Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Nanoscience and Technology: An International Journal
ESCI SJR: 1.031 SNIP: 1.517 CiteScore™: 0.7

ISSN Imprimer: 2572-4258
ISSN En ligne: 2572-4266

Nanoscience and Technology: An International Journal

Précédemment connu sous le nom Nanomechanics Science and Technology: An International Journal

DOI: 10.1615/NanomechanicsSciTechnolIntJ.v6.i4.60
pages 319-334

INTENSIFICATION OF MASS TRANSFER IN LAMINAR AND TURBULENT CHANNEL FLOWS BY APPLYING SUBMICRON CAVITIES ON THE CHANNEL WALL SURFACE

V. A. Aleksin
A. Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, 101/1 Vernadskii Ave, Moscow, 119526, Russia
A. A. Markov
A. Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, 101/1 Vernadskii Ave, Moscow, 119526, Russia

RÉSUMÉ

A model of reduction of the friction drag in laminar and turbulent liquid and gas flows in channels by creating air-filled microcavities (micropores) on the channel walls and applying, to the surface, special coatings consisting of hydrophobic (water repellent) materials with organized structure of cavities of submicron size is suggested. It is proposed to use the slip parameters of gas phase on the surface of micropores at large Knudsen numbers. The value of the macrointensity of slip on the pipe wall has been found by applying averaging of gas microflows and gas velocity gradients in nanocavities on the basis of the model of mutually penetrating continua of the solid and gas phases. The detailed structure of gas flows in the cavities is not considered. The intensities of the slip processes are presented in dimensionless variables as functions of the coefficients of gas molecules reflection from the cavity surfaces. Calculations of the mass transfer rate were made with varied intensities of slip processes. The theoretical model makes it possible to predict the characteristics of mass transfer intensification both at small and large Reynolds numbers. The possibilities of applying the differential model of turbulence in the case of simultaneous action of two factors − the high intensity of turbulence in the incoming flow and slip on the wall − have been established.


Articles with similar content:

PROCESSES OF HEAT TRANSFER AND DISPERSION INSIDE AN INTERNAL ROTOR MIXER
Composites: Mechanics, Computations, Applications: An International Journal, Vol.5, 2014, issue 2
A. V. Baranov , O. Kh. Dakhin
GAS FLOW AND DIFFUSION IN NANO-SIZED CAPILLARIES AND POROUS BODIES
Nanoscience and Technology: An International Journal, Vol.1, 2010, issue 1
Vjacheslav Roldughin, V. M. Zhdanov
GAS FLOW AND DIFFUSION IN NANO-SIZED CAPILLARIES AND POROUS BODIES
Nanoscience and Technology: An International Journal, Vol.1, 2010, issue 2
Vjacheslav Roldughin, V. M. Zhdanov
SIMULATION OF HEAT AND MASS TRANSFER IN PORES AS APPLIED TO SYNTHESIS OF MAGNESIUM−ZINC AND NICKEL−ZINC FERRITE NANOPARTICLES
Nanoscience and Technology: An International Journal, Vol.6, 2015, issue 3
A. A. Markov, K. S. Martirosyan, M. A. Hobosyan
EFFICIENCY OF FILM COOLING WITH INFLUENCE OF SURFACE ROUGHNESS
International Heat Transfer Conference 10, Vol.6, 1994, issue
M. I. Osipov