Analysis of the effective viscosity of thin interlayers of aliphatic liquids in the fields of fluctuation forces generated by solid substrates

Altoiz, B. А.; Kiriyan, S. V.; Shatagina, E. A.

doi:10.1134/s1063784210100051

Cited by 8 publications

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“…The ELC layer parameters in such interlayers were determined within the framework of its simplified structural model as a homogeneous layer separated from the isotropic liquid by a phase boundary [3,4]. Results of Optical Measurements of Birefringence.…”

Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

“…2) was made within the framework of the "rheological" model of an interlayer with ELC layers of "constant viscosity" [4].…”

Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

“…Therefore the thickness of the ELC layers d decreases and the effective viscosity η eff → η b . For such a model a simple equation relating the thickness of model layers d in an interlayer of thickness D to its measured viscosity η eff (γ) was obtained [4]:…”

Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

“…In the present work, using polarimetry and viscosimetry methods [3][4][5], we investigated the birefringence and viscosity of interlayers (between metallic substrates) of two n-alkanes, * tridecane (C 13 H 28 ), and heptadecane (C 17 H 36 ), with a molecule chain length of 15 and 20 A°, respectively [6].…”

Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

“…The ELC layers of n-alkanes (and of aromatic compounds) formed in the field of the fluctuation forces of dielectric substrates have a parameter of the order of S 0.3, comparable with thermotropic liquid crystals, but small values of birefringence Δn 10 −4 and of the ELC thickness of a layer equal to d 10 −7 m, which increases with the molecule chain length [1]. The thickness of the ELC layer formed on a metallic substrate (in particular, for mineral oils [3] and n-hexadecane [4] in model friction triads) is an order of magnitude higher than the thickness of the layer formed on a dielectric substrate, but the influence of the molecule chain length on it has not been elucidated.…”

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Influence of the tridecane and heptadecane molecule chain length on the structural characteristics of their epitropic liquid-crystal layers

Kiriyan

Altoiz

Shatagina

et al. 2012

J Eng Phys Thermophy

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UDC 539.2:541.18The optical anisotropy and viscosity of micron interlayers, bounded by metallic substrates, of two n-alkane homologs -tridecane and heptadecane -have been measured. The thickness and characteristics of the orientational ordering of epitropic liquid-crystal layers formed on the substrates have been established. The structure parameters obtained are higher for heptadecane, which is attributable to the longer length of its alkyl chain.Introduction. The structural characteristics of epitropic liquid-crystal (ELC) layers [1] of saturated hydrocarbons incorporated into the composition of lubricating oils determine the wear-resisting properties of the latter [2]. The ELC layers of n-alkanes (and of aromatic compounds) formed in the field of the fluctuation forces of dielectric substrates have a parameter of the order of S 0.3, comparable with thermotropic liquid crystals, but small values of birefringence Δn 10 −4 and of the ELC thickness of a layer equal to d 10 −7 m, which increases with the molecule chain length [1]. The thickness of the ELC layer formed on a metallic substrate (in particular, for mineral oils [3] and n-hexadecane [4] in model friction triads) is an order of magnitude higher than the thickness of the layer formed on a dielectric substrate, but the influence of the molecule chain length on it has not been elucidated. Statement of the Problem and Research Subjects.In the present work, using polarimetry and viscosimetry methods [3-5], we investigated the birefringence and viscosity of interlayers (between metallic substrates) of two n-alkanes, * tridecane (C 13 H 28 ), and heptadecane (C 17 H 36 ), with a molecule chain length of 15 and 20 A°, respectively [6].

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Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

“…2) was made within the framework of the "rheological" model of an interlayer with ELC layers of "constant viscosity" [4].…”

Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

Section: Statement Of the Problem And Research Subjectsmentioning

confidence: 99%

mentioning

confidence: 99%

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Influence of the tridecane and heptadecane molecule chain length on the structural characteristics of their epitropic liquid-crystal layers

Kiriyan

Altoiz

Shatagina

et al. 2012

J Eng Phys Thermophy

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On the structure of waves at the charged interface between two viscous liquids at the solid bottom

2012

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INTRODUCIONAnalysis of physical regularities of the gravity-cap illary-fluctuation wave motion in a plane finite thick ness layer of a viscous conducting liquid is important for many technical and technological applications [1][2][3]. A large number of earlier publications have been devoted to the capillary-gravity flow in layers of a vis cous liquid [4][5][6][7], but the entire spectrum of the wave motion has not been covered. Nevertheless, it is well known [1-3] that in the short wavelength range (shorter that 10 nm [4]), it is the forces of fluctuation origin that are responsible for the generation of waves with the same dispersion relation as gravity waves [1,3]. Fluctuation forces appear near the surface of solids (solid bottom or solid wall) at distances of ~100 nm and cause a change in the physicochemical properties of liquids [2,[8][9][10]. The structures of the flows (regu larities of the distribution of the vortex and potential components of the velocity field over the layer thick ness) associated with the periodic wave motion of the free surface of the finite thickness layer of a viscous fluid was considered in [6]. It was found that the veloc ity field of the liquid flow associated with the capil lary-gravity wave propagating over the free surface of a layer of a viscous liquid on a solid bottom has a com plex structure. In this case, the vortex flow is concen trated in a small neighborhood of the free surface and in a small neighborhood of the bottom, while the potential flow fills the entire volume of the liquid. If the wavelength is much larger than the thickness of the liquid layer, the vortex flow generated by the surface wave fills the entire volume of the liquid, and the intensity of the vortex flow at the solid bottom may considerably exceed the flow intensity at the free sur face of the liquid. If, however, the layer thickness is much larger than the wavelength, the vortex flow is concentrated at the free surface, and its intensity at the bottom tends to zero. This circumstance can be inter preted as the statement that the surface wave "does not feel the bottom."The structure of the flows associated with the peri odic wave motion at the interface of two immiscible liquids was considered in [7]. It was found that the vor tex flow is concentrated in small neighborhoods of the interface on both its sides in layers with a thickness on the order of tenths of the wavelength (depending on the viscosity of the liquid). It also turned out that the curls of the velocity fields suffer a discontinuity in the vicinity of the interface upon a transition through it. The structure of the gravity-capillary-fluctuation wave motion must obey the same regularities. It differs from the capillary-gravity wave motion only in that the capillary wave motion as such, with a typical dis persion relation ω ∝ kω ∝ k 3/2 , is limited by the motion with the dispersion relation ω ∝ (ω is the wave fre quency and k is its wavenumber) both on the side of long waves and on the side of short waves [1,3,11].The features of the wa...

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On the effect of “Dead Water” in a stratified liquid on a solid bottom

et al. 2012

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Analysis of the effective viscosity of thin interlayers of aliphatic liquids in the fields of fluctuation forces generated by solid substrates

Cited by 8 publications

References 2 publications

Influence of the tridecane and heptadecane molecule chain length on the structural characteristics of their epitropic liquid-crystal layers

Influence of the tridecane and heptadecane molecule chain length on the structural characteristics of their epitropic liquid-crystal layers

On the structure of waves at the charged interface between two viscous liquids at the solid bottom

On the effect of “Dead Water” in a stratified liquid on a solid bottom

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