We were discussing the basic concept of kinetic energy correction factor and momentum correction factor, in the subject of fluid
mechanics, in our recent posts.
Now we will go ahead to find out the basic concept
of power absorbed in viscous flow and we will also see here the required power to
overcome the viscous resistance, in the subject of fluid mechanics, with the
help of this post.
Power absorbed in viscous flow
As we know that oil is used as lubricant for the
lubrication of machine parts. Now let us consider the case of oil lubricated
bearings as one example to understand this concept. Flow of oil in oil
lubricated bearing will be a good example of viscous flow.
Let us consider that we are using high viscosity
grade oil as lubricant for the lubrication of bearings. High viscosity grade
oil will offer higher resistance and hence more power will be lost.
If we will use oil of lower viscosity grade as the
lubricant for the lubrication of bearings, there will not be any possibility to
secure the desired oil film thickness between rotating components and
stationary metal surface. Therefore, there will be more wear and tear and service
life of bearings (in this case) will be reduced.
Therefore, it is very important to select the
correct viscosity grade oil as the lubricant for bearings.
We will now find out the power required to overcome
the viscous resistance in following conditions.
- Viscous resistance of journal bearings
- Viscous resistance of foot-step bearings
- Viscous resistance of collar bearings
Now we will go ahead to start a new topic in the
subject of fluid mechanics i.e. power requirement to overcome the viscous resistance of journal bearings.
Do you have any suggestions? Please write in comment
box.
Reference:
Fluid mechanics, By R. K. Bansal
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