Spreading Modes on Copper and Steel Surfaces

Abstract

Abstract. This work presents the experimental results of the studying the effect of surface roughness, microstructure and liquid flow rate on the dynamic contact angle during spreading of distilled nondeaerated water drop on a solid horizontal substrate. Copper and steel substrates with different roughness have been investigated. Three spreading modes were conventionally indicated. It was found that the spreading of drops on substrates made of different materials occurs in similar modes. However, the duration of each mode for substrates made of copper and steel are different. Spreading of a liquid above the asperities of a surface micro relief was observed to be dominant for large volumetric flow rates of drops (0.01 ml/s). Liquid was spreading inside the grooves of a rough substrate at low rates (0.005 ml/s).

Contact angle hysteresis of a drop spreading over metal surfaces

“…To investigate the dynamics of a drop spreading on substrates, the experimental set-up presented in Figure 2 was used [14,15]. The study is based on the use of the shadow optical method for obtaining the drop profiles.…”

Experimental determination of change in the liquid layer thickness on the heated surface by confocal sensor

“…Due to this effect, high intensity of heat removal during evaporation of thin liquid layers provides keeping of the required temperature mode of the element. There are many studies in this scientific field [15][16][17][18][19]. Scientific and technological progress contributes to the emergence of inexpensive high-precision equipment, such as confocal sensors.…”

Obtaining molybdenum-copper composite for effective thermal control in electronic systems

“…Indeed, the insufficient cooling negatively affects the reliability and efficiency of semiconductor components [1,2]. According to statistical data, more than half of the electronic components failure cases are explained with the increased temperature.…”