- #1
Red_CCF
- 532
- 0
Hi
1. I was wondering why Bernoulli’s equation does not work for unsteady flows (where there is acceleration). If there was a horizontal pipe initially at steady flow, if the pressure at one end suddenly increases to cause a constant acceleration for the entire fluid body in the pipe (say from t = 0 to t = 5), why can’t I analyze the properties of flow using bernoulli’s equation at an instant of time (e.g. t = 2)?
2. I was wondering if there is a relationship between viscosity (internal friction) and pipe friction for flow in a pipe? i.e. can there exist pipe friction for inviscid flows?
3. This may be related to the above question but, what is the relationship between viscosity and the ability for a fluid to stick to a solid surface (like when fluid is placed between two plates and the plates are sheared, a velocity gradient is produced due to fluids sticking to the plates)?
Any help is appreciated
Thanks in advance
1. I was wondering why Bernoulli’s equation does not work for unsteady flows (where there is acceleration). If there was a horizontal pipe initially at steady flow, if the pressure at one end suddenly increases to cause a constant acceleration for the entire fluid body in the pipe (say from t = 0 to t = 5), why can’t I analyze the properties of flow using bernoulli’s equation at an instant of time (e.g. t = 2)?
2. I was wondering if there is a relationship between viscosity (internal friction) and pipe friction for flow in a pipe? i.e. can there exist pipe friction for inviscid flows?
3. This may be related to the above question but, what is the relationship between viscosity and the ability for a fluid to stick to a solid surface (like when fluid is placed between two plates and the plates are sheared, a velocity gradient is produced due to fluids sticking to the plates)?
Any help is appreciated
Thanks in advance