Why does water flow faster through a hose if its choked?

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SUMMARY

The discussion centers on the phenomenon of fluid dynamics in hoses, specifically how choking a hose can increase the flow rate of antifreeze into a car's cooling system. Participants noted that choking the hose reduces back-pressure and agitates the fluid, facilitating faster flow. The concept aligns with the bottle-neck effect, where constricting a flow path can enhance throughput under certain conditions. Empirical observations indicated that creating a gap between the hose ends maximizes flow efficiency.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with the concept of back-pressure in fluid systems
  • Knowledge of the bottle-neck effect in flow mechanics
  • Basic experience with automotive cooling systems
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  • Research the principles of fluid dynamics in automotive applications
  • Explore the effects of back-pressure on fluid flow in hoses
  • Learn about the bottle-neck effect and its implications in engineering
  • Investigate techniques for optimizing flow in automotive cooling systems
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Automotive engineers, fluid dynamics enthusiasts, and anyone involved in optimizing cooling systems in vehicles will benefit from this discussion.

Niaboc67
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A thought came to me while pouring antifreeze into my car today. As I pour in the anti-freeze it fills to the brim and takes awhile to flow through the cooling-system. However, if I choke the hose a few times it for some reason swallows the antifreeze faster. Is this similar to the bottle-neck effect? allowing a shorter number of x to flow through y?

Thanks
 
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Choking can mitigate the back-pressure and agitate the fluid (does tapping the tube also work?) but it may just be subjective because you are doing something instead of waiting. Did you try measuring the flow rate (including the time to choke the tube a few times) for each case?
 
Thanks for the rely!
I've done this numerous times and it always takes awhile for the antifreeze to flow. Tapping does not allow it to flow as easily, although slightly. Choking it to the point where end A and end B are separated seems to work the best. The more the gap between end A and end B, or the midpoint between the hose the radiator and cooling system are closed the more easily the flow afterwards.
 

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