10 Graph 2. Pressure loss The strength that Demi Star receives in the airflow as a uniform filling layer, that is, pressure loss, is obtained 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 an object in the airflow is required by the following equation. ⊿P ：Pressure Loss Pa CD ：Strength factor ρg ：Fluid density kg/m3 U ：Airflow speed m/s L ：Filling layer thickness m Df ：Line diameter ml ：Line length A per unit volume in the uniform filling layer ：Area ε in the direction of the airflow of Demi Star ：Spatial rate P CDGgU2L (1− 2 π Df ε−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
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