10 Graph 2. Pressure loss The anti force that a Demi star in the air current receives in the unit area as a uniform filling layer, that is, pressure loss is determined by the following equation. When the fluid viscosity is μg, the anti-force factor CD has a function relationship with the Reynolds number NRe, and in general, approximate values are obtained by the following equations. CD＝８.４NRe -0.32…………………Equation (2.3) However, μg: Fluid viscosity Pa s This is due to the following equation that the anti force D received by an object in the airflow direction per projected area in the airflow direction. ⊿P ：Pressure loss Pa CD ：Anti force coefficient ρg ：Fluid density kg/m3 U ：Airflow velocity m/s L ：Thickness of the filling layer m Df ：Line length ml ：Line length A per unit volume in the uniform filling layer ：Area ε in the airflow direction of Demi star ：Spatial rate P = ρgU2L (1-222222D D (2.1) type ((2.1 D = CD ρgU2 2LD = 2LD = 1- εDf 2) πDf − − − − − − − − − − − − − space ratio P = − − − − − − − − − − − − − − − − − − − − − − − space ratio P= − − − − − − − − − − − − − − − − space ratio P = − − − − − − − − −
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