Static Contact Angle and Large Water Droplet Thickness Measurements with the Change of Water Temperature

Abstract

The sessile droplet method is used to
determine the contact angle and the thickness
of a large droplet of water (puddle), and the
contact angle of a growing droplet
experimentally. The measurements are done as
the water temperature is varied within the range
of 0-90 Co. Five kinds of substrates are used
(iron, copper, aluminum, glass and brass) in the
present work. It is found that as the temperature
of the water increased both the contact angle
values and puddle thickness values are
decreased. Also it is shown that the contact
angle is starting from 90o for very small
droplets to a steady value as the droplet
increases in size. A curve fitting is done to
obtain correlationsfor the variation of contact
angle with water temperature values.