Different forms of mass flow rate balance One dimensional flow form assumption: The flow is normal to the boundary at inlet and outlet locations. All intensive properties,including velocity and density,are uniform with position over each inlet or exit area. 1 D flow: Area=A area,m2、 velocity,m/s Air V.T.v m=pAV or Air compressor density,kg/m3 Air mass flow rate, volumetric flow rate, kg/s m3/s -Ay-Σ dt 上游充通大学 Mar/15,Wed,2017 6 SHANGHAI JLAO TONG UNIVERSITYMar/15, Wed, 2017 6 Different forms of mass flow rate balance One dimensional flow form assumption: • The flow is normal to the boundary at inlet and outlet locations. • All intensive properties, including velocity and density, are uniform with position over each inlet or exit area. 1D flow: or velocity, m/s area, m2 density, kg/m3 mass flow rate, kg/s volumetric flow rate, m3/s