The discussion revolves around calculating the pressure required to move a column of white lithium grease, specifically focusing on the factors that influence this pressure. Participants explore various considerations such as friction, viscosity, and temperature, as well as the complexities involved in deriving a formula for this calculation.
Participants generally agree that multiple factors influence the pressure calculation, and there is recognition that the problem is complex. However, no consensus is reached on a specific formula or approach, and various viewpoints remain regarding the significance of different factors.
Participants acknowledge that many potential factors may be negligible, but a complete understanding of all variables is necessary before determining their impact on the pressure calculation.
What factors have you identified that will have an effect on the answer?Tritkoss said:Good day. My question is as follows, I have a column of white lithium grease 1/4” diameter 24’ long. I want to figure out the pressure needed to move this column of grease. I am having a hard time to find the right formula to calculate this so any help will be greatly appreciated. Thank you.
I’m not sure what you mean? I’m guessing the friction along the walls of the column and sticky ness of the grease would come into play.phinds said:What factors have you identified that will have an effect on the answer?
So you figure the mass of it is irrelevant?Tritkoss said:I’m not sure what you mean? I’m guessing the friction along the walls of the column and sticky ness of the grease would come into play.
Yes I know it’s not a simple formula if you take into account all the possible variables, I was just looking for some help in the right direction. The column of grease is pushed on by fluid ranging in temp from 2degC to 25degC. It does not flow through but pushes up against a sensor that reads pressure. I am wondering how much pressure it would take to overcome the friction holding the grease stationary. It is most likely negligible but it would help me explain certain pressure readings to people I work for.phinds said:@Tritkoss we have touched on, but not completed, the list of things you will need to know. Do you begin to get the idea that it's not going to be a simple formula? It may well be that many of the possible factors are negligible, but you have to figure that out after you have a complete list.