Drag-reduction effectiveness of xanthan gum in a rotating disk apparatus

Sohn, Jeong‐In; Kim, C.A.; Choi, Hyoung Jin; Jhon, Myung S.

doi:10.1016/s0144-8617(00)00232-0

Cited by 74 publications

(44 citation statements)

References 37 publications

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“…Also, studies in their dilute and entangled form has as well been reported by (Wyatt et al 2011), on the effects of salt addition which affects their conformation by (Wyatt and Liberatore, 2009). Drag reduction increased with Xanthan concentration and It has as well been reported that, the required concentration for maximum drag reduction decreases as molecular weight increased (Sohn et al 2001), thus, molecular structure is an important criteria considered here (Kim et al 1998) as well as Drag reduction is influenced by chain flexibility (Bewersdorff and Berman, 1988). From all these, it is evident that XG has ability to reduce drag, nevertheless to confirm this, result of the drag reduction test carried out on XG and represented by Figure 3 which shows and supports the above studies, nevertheless, this is not the main purpose of this study, thus, further investigations are needed to be carried out when these materials are combined with other materials to fulfill the purpose of carrying out these investigations.…”

Section: Fig 4 Influence Of Concentration On Torque With Respect Tomentioning

confidence: 70%

“…When the drag reduction efficiency of Rigid polymers, especially xanthan gum was investigated, it has been observed that, they are as well able to reduce drag with reported maximum drag reduction of about 33% (Sohn et al 2001;Kim et al 1998;Den Toonder et al 1997;Bewersdorff and Berman, 1988;Escudier et al 1999;Brostow et al1990;Ching et al 2006). The most important postulations on these studies are, drag reduction increases when Xanthan gum concentration increased.…”

Section: Fig 4 Influence Of Concentration On Torque With Respect Tomentioning

confidence: 97%

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Investigating the Drag Reduction Performance of Rigid Polymer–Carbon Nanotubes Complexes

Oluwasoga¹,

Abdulbari²

2016

JAFM

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Transporting liquids in commercial Pipeline is very expensive due to cost incurred in the installation of pumping stations. This cost can be reduced by polymeric additives. However, these polymeric additives degrade over time as a result of mechanical stress the fluids are subjected to. Previous efforts to address these problems have not been successful. It is thus inevitable to find alternative means of reducing the frictional drag in fluid flow. In this present work, the experimental study of rigid polymer, Carbon Nanotubes (CNT) Nanofluids and the complex mixtures for drag reduction in a rotating disk apparatus. The finding shows that, about 50% drag reduction was achieved; a comparative study was made on the drag reduction of both complex and nanofluids, where both were able to reduce drag, however at different concentrations. It could thus be concluded that combination of xanthan gum and Carbon nanotubes could reduce drag at a particular concentration

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Section: Fig 4 Influence Of Concentration On Torque With Respect Tomentioning

confidence: 70%

Section: Fig 4 Influence Of Concentration On Torque With Respect Tomentioning

confidence: 97%

Investigating the Drag Reduction Performance of Rigid Polymer–Carbon Nanotubes Complexes

Oluwasoga¹,

Abdulbari²

2016

JAFM

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“…It was found that the intrinsic concentration was an extremely useful quantity in normalizing the DR data for a homologous series of PIB, and the characteristic value (K) depended on the solvent system. A polysaccharide xanthan gum polymer in an aqueous solution was evaluated as a drag reducing agent using a rotating disk apparatus (RDA) (Sohn et al, 2001). The effects of various factors such as rotational disk speed, temperature, solution ionic strength, polymer concentration, and polymer molecular weight on the drag reduction efficiency were also investigated.…”

Section: Drag Reduction Using Rotating Disk Apparatus (Rda)mentioning

confidence: 99%

“…Choi et al, 1999;C. A. Kim et al, 1998;Sohn et al, 2001), and the drag reduction measurements were conducted at fixed rotational velocity of 1800 rpm, yielding a rotational Reynolds number of 9.6*10 5 . The guar gum stability with time was better than other water-soluble drag reducers [e.g., poly (ethylene oxide)], which means that it was more resistant to the mechanical stress than PEO.…”

Section: Drag Reduction Using Rotating Disk Apparatus (Rda)mentioning

confidence: 99%

Rotating Disk Apparatus: Types, Developments and Future Applications

Rashed¹,

Abdulbari²,

Salleh³

et al. 2016

MAS

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Power consumption reduction investigations attracted the attention of enormous numbers of researchers in the past few decades due to its high academic and economic impacts. The pumping power losses during the transportation of crude oils are considered as one of the main power consuming applications due to the turbulent mode of transportation. Investigating the possible solutions for this problem is expensive and time consuming due to the large apparatuses needed to simulate the flow in real pipelines. Rotating disk apparatus (RDA) is an instrument mainly comprising a rotating disk and an electrical motor to rotate the disk, which was implemented as an efficient and economical path to simulate what can be done in pipelines through generating a controlled degree of turbulence. This technique was also used in many other scientific applications due to its dynamic mode of operation. For example, a rotating disk electrode was used in electrodeposition processes and to characterize deposition film thickness and uniformity. The rotating disk reactor was employed to investigate the reaction rate between fluids and solid surfaces. The present work evaluates the RDA from different prospective and applications in order to introduce it as an efficient research tools for future dynamic investigations.

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“…The critical Reynolds number shows that the flow transfer from laminar to turbulent is 3 × 10 5 [4,19,36,37]. (5) torque sensor, (6) electric motor, (7) thermocouple, (8) controller interface, and (9) PC.…”

Section: Apparatus Descriptionmentioning

confidence: 99%

Enhancing the Drag Reduction Phenomenon within a Rotating Disk Apparatus Using Polymer-Surfactant Additives

et al. 2016

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Pipelines and tubes play important roles in transporting economic liquids, such as water, petroleum derivatives, and crude oil. However, turbulence reduces the initial flow rate at which liquids are pumped, thereby making liquid transportation through pipelines inefficient. This study focuses on enhancing the drag reduction (DR) phenomenon within a rotating disk apparatus (RDA) using polymer-surfactant additives. The complex mixture of polyisobutylene (PIB) and sodium dioctyl sulfosuccinate (SDS) was used. These materials were tested individually and as a complex mixture in RDA at various concentrations and rotational speeds (rpm). The morphology of this complex was investigated using transmission electronic microscopy (TEM). The reduction of the degradation level caused by the continuous circulation of surfactant additives in RDA could improve the long-term DR level. Experimental result shows that the maximum %DR of the complex mixture was 21.455% at 3000 rpm, while the PIB and SDS were 19.197% and 8.03%, respectively. Therefore, the complex mixture had better performance than these substances alone and were highly dependent on the alkyl chain of the surfactant.

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Drag-reduction effectiveness of xanthan gum in a rotating disk apparatus

Cited by 74 publications

References 37 publications

Investigating the Drag Reduction Performance of Rigid Polymer–Carbon Nanotubes Complexes

Investigating the Drag Reduction Performance of Rigid Polymer–Carbon Nanotubes Complexes

Rotating Disk Apparatus: Types, Developments and Future Applications

Enhancing the Drag Reduction Phenomenon within a Rotating Disk Apparatus Using Polymer-Surfactant Additives

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