Investigating Drag Reduction Characteristic using Okra Mucilage as New Drag Reduction Agent

Bari, Hayder A. Abdul; Kamaruliza, Siti Nuraffini; Man, Rohaida Che

doi:10.3923/jas.2011.2554.2561

Cited by 9 publications

(9 citation statements)

References 7 publications

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“…The Reynolds number, Re, and the friction factor, f , are defined by Eqs. (2) and (3), respectively,…”

Section: Rotating Apparatusmentioning

confidence: 99%

“…Especially for studies of natural polymer drag reducers extracted from aloe vera plants, many authors also reported the increase in DR with the increase of concentration [32,2,31]. From the results presented in Fig.…”

mentioning

confidence: 95%

“…Concerning industrial applications of aloe vera, we can cite the work of [2] Among these, the occurrence of acemannan is of particular interest, since it is the major polysaccharide present in aloe vera gel and it is considered to play a significant role in the biological activity of this material, as reported by [35]. Naturally, the dimensions of the leaves increase with time.…”

mentioning

confidence: 99%

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The Role Played by the Aging of Aloe Vera on Its Drag Reduction Properties in Turbulent Flows

Soares¹,

Siqueira²,

Leal³

et al. 2018

Preprint

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Polymeric drag reducers have been developed over many years due to the great number of practical applications. In all of them, the molecular stability is an essential requirement. Usually, polymers break down under turbulent flows, which causes a decrease in their efficiency as drag reducers. Besides that, some specific applications, in agro and biomedical fields, impose a specific requirement that must be fulfilled, which is the use of non-toxic materials. A suitable stable material that is elected to accomplish this necessity is the mucilage of aloe vera, which is a bio-polymer that can be used as an alternative to the synthetic ones. Here, we investigate the role played by the aging of aloe vera on its capacity to reduce drag. The results obtained by 1H nuclear magnetic resonance indicate that the compositions of young and mature leaves of aloe vera are different and such a difference plays an important role on their efficiency as drag reducers. Tests were performed to analyse the drag reduction in a rotating apparatus and in a pipeline system and the efficiencies of leaves of different ages were compared to their composition. The main conclusion of these experiments is that the young mucilage samples, which are richer in complex polysaccharides and exhibit lower acid contents, are more efficient drag reducers.

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“…The Reynolds number, Re, and the friction factor, f , are defined by Eqs. (2) and (3), respectively,…”

Section: Rotating Apparatusmentioning

confidence: 99%

mentioning

confidence: 95%

mentioning

confidence: 99%

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The Role Played by the Aging of Aloe Vera on Its Drag Reduction Properties in Turbulent Flows

Soares¹,

Siqueira²,

Leal³

et al. 2018

Preprint

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“…Tiederman [8] and Virk [9] further reported from their experimental investigations that drag reduction (DR) is restricted at a certain asymptote value.…”

Section: Introductionmentioning

confidence: 99%

New Complex for Enhancing Drag Reduction Efficiency

Hawege¹,

Bari²

2015

IJCEA

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Abstract-Polymers have long been recognized as an effective drag reduction agent for strategic pipeline system. Unfortunately, such efficiency ends when the polymer molecule degrades in the pipeline especially when it flows through the pump. The aim of this work is to enhance the polymer's efficiency through addition of a surfactant. In particular, the present work investigated the drag reduction performance as well as degradation characteristics of anionic polymer polyacrylic acid (PAA) in the presence of a non-ionic surfactant (Tween 20). Rotating disk apparatus (RDA) and closed-loop liquid circulation (pipeline) techniques were employed in the study, and various surfactant effects, PAA concentrations and rotating speeds were tested. The results showed that the PAA drag reduction efficiency increased in the presence of Tween 20. Almost 37% drag reduction (%DR) was observed at 1200 rpm. Additionally, the influence of surfactant on enhancing the drag reduction performance of PAA was evident when the investigation was carried out in the closed-loop liquid circulation system.

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“…Lumley [7] concluded that the stretching of randomly coiled polymers due to robust turbulent flow is pertinent for DR. Difference in turbulent construction in the buffer layer was also investigated by Tiederman [8]. Virk [9] based on experimental results suggested that DR is incomplete by an asymptotic value.…”

Section: Introductionmentioning

confidence: 99%

Studying the Interaction between a New Mixture in Enhancing Drag Reduction Efficiency

Bari¹,

Faraj²

2015

IJCEA

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Abstract-Polymers are used as drag reducer in a strategic pipeline successfully for the past few decades due to its viscoelastic properties that can suppress the turbulent in pipelines. One of the many issues facing the use of these additives is its resistance to high shear forces during the transportation where it can be easily degraded where they pass them a pump. In the present work, polymer-surfactant complexes of anionic polymer and nonionic surfactant are investigated to prove its capability in enhancing the drag reduction and mechanism degradation performance. The interaction between anionic polymer Poly (acrylamide-codiallyl-dimethylammonium chloride) and nonionic surfactant tween 20 in aqueous solution has been studied by using rheology, rotating disk apparatus (RDA) and pipe loop techniques. The effect of polymer concentration, surfactant concentration and rotational speed in enhancing the drag reduction were studied. The results showed that almost 35% drag reduction can be obtained. In addition, the effect of the degradation on the mixtures as a function in the time has been discussed also. Index Terms-Polymer, surfactant, drag reduction, RDA.

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Investigating Drag Reduction Characteristic using Okra Mucilage as New Drag Reduction Agent

Cited by 9 publications

References 7 publications

The Role Played by the Aging of Aloe Vera on Its Drag Reduction Properties in Turbulent Flows

The Role Played by the Aging of Aloe Vera on Its Drag Reduction Properties in Turbulent Flows

New Complex for Enhancing Drag Reduction Efficiency

Studying the Interaction between a New Mixture in Enhancing Drag Reduction Efficiency

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