Energy changes during use of high-power ultrasound on food grade surfaces

Mamvura, Tirivaviri A.; Iyuke, Sunny E.; Paterson, Anthony H.J.

doi:10.1016/j.sajce.2017.12.001

Cited by 49 publications

(36 citation statements)

References 32 publications

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“…The increase of the the P N caused a significant linear increase in the heating rate, and consequently in the I (p value <0.05). This linear dependence was previously reported for different systems and for different solvents , distilled water (Mamvura et al, 2018), municipal wastewater with suspended particles (Gibson et al, 2009) or peanut shell suspensions . Increasing the nominal applied energy enhanced the heating rate in the suspensions.…”

Section: Acoustic Characterizationsupporting

confidence: 84%

“…decreased in a constant way from 1.5 cm up to 5.5 cm away from the sonotrode because the maximum acoustic intensity decreased exponentially when too little distances close to the tip are taken Mamvura et al (2018). and Son et al(2009) alsoreported similar linear trend when applying electrical power above 100 W in distilled water over higher distances.…”

mentioning

confidence: 84%

“…Possible reasons for this attenuation are related to the reflection, refraction, diffraction or scattering of the wave when travelling across the suspensions. Moreover viscous interactions of the particles can also contribute to the degradation of the acoustic energy into heat (Mamvura et al, 2018;. The acoustic intensity, I, can be related to the distance from the tip, d, by an exponential relation (Equation 5.4.5).…”

Section: Influence Of Solids Concentration (X S ) Of Suspensions On Amentioning

confidence: 99%

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Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

Polachini¹

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ACKNOWLEDGMENTSThis study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Finance Code 001. This study was also financed by CAPES to develop part of this PhD thesis in Spain under the grant number 88881.132626/2016-01. Thanks to the São Paulo Research Foundation (FAPESP) (Grant number 2017/06518-2) for their financial support to develop this project.At first, I would like to thank the Universitat Politècnica de València (UPV) and ASPA de amido) e no comportamento reológico (maior viscosidade) das suspensões prétratadas na presença de ultrassom. O campo acústico produzido nas suspensões sofreu uma redução durante a hidrólise, possivelmente devido às referidas alterações. Assim, pode-se concluir que o ultrassom de alta intensidade é uma tecnologia interessante para intensificar os pré-tratamentos de resíduos da agroindústria para a produção de bioetanol.Palavras-chave: Biomassa. Propriedades físicas. Campos acústicos. Hidrólise.Cinética. ABSTRACTThe pre-treatment of agroindustrial wastes is one of the most complex steps of their conversion process into bioethanol. This step consists basically of applying physical or chemical treatments in biomass in order to obtain carbohydrates partially hydrolyzed and more accessible for future action of enzymes and microorganisms. In this sense, the use of high-intensity ultrasound has been shown as a technology with an interesting potential, in combination with conventional methods, to enhance the mass and energy transfer processes. In the present study, it was characterized agroindustrial residues such as cassava bagasse, peanut shells and artichoke residues as potential materials for the production of bioethanol after acid pretreatment with and without the application of ultrasound. Thus, the different biomass/acid solutions systems were characterized according to their thermophysical properties (density, specific heat, thermal diffusivity and thermal conductivity) and rheological behavior. The acoustic fields generated in these different systems during ultrasound application were also characterized by a calorimetric method. Then, the ultrasonic intensity obtained in each case was related to the termophysical and reological properties. Subsequently, the kinetics of reducing and total sugar release and the structural changes produced in the suspensions considered during the pretreatments in acid solutions with conventional agitation or assisted by ultrasound were determined. The results obtained indicated that suspensions with higher acid concentration and higher solids content showed lower heat transfer capacity, given by the higher values for specific heat, thermal diffusivity, thermal conductivity. The same suspensions presented higher values of density and viscosity, which leads to greater resistance to flow. This fact was attributed, not only to the high viscosity, but also to the appearance of non-Newtonian rheological behavior as showed by the fitting of Herschel-Bulkley model. In these cases, the suspensions cont...

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Section: Acoustic Characterizationsupporting

confidence: 84%

mentioning

confidence: 84%

Section: Influence Of Solids Concentration (X S ) Of Suspensions On Amentioning

confidence: 99%

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Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

Polachini¹

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“…This occurs due to energy loss in the equipment by dissipation during the subsequent conversions of mechanical energy into cavitation. According to Mamvura, Iyuke and Paterson [57], an energy conversion from electrical to cavitation of 9% was achieved. Shirsath, Sable, Gaikwad, Sonawane, Saini and Gogate [36] also verified through a calorimetric method that the energy efficiency of the process was approximately 5.6%.…”

Section: Specific Energymentioning

confidence: 99%

Specific Energy: A New Approach to Ultrasound-assisted Extraction of Natural Colorants

Strieder¹,

Silva²,

Meireles³

2019

fph

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The demand for natural colorants has boosted the search for innovative technologies to obtain them. Ultrasound-assisted extraction (UAE) is one of the new green techniques that has been studied due to its process advantages that include high yields, short extraction times and nonutilization of elevated temperatures. However, a nonstandardization of the UAE variables complicates comparisons and hinders progress in the studies of this topic. In this review, the focus is the verification and discussion of which UAE process conditions authors have used to obtain natural colorants. Thus, it is possible to confirm that some authors used ultrasonic systems that are not appropriate for performing a good extraction, that some used a great amount of solvent and a long extraction time, and that researchers did not express the main variables (nominal power, extraction time and sample mass) as a function of the specific energy applied to processing. Therefore, it is possible to conclude that some studies using UAE were not conducted to obtain the best results, and the expression of the variables as a function of specific energy can generate a standardization, which facilitates comparison among the results obtained by the scientific community.

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Section: Influence Of Nominal Electrical Power Applied (P N ) On Acoumentioning

confidence: 99%

Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

Polachini¹

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Energy changes during use of high-power ultrasound on food grade surfaces

Cited by 49 publications

References 32 publications

Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

Specific Energy: A New Approach to Ultrasound-assisted Extraction of Natural Colorants

Evaluation of the acid pretreatment of agroindustrial waste assisted by high-intensity ultrasound for further bioethanol production

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