TY - JOUR ID - TI - Experimental and analytical investigation of pressure Drop and void fration for vertical downward Two - phase (Annular) flow in large diameter pipe دراسة تحليلية وعملية لتغير الضغط ونسبة الفراغ لجريان العمود النازل ثنائي الطور لأنبوب كبير القطر AU - حميد بلاسم ماهود AU - علي زكي مهدي السوداني AU - عطارد مطر عوفي PY - 2011 VL - IS - 6 SP - 388 EP - 406 JO - Journal of College of Education مجلة كلية التربية SN - 18130380 AB - An experimental and an analytical in co-current downwardtwo-phase (Annular) flow was preformed . The results ofobservation of flow rates , void fraction and pressure drop inannular flow pattren were presented. Air-water mixture were usedin transport test-section of 7.35 cm I.D. and 3.25 m length withoperation condition of 36-42 Cº temperature and 129 Kpa and 143Kpa pressure .Void fraction was measured locally by using a newmethod which is Auto-transformer technique .The experimental results of pressure drop was compared very well with analyticalresults presented .

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