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Experimental Study of Salt Bead Dissolutions in Aqueous Solvents

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journal contribution
posted on 27.08.2014, 00:00 by Michael Shaltry, Supathorn Phongikaroon
Bead dissolutions of several chloride compoundslithium chloride-potassium chloride (LiCl-KCl) eutectic, lithium chloride (LiCl), strontium chloride (SrCl2), cerium chloride (CeCl3), lanthanum chloride (LaCl3), praseodymium chloride (PrCl3), and yttrium chloride (YCl3)were performed in water at 20 °C. Additional bead dissolutions involved LiCl-KCl beads in two types of brine solvents. Each bead diameter was measured and found to change linearly with time in water. A model regression to these measured data resulted with R2 > 0.942. Results indicated dissolution was faster in water than in the brines. Calculated mass transfer coefficients were in the range of 1.00 × 10–2 mm s−1 to 2.67 × 10–2 mm s−1. Based on a Sherwood correlation, Sh = 2 + 0.0254Gr0.333Sc0.577, calculated diffusion coefficients were in the range of 10–5 mm2 s−1 to 10–3 mm2 s−1. Results implied mass transfer of the eutectic was dominated by diffusion, whereas a transition from natural convection to diffusion was inferred for the other solutes.