Measuring deformations of the heated liquid film by the fluorescence method

Chinnov, E. A.; Kharlamov, S. M.; Saprykina, A. V.; Zhukovskaya, O. V.

doi:10.1134/s0869864307020102

Cited by 15 publications

(10 citation statements)

References 8 publications

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“…Johnson et al (1997Johnson et al ( , 1999 developed a fluorescence imaging system to quantify the transient behavior of thin film flows over flat surfaces under an isothermal condition. Essentially the same fluorescence imaging approach has also been used recently by Lel et al, (2005), Chinnov et al, (2007), and Schagen et al, (2007) to conduct thickness measurements in film flows at various experimental settings. It should be noted that the fluid flows are usually required to be transparent in order to be able to use fluorescence imaging technique to achieve quantitative film thickness distribution measurements.…”

Section: Literature Review Of the Film Thickness Measurement Techniquesmentioning

confidence: 93%

Development of Digital Image Projection Techniques to Quantify Surface Film/Rivulet Flows

Wang

Lohry

Zhang

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

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A novel digital fringe projection (DFP) technique is developed to achieve non-intrusive thickness measurements of wind-driven water droplet/rivulet flows in order to quantify the unsteady surface water transport process pertinent to aircraft icing phenomena. The DFP technique is based on the principle of structured light triangulation in a similar manner as a stereo vision system but replacing one of the cameras for stereo imaging with a digital projector. The digital projector is used to project a fringe pattern of known characteristics onto a test object (i.e., a water droplet/rivulet on a test plate for the present study). Due to the 3D shape profile of the test object, the fringe pattern is deformed seen from a perspective different from the projection axis. By comparing the distorted fringe pattern over the test object (i.e., the water droplet/rivulet on the test plate) and a reference fringe pattern on a reference plane (i.e., the test plate only without the water droplet/rivulet), the 3D profile of the test object with respect to the reference plane (i.e., the thickness distribution of the water droplet/rivulet flow) can be retrieved quantitatively and instantaneously. The feasibility and implementation of a DFP system is first demonstrated by measuring the thickness distribution of a small flat-top pyramid over a test plate to evaluate the measurement accuracy level of the DFP system. Then, the DFP system is applied to achieve time-resolved thickness distribution measurements of a droplet/rivulet flow to quantify the transient behavior of the water droplet/rivulet flow driven by boundary layer airflow over a test plate. The dynamic shape change and stumbling runback motion of the wind-driven water droplet/rivulet flow over the test plate are revealed clearly and quantitatively from the DFP measurement results. Such information is highly desirable to elucidate underlying physics to improve our understanding about the surface water transport process pertinent to glaze ice formation and accretion over aircraft wings in atmospheric icing conditions

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Section: Literature Review Of the Film Thickness Measurement Techniquesmentioning

confidence: 93%

Development of Digital Image Projection Techniques to Quantify Surface Film/Rivulet Flows

Wang

Lohry

Zhang

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

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“…Possible application of the fluorescent method for diagnostics of nonisothermal films was qualitatively demonstrated in [19]. In contrast to conventional schemes in [2,20], radiation source and detector were positioned from one side of the film surface [21]. Rhodamine 6Zh, which is not a surfactant and whose fluorescent properties do not depend on temperature at low concentrations of solution, was used as a dye.…”

Section: Experimental Setup and Measurement Methodsmentioning

confidence: 99%

The effect of wave characteristics on rivulet formation in heated liquid films

Chinnov

2009

Thermophys. Aeromech.

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Formation of rivulets on the surface of non-isothermal water film falling vertically over the heaters with different sizes and boundary conditions was studied experimentally. The distances between rivulets were measured depending on Reynolds number, heat flux density and film path (a distance between the lower edge of a film-former nozzle and the measurement point of film flow characteristics). The breakdown of solitary waves at liquid film heating was revealed. Four zones of film path influence on rivulet formation were distinguished.

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“…One of the latest theoretical papers [4] confirms the existence of two types of structures on the surface of a nonisothermal liquid film. It is shown that in the thermocapillary regime the wavy flow decays, and in the thermocapillary-wave regime, the waves propagate along the rivulets.…”

Section: Introductionmentioning

confidence: 96%

The influence of the physical properties of the liquid on the formation of thermo-capillary structures

Chinnov

Semenov

2017

EPJ Web Conf.

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Abstract. An experimental study of the formation of thermocapillary structures at low Reynolds numbers and temperature gradients at the surface of the film in a wide range of the viscosity of the liquid was carried out. The data on the distance between the rivulets are generalized. It is shown that the transverse dimension of structures is determined by the capillary constant and does not depend on either the viscosity of the liquid or the flow rate.

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Measuring deformations of the heated liquid film by the fluorescence method

Cited by 15 publications

References 8 publications

Development of Digital Image Projection Techniques to Quantify Surface Film/Rivulet Flows

Development of Digital Image Projection Techniques to Quantify Surface Film/Rivulet Flows

The effect of wave characteristics on rivulet formation in heated liquid films

The influence of the physical properties of the liquid on the formation of thermo-capillary structures

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