Agitation of yield stress fluids in different vessel shapes

Ameur, Houari

doi:10.1016/j.jestch.2015.06.007

Cited by 23 publications

(10 citation statements)

References 23 publications

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“…Tangki Penyimpanan (Storage Tank) CPO radial. Putaran secara radial, dapat mempercepat perpindahan panas yang merata (Ameur, 2016), dan konsep pengadukan dipilih sebagai dasar mekanisme penyebaran panas di storage tank.…”

Section: Pendahuluanunclassified

Pengamatan Kualitas Cpo Pada Storage Tank Dengan Penambahan Sistem Pengadukan Pada Berbagai Variasi Temperatur

Renjani

Sugiarto

Dharmawati

2020

JTEP-L

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Penurunan mutu Crude Palm Oil (CPO) dapat terjadi selama penyimpanan di storage tank dan ketika proses pengiriman, oleh adanya reaksi oksidasi dan reaksi hidrolisis sehingga menurunkan suhu CPO selama penyimpanan. Suhu dipenyimpanan CPO yang tidak terkontrol dengan baik, sering kali menjadi penyebab terjadinya penurunan mutu CPO di dalam storage tank. Penelitian ini bertujuan untuk menganalisis kualitas CPO produksi selama penyimpanan pada berbagai variasi suhu dan pengadukan. Parameter yang diamati dan dianalisis dari proses penyimpanan CPO di storage tank terdiri dari: waktu penyimpanan, variasi suhu, dan penambahan sistem pengaduk atau agitator. Pengambilan sampel dilakukan sebanyak dua kali sehari, sedangkan parameter yang diamati yaitu Asam Lemak Bebas (ALB), kadar kotoran, dan kadar air. Hasil dari penelitian ini menunjukkan bahwa penggunaan sistem pengadukan dapat memperlambat kenaikan ALB dibandingkan dengan sistem penyimpanan konvensional. Kenaikan kandungan ALB CPO pada penyimpanan konvensional sebesar 0,13% per hari, sedangkan ALB sistem penyimpanan dengan pengadukan hanya menaikkan ALB CPO sebesar 0,05% per hari. Berdasarkan penelitian ini temperatur yang optimum untuk mempertahankan kualitas CPO adalah 50 oC. Kata Kunci: agitator, asam lemak bebas, crude palm oil, storage tank, temperatur

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Section: Pendahuluanunclassified

Pengamatan Kualitas Cpo Pada Storage Tank Dengan Penambahan Sistem Pengadukan Pada Berbagai Variasi Temperatur

Renjani

Sugiarto

Dharmawati

2020

JTEP-L

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“…Other category of researchers used a cylindrical vessel of curved bottom inside of flat bottom and it was found a significant impact on impeller performance (Ameur et al 2018b andKang et al 2019). Ameur (2016) numerically studied a Bingham fluid in mechanical agitator of Scaba 6SRGT impeller and different form of the stirred vessel (cylindrical with fat bottom, cylindrical with curved bottom and completely spherical). The results showed that the spherical configuration generated a uniform rotational flow with less consumption energy.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Analyses of the Flow Patterns in Stirred Vessel of Two-Bladed Impeller

Laidoudi¹

2020

JSSCM

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In this paper, the governing equations of continuity and momentum subjected to suitable boundary conditions have been solved numerically to investigate the fluid flow in stirred vessel of two-bladed impeller. The numerical simulations have been carried out in three-dimensions for laminar flow. The studied fluid was considered Newtonian and incompressible. Our research studied the effects of geometrical configurations of the two-bladed impeller and its rotational speed on fluid patterns and mechanical power consumption. The innovative point in this paper is that the blades of the impeller contain three equal-sized holes of circular cross-section. The diameter of the hole (d) to the impeller diameter (D) gives the ratio d/D. the impeller speed is controlled by the Reynolds number (Re). The obtained results have been illustrated and discussed for the range of following governing parameters: d/D = 0 to 0.4 and Re = 1 to 300. The results showed that the studied parameters have significant effects on fluid flow and consumption power and the perforated blades of ratio d/D = 0.133 is more efficient than plan blades. Also, a new correlation is proposed to describe the consumption power as function of d/D and Re.

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“…Sajjadi et al (2016) [19] studied the effect of jet mixing of non-Newtonian fluids in order to reduce dead zones, concluding that the outlet and inlet points, and the specific power input affect the volume of the stagnant zones and the percentage of active materials that remain inside the digester. Through CFD investigations, Ameur (2016) [20] has shown that among different vessel shapes, spherical ones provide uniform flow in the entire vessel and lead to lowest energy consumption. Zhang et al (2016) [21] did a comparison between the power number obtained from experimental data and the results of different turbulence models for the digestion of cattle manure and corn stover, considering the fluid as incompressible and pseudoplastic.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Biogas Reactor Fluid Rheology—Implications for Mixing Profile and Power Demand

et al. 2019

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Anaerobic digestion (AD) is an established process for integrating waste management with renewable energy and nutrient recovery. Much of the research in this field focuses on the utilisation of new substrates, yet their effects on operational aspects such as fluid behaviour and power requirement for mixing are commonly overlooked, despite their importance for process optimisation. This study analysed rheological characteristics of samples from 21 laboratory-scale continuous stirred-tank biogas reactors (CSTBRs) digesting a range of substrates, in order to evaluate substrate effect on mixing efficiency and power demand through computational fluid dynamics (CFD). The results show that substrate and process parameters, such as solids content and organic loading, all have a significant effect on CSTBR fluid rheology. The correlation levels between rheological and process parameters were different across substrates, while no specific fluid behaviour patterns could be associated with substrate choice. Substrate should thus be considered an equally important rheology effector as process parameters. Additional substrate-related parameters should be identified to explain the differences in correlations between rheological and process parameters across substrate groups. The CFD modelling revealed that the rheology differences among the AD processes have significant implications for mixing efficiency and power demand of the CSTBRs, highlighting the importance of considering the substrate-induced effects on CSTBR rheology before including a new substrate.

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Agitation of yield stress fluids in different vessel shapes

Cited by 23 publications

References 23 publications

Pengamatan Kualitas Cpo Pada Storage Tank Dengan Penambahan Sistem Pengadukan Pada Berbagai Variasi Temperatur

Pengamatan Kualitas Cpo Pada Storage Tank Dengan Penambahan Sistem Pengadukan Pada Berbagai Variasi Temperatur

Hydrodynamic Analyses of the Flow Patterns in Stirred Vessel of Two-Bladed Impeller

A Comparative Study of Biogas Reactor Fluid Rheology—Implications for Mixing Profile and Power Demand

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