We were discussing theÂ basic concept ofÂ kinetic energy correction factor and momentum correction factor,Â power absorbed in viscous flow, viscous resistance of journal bearings and viscous resistance of foot- step bearings in the subject of fluid mechanics, in our recent posts.Â

Now we will go ahead to find out the power required to overcome the viscous resistance of collar bearings, in the subject of fluid mechanics, with the help of this post.Â

### PowerÂ required overcoming the viscous resistance of collar bearings

A collar bearing is provided at any position along the shaft and bears the axial load on a mating surface. Surface of the collar may be plane normal to the shaft or of conical shape.Â

Following figure shows the collar bearing, where the face of the collar will be separated from bearing surface by an oil film of uniform thickness.Â

Let us consider the following data from above figure.Â
N = Speed of the shaft in rpmÂ
R1 = Internal radius of the collarÂ
R2 = External radius of the collarÂ
t = Thickness of the oil filmÂ

PowerÂ required overcoming the viscous resistance of collar bearings will be given by following formula as mentioned here.Â
Now we will go ahead to start a new topic in the subject of fluid mechanics i.e.Â Turbulent flow basics and difference between laminar flow and turbulent flow .Â

Do you have any suggestions? Please write in comment box.Â

### Reference:Â

Fluid mechanics, By R. K. BansalÂ Â