Modeling of Heat Transfer and Steam Condensation Inside a Horizontal Flattened Tube  

作　　者：M.Gh.Mohammed Kamil M.S.Kassim R.A.Mahmood L.AZ Mahdi 

机构地区：[1]Mechanical Engineering Department,Faculty of Engineering,Mustansiriyah University,Baghdad,10052,Iraq [2]School of Mechanical and Electrical Engineering,University of Southern Queensland,Queensland,4350,Australia [3]Engineering Collage,University of Zakho,Zakho,42002,Iraq [4]Energy and Renewable Energies Technology Center,University of Technology,Baghdad,10066,Iraq

出　　处：《Fluid Dynamics & Materials Processing》2022年第4期985-998,共14页流体力学与材料加工（英文）

摘　　要：This work investigates the steam condensation phenomena in an air-cooled condenser.The considered horizontal flattened tube has a 30 mm hydraulic diameter,and its length is a function of the steam quality with a limit value between 0.95 and 0.05.The mass flow rate ranges from 4 to 40 kg/m^(2).s with a saturated temperature spanning an interval from 40°C to 80°C.A special approach has been implemented using the Engineering Equation Solver(EES)to solve a series of equations for the two-phase flow pattern and the related heat transfer coefficients.A wavy-stratified structure of the two-phase flow has been found when the mass rate was between 4 and 24 kg/m^(2).s.In contrast,an initially annular flow is gradually converted into a wavy stratified flow(due to the condensation process taking place inside the flattened tube)when the considered range ranges from 32 to 40 kg/m^(2).s.

关 键 词：CONDENSATION flow pattern structure heat transfer rate flow in horizontal pipe flow behaviour EES modelling 

分 类 号：O35[理学—流体力学]