Thermo-Marangoni flows induced by a heated plate at a moving contact line

Mechanical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102

Abstract

The aim of the study is to analyze the flow near the contact line when a heated rectangular plate moves vertically in its own plane into a waterbody. The temperature difference between the water and the plate varies as the plate moves at different constant speeds. This temperature difference causes a Thermo-Marangoni flow near the contact line, the magnitude and direction of which depends on the temperature gradient. The plate speed is between 0.1 mm/s to 2 mm/s which in turn affects the flow speed. The flow field is measured using a MATLAB application-based particle-induced velocimetry technique (PIV). The velocity is obtained on a plane perpendicular to the water surface, and the temperature distribution is measured on the water surface using an infrared thermal camera. The latter is used to estimate the strength of the thermo-Marangoni contribution.