Circulation, Diffusion, and Reaction Within a Liquid Trapped in a Cavity

Chilukuri, R.; Middleman, Stanley

doi:10.1080/00986448308940051

Cited by 14 publications

(8 citation statements)

References 7 publications

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“…In contrast, during the removal of the oil residues the external solvent flow might cause fluid circulation in the cavities resulting in enhanced removal of the liquid contaminant. This has been reported by Chilukuri and Middleman (1982) in studies of liquids trapped in cavities. Nonionic surfactants are often used to remove oily residues from solid surfaces (Beaudoin et al, 1995).…”

Section: Resultssupporting

confidence: 71%

Removal of oil films from stainless steel tubes

1997

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The removal of oil films from the inner surface of a stainless steel tube cell using aqueous cleaning solutions was studied. The two oils used in the cleaning experiments, Sunquench 1042 and heavy mineral oil, contained P32 labeled tributyl phosphate (TBP) as a radioactive tracer. The β‐ particles emitted from the radioactive TBP were detected by a CaF2 scintillator and used as a measure of the amount of oil remaining in the tube cell. Cleaning experiments performed at different flow rates, surface treatment, and surfactant concentrations indicated that initially the oil films were removed rapidly. At the end of the experiments, the oil removal rate reduced significantly, eventually becoming negligible. The stainless steel morphology affected oil removal significantly, and the rougher tube tended to retard the oil removal. The rate and extent of the decontamination were significantly increased in the presence of sodium dodecyl sulfate, a nonionic surfactant. Experimental data were compared to a hydrodynamic model based on the removal of a liquid contaminant from a solid surface by an immiscible fluid. The model deviated from the experimental data due to the presence of instabilities at the oil‐water interface.

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Section: Resultssupporting

confidence: 71%

Removal of oil films from stainless steel tubes

1997

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“…These particles can be further removed by introducing the buoyancy force on the particles. This can be done by heating up the bottom wall to induce diffusion effect on the fluid as proposed by Chilukuri and Middleman (1983). Further discussion on this subject will be our next research topic.…”

Section: Discussionmentioning

confidence: 99%

Computational Analysis of Particulate Flow in Expansion Channel

Sidik¹,

Jahanshaloo

2013

American Journal of Applied Sciences

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Computational prediction of fluid-solid particle interaction in an expansion horizontal channel with wide range of Reynolds numbers. Lagrangian-Lagrangian numerical technique to predict the movement of solid particle. The method is based on mesocale scheme of lattice Boltzmann method for prediction of fluid dynamics and second Newton's law for the dynamics of solid particles. The flow behaviour at the downstream of the expansion channel is critically dependence on the Reynolds number of the flow. The removal percentage of the contaminant critically dependence on the flow structure donwstream of the expansion channel. The strength of recirculation region plays significant role due to the step in the cavity.

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“…However, most studies to date have been concerned with the problem of Poiseuille ow over a cavity. Chilukrishna and Middleman [12] have pointed out that hydrodynamic cleaning of a surface frequently involves the use of a brush, squeezed mop or a rotating drum. In these situations the layer of uid between the solid surface and applicator is quite small and the ow next to the surface can be considered as Couette ow.…”

Section: Introductionmentioning

confidence: 99%

Effect of duct velocity profile and buoyancy‐induced flow on efficiency of transient hydrodynamic removal of a contaminant from a cavity

Fang

2004

Numerical Methods in Fluids

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SUMMARYThis paper describes a preliminary numerical analysis of the e ect of duct velocity proÿle and buoyancyinduced ow generated by the heat source on hydrodynamic removal of contaminants contained in cavities. The process of uid renewal in a cavity is modelled via a numerical solution of the NavierStokes equations coupled with the energy equation for transient ows. The foulant has the same density as the uid in the duct and the duct velocity proÿle is considered to be Poiseuille ow and Couette ow, respectively. The results show that the change in Grashof number and duct ow velocity proÿle causes a dramatic di erence in the observed ow patterns and cleaning e ciency. From a cleaning perspective, the results suggest that Couette ow at higher value of Grashof number becomes more e ective in further purging of contaminated uid from a cavity.

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Circulation, Diffusion, and Reaction Within a Liquid Trapped in a Cavity

Cited by 14 publications

References 7 publications

Removal of oil films from stainless steel tubes

Removal of oil films from stainless steel tubes

Computational Analysis of Particulate Flow in Expansion Channel

Effect of duct velocity profile and buoyancy‐induced flow on efficiency of transient hydrodynamic removal of a contaminant from a cavity

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