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ANP QUARTERLY PROGRESS REPORT 0.2 0.1 0.02 ‘1 .AMINAR FLOW RP SOLID POINTS INDICATE CURRENT FLOW IN FLUID LENGTH (in.) 199 UNCLASSIFIED ORNL-LR-QWG 4453 2 5 I 04 2 5 {05 Re, REYNOLDS NUMBER Fig. 8.2. Friction Factors With and Without Electric Current Flow in Fluid. difference in pressure drop through the tubes under the two different conditions and that, hence, the hydrodynamic structure was not influenced by the electric currents for the laminar and turbulent ranges investigated. PH YSlCA L PR 0 PERT IES M EASU REM E NTS Heat Capacity W. D. Powers G. C. Blalock rimenta I Engineering Division and heat capacities of NaF-ZrF4- le %) were determined with the rimeter in the liquid and solid tes and with the copper-block calorimeter in he results are as follows: Solid (70 to 525OC): Bunsen calorimeter c = 0.18 5 0.01 P Liquid (550 to 9OOOC): Bunsen calorimeter H, - HOoC = 32 + 0.25t c = 0.25 k 0.02 P Liquid (570 to 885OC): copper-block calorimeter H, - HOoC = 19.5(0) + 0.265(6)t c = 0.265(6) t 0.002 P The enthalpies of this salt have also been determined by the National Bureau of Stendards, and a comparison is made in Table 8.1 of the results. The enthalpies and heat capacities of LiF-KF- UF, (48-48-4 mole 5%) were determined by the copper-block calorimeter in the solid and liquid states. Solid (125 to 465°C) H, - HOoC = 0.234t + 0.48 x t2 c = 0.234 + 0.95 x 0-4 t P Liquid (565 to 88OOC) H, - HOoC = -82.54 + 0.657t c = 0.657 - 3.93 x P - 1.97 10-4 t2 0-4 t . f x
PERIOD ENDING DECEMBER 10, 7954 TABLE 8.1. COMPARISON OF ENTHALPY DETERMINATIONS AT ORNL AND NBS FOR NaF-ZrF,-UF, (53-43-4 mole %) Temperature (OC) ORN L Enthalpy (cal/g) Bunsen Copper Block 6 00 182 178.9 178.9 700 2 07 205.4 205.3 800 900 232 257 In these expressions H is the enthalpy in cal/g, c is the heat capacity in cal/g."C, P temperature in OC. and t is the Viscosity S. I. Cohen T. N. Jones Reactor Experimental Engineering Division The program of viscometry technique refinement previously discussed5 is under way, and measurements have been made on one mixture. Studies will be made on others as samples become avail- able. A number of changes have been made in the viscosity apparatus. The length of the Brookfield spindle has been doubled, which allows the speed of rotation of the instrument to be halved without reducing the shear force. This reduction in speed assures the existence of laminar flow. Salts are contained in new tubes with a smaller diameter 232.0 258.5 NBS 231.1 256.0 handling of the instruments and improve atmos- pheric control. New calibrating liquids which have densities comparable to the densities of the fluorides are being used for both viscometers. Among these liquids are low-melting-point, easily handled, fused salt mixtures and heavy organic- ha I ogen compound s. Recent measurements made on NaF-ZrF,-UF, (53.5-40-6.5 mole %) are presented in Fig. 8.4. It may be noted that the average values obtained from the recent measurements are about 30% lower 6 than the preliminary values given previously. However, when the preliminary measurements were reported, only the more pessimistic, Brookfield values were given. It can also be seen from Fig. 8.4 that the agreement between the two instruments for the recent measurements is much better than for the earlier set of measurement:;. This result is due to improved fluoride preparcition and handling techniques, as well as to the refined viscometry methods. 6S. I. Cohen and T. N. Jones, Preliminary Measure- 5S. I. Cohen, ANP Quar. Prog. Rep. Sept. 10, 1954, ments of the Viscosity of Fluoride Mixture No. 44, ORNL-1771, P 127. ORNL CF-53-8-217 (Aug. 31, 1953).
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