Ohnesorge number

Okay kiddo, have you ever played with a toy boat in a bathtub or a pool? When you move your hands in the water, you might have noticed that the water moves too. This moving water creates something called "fluid friction". The Ohnesorge number helps us understand more about fluid friction when we have a liquid that is moving really fast.

Now imagine you have some syrup and some water. If you try to stir them both with a spoon, you'll notice that the syrup is much thicker than the water and moves more slowly. The syrup has a higher viscosity than the water. The Ohnesorge number helps us understand how much thickness or viscosity a liquid has and how that affects how easily it flows.

So if we mix the syrup with water and create a mixture with a certain speed of movement or "velocity", the Ohnesorge number helps us calculate how much the mixture will splash, how much it will stick to the sides of the container, or how much it might evaporate. Think of it like trying to measure how much of the syrup sticks to the spoon when you stir it. Some spoons might pick up more syrup than others, and the Ohnesorge number helps us understand why.

Scientists and engineers use the Ohnesorge number to help design things like airplanes, boats, or rockets that need to move through thick, viscous liquids like fuel or oil. By understanding more about how these liquids flow and move, we can design things that work better and more efficiently.

So that's what the Ohnesorge number is all about - helping us understand more about how liquids flow and move, especially when they are really thick and viscous.