Hideout and return of complex mixtures in crevices

Technical Report · Sun Sep 01 04:00:00 EDT 1991

OSTI ID:5192234

Balakrishnan, P V ^[1]

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1. Atomic Energy of Canada Ltd., Chalk River, ON (Canada)

Hideout of mixtures of sodium chloride, sodium sulfate and calcium chloride were studied in crevices packed with carbon fiber or carbon powder packing, at a superheat of 90{degree}F and heat fluxes varying from 27,280 to 86,282 Btu/ft{sup 2}.h (86 to 272 kW/m{sup 2}). Solute was found to accumulate at a linear rate unit the crevice approached saturation capacity. The hideout rate depended primarily on the heat flux and was given by the product of the concentration in the bulk water, the evaporation rate in the crevice and an efficiency factor. The efficiency for the fibre-packed crevice was very nearly 100%, while that for the powder-packed crevice was in the range 60 to 80%. No preferential hideout of one species over another was observed. Chemistry calculations using the code MULTEQ indicated that Na{sub 2}SO{sub 4}, CaSO{sub 4} and NaCl were present in the crevice as solid and that the boiling point elevation of the solution in the crevice was about 45{degree}F (25{degree}C). The solute species were released when the heat flux in the crevice was turned off. The pH of the effluent went through a maximum value higher than that of the feed solution during the return phase; the crevice pH was probably high during the hideout phase and low during the return phase. The hideout process is examined in the light of an adaptation of the existing models. The hideout return is shown to be diffusion-controlled. 11 refs., 14 figs., 6 tabs.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); Atomic Energy of Canada Ltd., Chalk River, ON (Canada)
• Sponsoring Organization: EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 5192234
• Report Number(s): EPRI-NP-7494
• Country of Publication: United States
• Language: English

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