Study On The Motion Characteristics Of Single Liquid Droplets In Non-newtonian Fluid

Aiming at the production of single droplet in the shear thinned fluid and the rising process was studied,through experiment and numerical simulation to obtain the shear thinned fluid in the shape of a single droplet motion trajectory,speed,and the flow field around the droplet,explores the rise around the droplet deformation,movement,in the process of liquid phase change law of flow field,analyses the shear thinned fluid concentration,initial droplet equivalent diameter of droplets,the influence of the flow field around the main content of this paper include:Droplet formation:comparing the droplet formation time,equivalent diameter and volume in the droplet formation process between sodium carboxymethyl cellulose solution and deionized water with different concentrations,the results showed that droplet formation time in deionized water was faster than that in sodium carboxymethyl cellulose solution.The increase of solution concentration will lead to the increase of equivalent diameter and generated volume.The increase of injection flow will lead to the decrease of equivalent diameter and generated volume.The increase of nozzle diameter will lead to the increase of equivalent diameter and generated volume.Droplet rise:the droplet shape,rising speed and movement trajectory were compared between sodium carboxymethyl cellulose solution and deionized water at different concentrations.The increase of initial equivalent diameter of droplet will lead to the increase of terminal velocity,and the increase of solution concentration will lead to the decrease of terminal velocity.The movement trajectory of droplets in deionized water oscillates periodically.The flow field around the droplet:the velocity component diagram in the x and y directions around the droplet in sodium carboxymethyl cellulose solution and deionized water with different concentrations,the velocity vector diagram and the flow diagram were compared.The results showed that the decrease of the power law exponential would lead to the increase of the velocity component in the x direction,the decrease of the velocity component in the y direction and the decrease of the velocity vector.The increase of equivalent diameter will lead to the increase of velocity component in x direction,velocity component in y direction and velocity vector.