Flow rates for nozzles

Greg Hermann bearbvd at sni.net
Fri Dec 18 02:49:15 GMT 1998


>>
>>So, I need to know how to calculate flow for currently available
>>conventional nozzles

A pretty close approximation  is that an injector which would flow 30
lbs./hour of (typical) gasoline at a given delta p will flow 34.9 lbs./hour
of water at the same delta p. This same ratio would apply pretty much
regardless of flow units or injector size when going from gasoline flow to
water flow.  Different story if a particular is actually rated in terms of
mass flow of alky (and ethanol different from methanol).

Ignoring viscosity considerations, relationship is as follows: Mass flow
rate 2 = Mass flow rate 1 times square root of ( density 2 divided by
density 1). {At any given constant delta pressure, and assuming a
non-compressible fluid.} (Density of water is 8.33 lbs./gallon; Density of
typical gasoline blend is 6.16 lbs./gallon; Density of methanol is 6.60
lbs./gallon; Density of ethanol is 6.54 lbs./gallon.) (All figured using
U.S., 230.4 cubic inch gallons.)

Regards, Greg





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