Method for measuring liquid flow property and apparatus for observing droplet

Abstract

A method for measuring a liquid flow property is provided. The method includes controlling a droplet to drop from a preset height to a substrate, acquiring a droplet density on the substrate, a maximum radius of a tip of the droplet, a real-time height of the tip, an initial height of the tip, and a testing duration from a beginning of the droplet to fall on the substrate to an end of a test, determining that influencing factors of the tip of the droplet comprise inertial force and viscous force, and the inertial force is equal to the viscous force, and calculating a calculated viscosity of the droplet, wherein the calculated viscosity of the droplet is related to a first calculation coefficient, the droplet density, the maximum radius of the tip and the initial height of the tip, and the first calculation coefficient is equal to a ratio of a tip height change value to the testing duration, wherein the tip height change value is a difference between the initial height of the tip and the real-time height of the tip.