Investigation of drop dynamic contact angle on copper surface

Abstract

Abstract. This paper presents experimental results of the studying the effect of surface roughness, microstructure and flow rate on the dynamic contact angle at spreading of distilled non deaerate water drop on a solid horizontal substrates. Copper substrates with different roughness have been investigated. For each substrate static contact angles depending on volume flow rate have been obtained using shadow system. Increasing the volume flow rate resulted in an increase of the static contact angle. It was found that with increasing surface roughness dynamic contact angle arises. Also difference in formation of the equilibrium contact angle at low and high rates of drop growth has been detected.

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.…”

Substrate Wetting Under the Conditions of Drop Free Falling on a Heated Surface

“…1. The operating principle is given in detail in [3,4]. The main elements of experimental setup are light source 1, condensing lens 5, test cell consisting of the substrate 4 and transparent box 6, high-speed video camera 7.…”

“…The operation of thermal engineering equipment in various industries is accompanied by the release of heat [1][2][3][4][5][6][7]. Timely heat removal from the equipment of manufacturing line provides required operating mode.…”

Change of Dynamic Contact Angle of a Drop Spreading over Copper Surface

“…The operating principle is given in detail in [14]. The surface profile and roughness parameter (arithmetic average roughness Ra) are obtained on the profilometer "Micro Measure 3D station" (Table 1).…”