On the measuring of film thickness profiles and local heat transfer coefficients in falling films

Åkesjö, Anders; Vamling, Lennart; Sasic, Srdjan; Olausson, Lars; Innings, Fredrik; Gourdon, Mathias

doi:10.1016/j.expthermflusci.2018.07.028

Cited by 17 publications

(2 citation statements)

References 40 publications

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“…Notice that the dimensional slip length b may have a range from 10 −9 m up to 10 −4 m for a superhydrophobic substrate [47]. However, there is also a variety of thin liquid film thicknesses from 10 −7 m (see [48]) up to 10 −4 m (see [49]) or more. Thus, the non dimensional parameter also has a wide range of magnitudes.…”

Section: Equations Of Motion and Evolution Equationmentioning

confidence: 99%

Marangoni stability of a thin liquid film falling down above or below an inclined thick wall with slip

Dávalos-Orozco

2023

Meccanica

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The linear and nonlinear instability of a thin liquid film flowing down above or below (Rayleigh-Taylor instability) an inclined thick wall with finite thermal conductivity are investigated in the presence of slip at the wall-liquid interface. A nonlinear evolution equation for the free surface deformation is obtained under the lubrication approximation. The curves of linear growth rate, maximum growth rate and critical Marangoni number are calculated. When the film flows below the wall it will be subjected to destabilizing and stabilizing Marangoni numbers. It is found that from the point of view of the linear growth rate the flow destabilizes with slip in a wavenumber range. However slip stabilizes for larger wavenumbers up to the critical (cutoff) wavenumber. From the point of view of the maximum growth rate flow slip may stabilize or destabilize increasing the slip parameter depending on the magnitude of the Marangoni and Galilei numbers. Explicit formulas were derived for the intersections (the wavenumber for the growth rate and the Marangoni number for the maximum growth rate) where slip changes its stabilizing and destabilizing properties. From the numerical solution of the nonlinear evolution equation of the free surface profiles, it is found that slip may suppress or stimulate the appearance of subharmonics depending on the magnitudes of the selected parameters. In the same way, it is found that slip may increase or decrease the nonlinear amplitude of the free surface deformation. The effect of the thickness and finite thermal conductivity of the wall is also investigated.

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Section: Equations Of Motion and Evolution Equationmentioning

confidence: 99%

Marangoni stability of a thin liquid film falling down above or below an inclined thick wall with slip

Dávalos-Orozco

2023

Meccanica

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“…Arjun Jayakumar et al [7] developed a non-intrusive technique to measure film thickness of the horizontal tube with Re ranging from 130 to 350. Anders Åkesjö et al [8] adopted two measurement procedures to expound the features of vertical falling films, the film thickness was measured continuously along a 0.10 m long vertical line.…”

Section: Introductionmentioning

confidence: 99%

Impact of winding angle on falling film thickness in spiral wound heat exchangers

Na¹,

He²,

Chen³

et al. 2021

Preprint

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Characterization of Thin Film Over Vertical Fluted Tube: An Experimental Approach

Deharkar

Mudgal

Patel

et al. 2022

Lecture Notes in Mechanical Engineering

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On the measuring of film thickness profiles and local heat transfer coefficients in falling films

Cited by 17 publications

References 40 publications

Marangoni stability of a thin liquid film falling down above or below an inclined thick wall with slip

Marangoni stability of a thin liquid film falling down above or below an inclined thick wall with slip

Impact of winding angle on falling film thickness in spiral wound heat exchangers

Characterization of Thin Film Over Vertical Fluted Tube: An Experimental Approach

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