Experimental study of wave characteristics on a thin layer of de/anti-icing fluid

Abstract

Several series of experiments were conducted in order to investigate wave formation and wave characteristics on a thin layer of de/anti-icing fluid using a nonintrusive technique. The configuration consists of a thin layer of de/anti-icing fluid deposited on the lower wall of the wind tunnel section, sheared by a turbulent airflow. Beyond a critical value of the wind speed, two-dimensional surface waves could be observed. The characteristics of these waves like the wavelength and the wave speed could be measured using the light absorption technique. The main purpose of the study is to augment the already existing experimental data for wave characteristics of Newtonian liquid layers in the literature. The non-Newtonian character and the high viscosities of the fluids used render these experiments and their results original. The results obtained from the experiments have been compared with the results of an already existing code utilizing linear stability theory and the agreement was seen to be very good provided that the liquid film is not too thin.

Eigenspectra and mode coalescence of temporal instability in two-phase channel flow

“…(23), the first three terms constitute the particular solution. The term of zero degree in y is taken to be zero, as demanded by condition (12). Boundary conditions (10), (11), and (14) assume the forms…”

“…Electronic mail: ariaz@umd.edu values of the Reynolds number. For large values of the Reynolds number, Özgen et al 12 found that shear modes dominate the instability behavior in the case of gas boundary layer over a newtonian liquid.…”

Bioinspired Surfaces with Superwettability for Anti‐Icing and Ice‐Phobic Application: Concept, Mechanism, and Design

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] When ice accumulates on the wings of aircraft, turbine engine structures, or insulators and transmission lines on power systems, it will impose serious problems and cause some disastrous damage in the aircraft and power industry. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] In the winter of 2008-2009, frozen rain lasted for more than three weeks in Hunan and Jiangxi provinces, causing downfall of 37% of Ice accumulation poses a series of severe issues in daily life. Inspired by the nature, superwettability surfaces have attracted great interests from fundamental research to anti-icing and ice-phobic applications.…”

Measurement of Liquid Film Thickness via Light Absorption and Laser Tomography

“…In the LAbs technique the film thickness is retrieved by measuring the intensity of the light transmitted through the liquid film. Developed as a point-wise technique, using photodiods or photomultipliers as light receivers [14,15], the LAbs has later become a full field technique using digital video cameras and basic image processing operations [17][18][19]. While this method can provide high spatial and temporal resolution, its main limitation is in the assumption that the light transmittance is solely linked to light absorption, disregarding spurious effects such as light refraction, reflection or scattering.…”

“…Time resolved, 2D and 3D film thickness measurements were performed using two measurement techniques. The first technique is the light absorption (LAbs), implemented in the 3D version used in [17][18][19]; the second technique is an adaptation of a visualization method based on planar laser-induced fluorescence (PLIF) and image processing, referred to as level detection and recording (LeDaR, [23][24][25]). In the LAbs technique the film thickness is retrieved by measuring the intensity of the light transmitted through the liquid film.…”