In discharge is measured and be calculated, the physical property that should use a few fluids (fluid content sex) , they measure what the accuracy of the quantity reachs flowmeter to choose to discharge have very big effect. Be confined to this book length, we make basic idea and the introduction of a few simple calculation type only to these content sex parameter, detailed data data needs to inquire about manual.
1. The density of the fluid
The density of the fluid is defined by next type
In type: ρ -- fluid density, kg/m3;
M -- the quality of the fluid, kg;
V -- the bulk of the fluid, M3.
(1) liquid density
When pressure is constant, liquid densimeter calculates type to be:
ρ = ρ20[1- μ (T-20) ] (4.10-6)
In type: ρ -- density of the liquid when temperature T, kg/m3;
ρ20-- density of the liquid when 20 ℃ , kg/m3;
μ -- liquid bulk coefficient of expansion, 1/ ℃ ;
T -- liquid temperature, ℃ .
When temperature is constant, liquid densimeter calculates type to be:
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