関連ワード:  is mass flow rate constant    is mass flow rate constant in a pipe    is mass flow rate constant in a nozzle    is mass flow rate constant in steady state    is mass flow rate constant in a turbine    is mass flow rate constant in a compressor    is mass flow rate constant across a shock    is mass flow rate constant in compressible flow    when is mass flow rate not constant    is mass flow rate constant in incompressible flow