I took a rough stab at this using simple F=ma neglecting viscosity / flow restriction. At a pressure difference of 14.7psi across the needle, the time to get to a fully restricted flow rate of 4mL/sec comes out to be 0.02 ms. This illustrates to me that the inertial mass of the fluid in the...
Danger,
That's quite a story. I've read about the effect that you are talking about being due to huge releases of energy creating shock waves as a result of cavitation. Cavitation as I understand is the process of creation and destruction of bubbles due to low pressures. In your case, the shock...
This is helpful. Since (40N-5N)>0.5N, I assume that the pressure will drop close to vacuum rather quickly, and gas (water vapor or other gas) will fill the part of the barrel volume that has not yet been occupied by water flowing in from the needle. I witnessed this exact effect on a regular...
That pressure difference comes out to be 5000psi. Where did the 35/8 come from? Per your suggestion I did the Poiseuille calculation and got a pressure that varies linearly with volumetric flow rate. It comes out to be 3.8 psi (0.026N/mm^2) for 1 cm^3/s (1mL/s). Am I to conclude that the answer...
I am an engineer (MS) with no background in fluid dynamics. I am analyzing a microsyringe application for my company. Consider the following:
I have a tiny horizontal syringe (no gravity effect). Initially the plunger is fully pushed in, such that there is no air or liquid in the barrel, and...
Is this switch is electromechanical or purely electronic? In purely electronic switches, negative side aka "low-side" switches can be simpler to implement usually. One reason might be that they don't need any voltage to be in the "off-state" but they need a positive control voltage to turn on...