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. KEYWORDSCondensation; flow pattern structure; heat transfer rate; flow in horizontal pipe; flow behaviour; EES modelling Nomenclature A Tube cross-section area, [m 2 ] A l Liquid cross-section area, A l = A (1-ε), [m 2 ] A ld Dimensionless cross-sectional area occupied by liquid, A ld = A l /d 2 A V Vapor cross-sectional area, Av = A ε, [m 2 ] A vd Dimensionless cross-sectional area occupied by vapor, A vd = A v /d 2 c p Specific heat, [J/(kg.K)] D h Hydraulic diameter, [m] Fr l Liquid Froude number, G 2 /(q 2 l gD h ) g Acceleration of gravity, [m/s 2 ] G Total mass flow rate (mass velocity) of liquid and vapor [kg/(m 2 .s)] G strat Transition mass velocity of stratified flow [kg/(m 2 .s)] G wavy Transition mass velocity of wavy flow [kg/(m 2 .s)] h Heat transfer coefficient [W/(m 2 .K)]
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.