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Friday, 5 October 2018


We were discussing the concept of laminar and turbulent flowReynolds experimentfrictional loss in pipes, derivation of expression for loss of head due to friction in pipesco-efficient of friction in terms of shear stressbasics of shear stress in turbulent flow,  minor head losses in pipe flow, basic concept and working of syphon and also the  concept of hydraulic gradient and total energy line, in the subject of fluid mechanics, in our recent posts. 

Now we will go ahead to see the, flow through pipes in series and parallel, in the subject of fluid mechanics, with the help of this post. 

Flow through pipes in series 

When pipes of different lengths and different diameters are connected end to end to form a pipe line, such arrangement or connection of pipes will be considered as pipes in series or compound pipes. 

Important Point: Discharge passing through each pipe will be same. 

Following figure, displayed here, indicates the arrangement of connection of three pipes in series. 

Let us consider the following terms from above figure 

L1, L2 and L3: Length of pipes 1, 2 and 3 respectively 
d1, d2 and d3: Diameter of pipes 1, 2 and 3 respectively 
V1, V2 and V3: Velocity of flow through pipes 1, 2 and 3 respectively 
f1, f2 and f3: Co-efficient of friction for pipes 1, 2 and 3 respectively 
H = Difference of water level in two tanks 

We must note it here that difference in liquid surface level will be equal to the sum of total head loss in the pipes. 

If we neglect the minor head losses, we will have following equation for total head loss as mentioned here.

Let us consider that co-efficient of friction i.e. f is same for all three pipes and therefore we can write the equation for head loss as mentioned here. 

Further we will go ahead to find out the basic concept, Flow through pipes in parallel, in the subject of fluid mechanics, with the help of our next post. 

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


Fluid mechanics, By R. K. Bansal  
Image courtesy: Google   

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