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Author: Admin | 2025-04-28
Skin and outer surface of the dress. As a consequence of the mass transfer process and the ideal gas state equation, mzi would be expressed as follows. m z i = h m R w ⋅ T c l ( P a − P c l ) ⋅ A i = ( P c l − P s k ) R z i (20) R z i = R w ⋅ T s k h m ⋅ A i ⋅ ( P c l − P s k ) ( P a − P c l ) = R w ⋅ T s k h m ⋅ δ ε i ⋅ V ⋅ ( P c l − P s k ) ( P a − P c l ) (21) and because of Then, m s i = h m R w ⋅ T c l ( P a − P c l ) ⋅ ( V δ − A i ) (24) Imagine the human body as a cylindrical shape; the Re, Sc were calculated using Equations (25) and (26). S h = 0.26 Re 0.6 S c 0.38 ( S c ∞ S c c l ) 0.25 (26) where hm—Mass transfer coefficient, m/s; Tcl—Water vapor saturation temperature of a garment’s outer surface, K; Rw—Constant of water vapor gas, 461.89 J/(kg·K); Pcl—Water vapor pressure on the outer surface of the garment, Pa; Pa—Water vapor pressure in roadway air, Pa; Psk—Water vapor pressure on the surface of the skin, Pa; Ai—effective evaporation area, m2; Rzi—Moisture vapor resistance at i moment, Pa·s/kg; Rti—Evaporative resistance of clothing at i moment, kPa·m2/W; r—latent heat of vaporization, J/kg; d—the diameter of the bottom surface, 0.3 m; D0—Coefficient of diffusion, cm2/s; u-air velocity, m/s. 2.3. Model VerificationPrevious experiments have validated the modified PHS
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