Analysis of the effect of hydrophobic properties of surfaces in the flow part of centrifugal pumps on their operational performance

Волков, А. В.; Parygin, A. G.; Lukin, M. V.; Ryzhenkov, A. V.; Хованов, Г. П.; Naumov, A. V.; Šoukal, Jiří; Pochylý, František; Fialová, Simona

doi:10.1134/s0040601515110105

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…[18] PIV ölçüm tekniği ile süperhidrofobik yüzeyde hidrofilik yüzeye oranla %10, Volkov vd. [19] ise aynı özellikteki hidrofobik yüzeylerin hidrolik sürtünmeyi %15.5-23 oranında düşürdüğünü kaydetmişlerdir.…”

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Experimental Investigation of the Effect of Hydrophobic Surfaces On Friction Losses in Turbulent Pipe Flows

Pehlıvan

Özbey

2022

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Bu çalışmada, pürüzsüz bakır boru iç yüzeyi hidrofobik özellik kazandırılacak şekilde kaplanarak türbülanslı akımda basınç kaybı ve sürtünme faktörü üzerindeki etkisi deneysel olarak incelenmiştir. Kaplama malzemesi olarak floroidetilenpropilen (FEP) ve bu temel malzemeye ağırlıkça %1 oranda grafen (FEP-G) ve grafit (FEP-C) ekleyerek elde edilen solüsyonlar kullanılmıştır. FEP, FEP-G ve FEP-C malzemeleri ile pürüzsüz bakır boru iç yüzeyleri sprey yöntemi ile kaplanıp 400 °C sıcaklıkta kurutularak hidrofobik yüzeyler elde edilmiştir. İşlenmemiş konvansiyonel pürüzsüz bakır yüzeyi ile FEP, FEP-C ve FEP-G kaplı yüzeylerin hidrofobikliği temas açıları sırasıyla 65°, 93°, 96° ve 102° olarak ölçülerek belirlenmiştir. Türbülanslı akımda, 5000 – 30000 Reynolds sayıları aralığında deneysel olarak basınç kayıpları ölçülerek sürtünme faktörü belirlenmiştir. FEP, FEP-C ve FEP-G kaplı hidrofobik yüzeyler, konvansiyonel bakır yüzeye kıyasla 5000 – 30000 Reynolds sayısı aralığındaki türbülanslı akımda %7 - %36.1 aralığında sürtünme faktöründe bir azalma göstermiştir.

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Section: 𝑚 =unclassified

Experimental Investigation of the Effect of Hydrophobic Surfaces On Friction Losses in Turbulent Pipe Flows

Pehlıvan

Özbey

2022

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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“…Numerical investigation on the pump with different values of adhesive coefficient shows that adhesive coefficient reduction significantly affects the hydraulic efficiency of the centrifugal pump, by hydraulic lowering losses. Adhesive coating shows a positive effect on cavitation [11]. From the investigation of the effect of surface roughness on contact angle and sliding angle of a water droplet with the surface, it is observed that in the highly hydrophobic region, the sliding angles of water droplets decrease with increasing contact angle, which is considered to be dependent on the surface roughness [12].…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of centrifugal pump by minimizing casing losses using coating

Deshmukh¹,

Deshmukh²,

Mandhare³

2020

SN Appl. Sci.

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Present study focuses on the experimental and numerical investigation of the effect of surface roughness of casing and adhesive coating on the efficiency of centrifugal pump. It consists of two parts; in the first part, effect of coating centrifugal pump casing by ultra-smooth ceramic based coating on the efficiency of the centrifugal pump is investigated experimentally. In the second part, effect of change in surface roughness of casing is investigated numerically by using the CFD tool. The surface roughness of casing is modeled in terms of effective sand grain size parameters and investigated by solving Reynolds-averaged Navier-Stokes equation at volume mesh. Effects of three surface roughnesses, i.e., 100 μm, 200 μm and 300 μm, are investigated numerically. It is observed that surface roughness of casing has considerable effect on pump performance, and pump head decreases by 9.06-14.73% by change in surface roughness from 100 to 300 μm for different mass flow rates values. For same flow rate, centrifugal pump with coated casing produces more head than that of pump without coating. Coating casing with the ultra-smooth adhesive material results in maximum efficiency enhancement of 9.6%.

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“…Other authors also interested in the solution of this problematic were focused especially on the determination of adhesive coefficient for example by Fialova´, 16 and Pochyly´et al 17 and friction losses for example work by Ou et al, 18 Daniello et al 19 and Volkov et al 20 A complex study of the dependence of the liquid flow on the hydrophobic surface is presented by Pochyly´et al 17 and Akcabay et al 21 where the effect of hydrophobic surface on the creation of cavitation is emphasized. Recent research in this field is shown for example in works.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis and simulations of the magnetic field and hydrophobicity effect on the journal bearing dynamics

Fialová

Pochylý

Malenovský

2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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The article contains mathematical models of Reynolds equation with the effects of hydrophobicity of surface and magnetic field. The first section provides a new mathematical model of the solution of the generalized Reynolds equation and its application for a hydrophilic surface. It also derives a new boundary condition for the contact of a flowing liquid with a hydrophobic surface. This wettability condition is defined in dependence on the adhesion coefficient k. The second part presents mathematical models of Reynolds equation including the effect of hydrophobia and magnetic field. For all problems, the solutions are shown and the definitions of the stiffness and damping matrices of the liquid layer are outlined. From the results, it can be deduced that hydrophobic surface significantly affects the velocity profile of the liquid. It leads to a higher effect of the Lorentz force and thus of the magnetic field in comparison with a hydrophilic surface of the bearing lining.

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Analysis of the effect of hydrophobic properties of surfaces in the flow part of centrifugal pumps on their operational performance

Cited by 10 publications

References 10 publications

Experimental Investigation of the Effect of Hydrophobic Surfaces On Friction Losses in Turbulent Pipe Flows

Experimental Investigation of the Effect of Hydrophobic Surfaces On Friction Losses in Turbulent Pipe Flows

Performance enhancement of centrifugal pump by minimizing casing losses using coating

Numerical analysis and simulations of the magnetic field and hydrophobicity effect on the journal bearing dynamics

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