Volume throughput leakage

Colloquial statement of tightness Volume throughput leakage (mbarls h Mass flow leakage (kgh ) Explanations... 

However often the leakage rate is defined as volume throughput in a period of time with the unit mbar 1 s (corresponds to cm s at 1 bar). 

Obviously the leakage rate Qpv depends on the temperature and molar mass of the leaking gas. Therefore in a statement of a leakage rate in volume throughput units the gas species, for example air or nitrogen and a reference temperature, for example 23 C must be stated additionally. 

Here N is the rotation rate of the screws, m is the number of thread starts per screw, and V is the volume of a single chamber. In reality the output of a twin-screw extruder is, of course, smaller than the theoretical throughput because the chambers are not completely closed. Four different kinds of leakage flows can be distinguished (4) (see Fig. 2.8) ... 

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