When a stream of liquid hits an object on a given surface, where can one expect the greatest pressure of liquid? Would it be directly on the object? Perhaps right above, or below it? Let’s say the surface is porcelain and slightly concave, perhaps in the shape of a bowl, and the mission is to remove said object from said surface with approximately 1000 milliliters of water-like fluid taking approximately 15 seconds to evacuate from its source.
The static pressure in a free jet is equal to the ambient pressure. There are no areas in the stream with a higher pressure than the air around it. However, there are areas of increased dynamic pressure. That would simply be any part of the fluid that is moving the fastest. The greatest force you can apply to an object would be found by hitting it with the fastest stream possible, and the fastest part of that stream.
But bear in mind that if the object in question is stuck on the surface, like a piece of chewing gum on a wall, then removing it with a jet of liquid isn’t really about pressure, or even momentum, as much as it’s about shear stress. And in that case, you’ll probably have the best luck hitting a spot just next to the object in question. This lets the sideways flow created from the impinging jet wash over the object. This creates shear stresses on the surface that will scrub off the material.
And, seriously…a liter?! You need to cut back on the iced tea.
Perhaps he’s Powered by Budweiser™
I will try the different suggestions and report back the results. I refuse to give in to the Clorox wipey at this time.