in laboratory studies and related to laboratory measured heat and mass transfer rates.Grant research objectives were to answer fundamental questions related to mechanisms of nanofluid heat transfer enhancer enhancements. Activities in part (1) were designed to answer the question of: Are enhancements related to Brownian nanoparticle motion? Activities in part (2) were conducted to answer the question of: Are enhancements related to the extent of particle aggregation and morphology of aggregated particles, and if so, can the extent of particle aggregation and associated heat transfer enhancements be characterized using fractal dimensions of aggregated nanoparticles? Study parts (1) and (2) comprise the majority of the research effort to satisfy objectives associated with rational for funding support. Additional activities in the final year of the grant were completed once these major research objectives had been met. In study part (3), the morphology characterization techniques developed to study heat transfer mechanisms ...

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Section: Interpretation Of Resultscontrasting

confidence: 99%

Characterizations of Nanofluid Heat Transfer Enhancements

Johnson¹

2013

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“…Uncertainty in the ith independent variable [9][10][11][12][13]. In the case of gas absorption process in nanofluids, most of the researchers have shown that nanoparticles can promote mass transfer coefficient [14][15][16][17][18][19][20]. Although a few studies showed that the mass transport rate in nanofluids is decreased, this can be enhanced with increasing the volume fraction of nanoparticles [21,22].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of benzoic acid diffusion coefficient in γ-Al2O3 nanofluids at different temperatures

Fard

Beiki

2015

Heat Mass Transfer

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“…For example, Komati et al [8] have studied the absorption process in CO 2 /MDEA solution by using nanoferrofluid in a wetted-wall column. Their results show an overall enhancement in mass transfer compared to the absence of ferrofluids with a mass transfer coefficient of 92.8% for a 50% volume fraction of the fluid (solid magnetite volume fraction of about 0.39%).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Removal of H2S using MDEA Solution in Microchannel

Ji¹,

Zhang²,

Wei³

et al. 2016

Proceedings of the 2016 5th International Conference on Energy and Environmental Protection (ICEEP 2016)

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Abstract. Hydrogen sulfide is highly toxic and corrosive component of natural gas that must be removed before natural gas is used in industrial applications. Currently, absorption methods using aqueous solutions of methyl diethanolamine are most commonly employed to remove hydrogen sulfide from natural gas feedstocks. A process analysis of H 2 S absorption in a microchannel is explored in this work. The results indicate that the bubbles formed at the gas-liquid interface are not consistent in size. The gas bubbles become significantly smaller in volume within 2 seconds of gas flow. There is a noticeable difference in the rate of change in bubble volume for solutions with 20 vol% and 40 vol% MDEA solution. There is also a 3.8% -5.3% volume change within 0.6 s when 60 vol%, 80 vol%, and 100 vol% solutions of MDEA are used. From these experiments, the overall mass transfer coefficient for H 2 S was calculated and it was found that the overall mass transfer coefficients L ka increases with increasing MDEA content.

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CO₂ absorption into amine solutions: a novel strategy for intensification based on the addition of ferrofluids

Cited by 65 publications

References 20 publications

Characterizations of Nanofluid Heat Transfer Enhancements

Characterizations of Nanofluid Heat Transfer Enhancements

Experimental investigation of benzoic acid diffusion coefficient in γ-Al2O3 nanofluids at different temperatures

Experimental Study on Removal of H2S using MDEA Solution in Microchannel

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CO2 absorption into amine solutions: a novel strategy for intensification based on the addition of ferrofluids

Cited by 65 publications

References 20 publications

Characterizations of Nanofluid Heat Transfer Enhancements

Characterizations of Nanofluid Heat Transfer Enhancements

Experimental investigation of benzoic acid diffusion coefficient in γ-Al2O3 nanofluids at different temperatures

Experimental Study on Removal of H2S using MDEA Solution in Microchannel

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CO₂ absorption into amine solutions: a novel strategy for intensification based on the addition of ferrofluids