Discharge Coefficient
Discharge Coefficient
(OP)
I am searching for a method of calculating different discharge coefficients for different nozzle geometries. I thought I have found the connection, but it seemed my assumptions were wrong.
The problem; we have calculated the pressure drop in a "nozzle" for a given flow and liquid using bernoulli with discharge coefficient and geometry factor. The nozzle has three openings, giving a correction factor (on hydraulic diameter) which is the same for ALL tests we have performed. However, with the same application the number of openings were increased to 6 trying to increase the hydraulic diameter, which it did. But the connection to "my factor" were lost. Of course the geometry were changed...
Does it exist an overview of different Cd with different geometry?
The problem; we have calculated the pressure drop in a "nozzle" for a given flow and liquid using bernoulli with discharge coefficient and geometry factor. The nozzle has three openings, giving a correction factor (on hydraulic diameter) which is the same for ALL tests we have performed. However, with the same application the number of openings were increased to 6 trying to increase the hydraulic diameter, which it did. But the connection to "my factor" were lost. Of course the geometry were changed...
Does it exist an overview of different Cd with different geometry?





RE: Discharge Coefficient
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Discharge Coefficient
Thank's anyway...;)
RE: Discharge Coefficient
sometimes you can make engineering judgements about the flow balance between nozzles and still arrive at a reasonable estimate. if not then you have flow testing and cfd
RE: Discharge Coefficient
But a quite extreme effect on more holes with the same cross section area (flow area), exponentially larger without having seen all data yet.
Interesting...