冷媒HCFC22,HFC134a,HCFC123の水平平滑管内凝縮 : 第1報,局所摩擦圧力降下に関する実験式の提案

概要

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An experimental study of condensation of refrigerants HCFC 22, HFC 134a and HCFC 123 inside a horizontal smooth tube is presented. The test condenser is a double-tube counter-flow type, where the refrigerant flows inside the inner tube and the cooling water flows counter-currently in the outer annulus. The inner tube made of copper is of 6.0 m length and 8.4 mm inner diameter. The measured values for the frictional pressure drop are correlated as Φ_v=1+0.5[G/√<gdρ_v(ρ_L-ρ_V)]>^<0.75>X_<tt>^<0.35>, where Φ_V and X_<tt> are Lockhart-Martinelli parameters, G is the total mass velocity, g is the gravitational acceleration, d is the inner diameter, and ρ_V and ρ_L are the densities of vapor and liquid, respectively. The static pressure drop calculated using this correlation equation agrees with the measured values within the error of 0〜-5%.
社団法人日本機械学会の論文
1994-06-25