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Flow rate and available head relation

 
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Jun29-12, 10:40 AM   #1
 

Flow rate and available head relation


It is stated that as volumetric flow rate increses the available head decreases. Can anybody explain this sentence?
 
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Jun29-12, 11:09 AM   #2
 
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The statement has to be put into context, but generally it means that there is an irreversible pressure drop through piping or other conduit which increases as flow rate increases.
 
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