Abstract
In this study, we examined the condensing behavior of single and multiple bubbles of pure steam in a subcooled liquid phase using a fully compressible two-phase homogeneous mixture method that is solved by an implicit dual-time preconditioned technique. The interface between the liquid and vapor phases was determined by the advection equations using a compressive high-resolution interfacing capturing method. The spurious current reduced near the interface, a smoothing filter is applied to the progress curvature calculation. The sensitivity study carried out to predict the empirical constant by using Lee’s mass transfer model. A comparison of the numerical and experimental results highlighted that the proposed model accurately predicted the behavior of the definite condensing bubble. Furthermore, the single and multiple bubble condensation behaviors were investigated for different initial subcooled temperatures, and bubble diameters under various gradient flow, such as velocity gradient, temperature gradient, and velocity and temperature gradients. Subsequently, the effect of multiple bubbles flows in different bubble pattern forms, and their condensation was studied. The coalescence of bubbles depends on the subcooled temperature. Furthermore, the bubble diameter, the gap between the bubbles, and the flow rate of the bubbles were also observed.
Highlights
Heat transfer characteristics in bubble dynamics are essential phenomena in the design of nuclear reactors, boilers, and cooling system in electronic devices
Heat transfer characteristics are highly pronounced under subcooled boiling flow conditions, and the knowledge of bubble dynamics is crucial during the design of several industrial applications
This research is focused on theoretical study, experimental analysis, and numerical simulation of the application, as mentioned above
Summary
Heat transfer characteristics in bubble dynamics are essential phenomena in the design of nuclear reactors, boilers, and cooling system in electronic devices. This research is focused on theoretical study, experimental analysis, and numerical simulation of the application, as mentioned above (bubble condensation in subcooled flow boiling). The simulation performed [22] focused on bubble behaviors under low- and high-pressure, different bubble sizes, and different subcooled temperatures; and compared different velocities and bubble lives for a single bubble. Considering the perspectives mentioned above, the numerical simulation in this study focused on single- and multi-bubble condensation flow under velocity and temperature gradients. For simulating the gradient flow condensation, we used to apply different operating conditions, such as different bubble diameters, subcooled temperatures, velocities, and different multi-bubble pattern arrangements. S Paramanantham et al [22] extended the same computation method for bubble condensation using a vertical channel that was simulated This prediction was successfully validated using the experimental data. Phan et al [36] analyzed the air-steam mixture condensation flows in a vertical tube with different air–steam mixture flow conditions
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