10 Graph 2. Pressure loss The force that Demi Star receives in the unit area as a uniform filling layer, i.e. pressure loss, is calculated by the following equation. The force coefficient CD has a function relationship with the Reynolds number NRe when the fluid viscosity is μg, and in general, the approximate value is obtained by the following equations. CD＝８.４NRe -0.32…………………Equation (2.3) However, μg: Fluid viscosity Pa・s This is because the force D received by the object in the airflow is calculated by the following equation. ⊿P ：Pressure Loss Pa CD ：Strength coefficient ρg ：Fluid density kg/m3 U ：Air flow velocity m/s L ：The thickness of the filling layer m Df ：Line column diameter ml ：Line length A per unit volume in uniform filling layer ：Area ε in the direction of the airflow of Demi Star ：Spatial rate P = 1- 2π Df equation (2.1) D = 2.2 ρgU2 2 1A = 1-πDf 2) Df −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
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