MadSci Network: Engineering

Re: Is water flow in a hose affected by the diameter of the hose fittings?

Date: Sun May 6 14:10:26 2001
Posted By: Sidney Chivers, , Nuclear Engineering, retired
Area of science: Engineering
ID: 988668149.Eg

Yes, but very probably the fittings inside your 1/2 inch hose had an inside 
diameter a little smaller than 1/2 inch.  The reduction in flow, due to the 
smaller dimensions of the fittings, is perhaps not as significant as you might 
first suspect, because the pressure you are able to get at the end of a long 
hose is also somewhat dependent upon the diameter of the hose.  The water does 
less work in travelling through a hose with a larger diameter, so that the 
pressure near the open end of the hose is more dependent upon the diameter of 
the hose than on the diameter of the fittings at the end.

References for this answer are any fluid dynamics textbook.  Some high school 
and most college physics textbooks will also include discussions of the more 
fundamental aspects of fluid flow through pipes.

Thanks for your question.


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