The benefits of a droplet generator
Producing small droplets of fluid can be a tedious process, which is hard to get right consistently. The conventional methods are usually slow and inconsistent, which is why using a droplet generator is quite an advancement. These generators are small chips, which cleverly use small channels to modify fluids. And because they work on a very small scale, the results are always the same, resulting in very highly reproducible droplets. A droplet generator is therefore an excellent replacement for conventional methods. It is smaller, more reliable and faster in almost every situation.
Parameters of a droplet generator
As said before, a droplet generator uses channels to modify fluids to form droplets. Usually a generator starts with a larger droplet of the fluid used in the generator. This is then split using precisely formed channels, that basically forms the bigger droplet into a smaller one. This process can then be repeated to generate smaller droplets. Of course, the real dynamics of this process are more complicated than described here. Using several parameters the size of the droplets can be adjusted. Usually the relative viscosities, surface tension, and velocities between the dispersed and the continuous phase droplets are adjusted to produce different sizes of droplets. Of course this does depends on the kind of liquid used.
Another important factor that has to be taken into consideration is the flow rate of the liquid used. There are two important types of geometry that droplet generators are designed with. These two types are focused flow and T-junction. The choice between these two depends on many variables, but the important difference between them is how they react to flow rates. A T-junction is often used with slow flow rates, whereas the focused flow geometry tends to provide a more stable droplet production at higher flow rates.