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TECHNICAL PAPERS: Natural and Mixed Convection

A Natural Convection Model for the Rate of Salt Deposition From Near-Supercritical, Aqueous Solutions

[+] Author and Article Information
Marc Hodes

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

Kenneth A. Smith

Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 66-540, Cambridge, MA 02139

Peter Griffith

Department of Mechanical Engineering, 77 Massachusetts Avenue, Room 7-044, Cambridge, MA 02139

J. Heat Transfer 125(6), 1027-1037 (Nov 19, 2003) (11 pages) doi:10.1115/1.1603772 History: Received June 10, 2002; Revised June 03, 2003; Online November 19, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic of the test section used in the Hodes et al. deposition experiments 12 modeled here
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Photograph of the 5.08 mm (outer) diameter heated cylinder before insertion into the cross flow of a 4 wt% aqueous sodium sulfate solution and upstream, downstream and side views of it after about 15 minutes of exposure. (Flow direction and gravity vector are shown in side view.) [Tb=356°C,P=250 bar,ṁsoln=10.47 g/min.]
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Temperatures, concentrations and principles relevant to the deposition rate calculations plotted on a generic solubility diagram representative of the sodium sulfate-water and potassium sulfate-water systems at a pressure of 250 bar
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Moving differential control volume used to derive the mass and energy balances at the SLSI
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Measured 1 and predicted mass of salt deposited versus time when the sodium sulfate concentration in the inlet stream is 4 wt%. Includes sensitivity analysis on Hdiss and DAB
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Predicted mass of salt deposited on the heated cylinder versus time when the concentration of sodium sulfate in the inlet stream was 4 wt% extended to steady-state conditions. Includes sensitivity analysis on Hdiss and DAB.
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Measured 1 and predicted mass of salt deposited versus time when the concentration of sodium sulfate in the inlet stream was 4 wt%. Includes sensitivity analysis on TB*, and ϕ.
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Predicted mass of salt deposited on the heated cylinder versus time when the concentration of sodium sulfate in the inlet stream was 4 wt% extended to steady-state conditions. Includes sensitivity analysis on TB*, and ϕ.
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Experimental data and predictions for all of the sodium sulfate deposition experiments. (One curve represents the results for the 2 and 4 wt% inlet concentrations as the results are indistinguishable and the same “envelope boundary” pragmatically bounds the predictions for all the experiments.)
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Experimental data and baseline predictions for the potassium sulfate deposition experiments
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Idealized boundaries between regions containing various combinations of solid salt, pure water and aqueous salt solution surrounding the heated cylinder
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Driving forces for deposition at the SLSI and in the PSL

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