Free convective condensation in a vertical enclosure

Free convective condensation in a vertical enclosure

Free convective condensation in a vertical enclosure was studied numerically and the results were compared with experiments. In both the numerical and experimental investigations, mist formation was observed to occur near the cooling wall, with significant droplet concentrations in the bulk. Large r...

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Bibliographic Details
Published in:Nuclear engineering and design Vol. 177; no. 1; pp. 71 - 89
Main Authors: Fox, R.J., Peterson, P.F., Corradini, M.L., Pernsteiner, A.P.
Format: Journal Article Conference Proceeding
Language:English
Published: Amsterdam Elsevier B.V 01-12-1997
Elsevier
Subjects:
Applied sciences
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heat exchangers (included heat transformers, condensers, cooling towers)
Condenser
Non condensable gas
Numerical simulation
Natural convection
Heat exchangers
Experimental study
Vertical tube
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Summary:Free convective condensation in a vertical enclosure was studied numerically and the results were compared with experiments. In both the numerical and experimental investigations, mist formation was observed to occur near the cooling wall, with significant droplet concentrations in the bulk. Large recirculation cells near the end of the condensing section were generated as the heavy noncondensing gas collecting near the cooling wall was accelerated downward. Near the top of the enclosure the recirculation cells became weaker and smaller than those below, ultimately disappearing near the top of the condenser. In the experiment the mist density was seen to be highest near the wall and at the bottom of the condensing section, whereas the numerical model predicted a much more uniform distribution. The model used to describe the formation of mist was based on a modified critical saturation model (MCSM), which allows mist to be generated once the vapor pressure exceeds a critical value. Equilibrium, nonequilibrium, and MCSM calculations were performed, showing the experimental results to lie somewhere in between the equilibrium and nonequilibrium predictions of the numerical model. A single adjustable constant (indicating the degree to which equilibrium is achieved) is used in the model in order to match the experimental results.
ISSN:0029-5493
1872-759X
DOI:10.1016/S0029-5493(97)00186-6