Abstract
ABSTRACT Molten salts are prospective candidates for core cooling of advanced high-temperature reactors. In the present work, a numerical investigation is performed to analyze the thermal-hydraulic performance of molten nitrate salt in a transversely grooved tube by varying geometrical parameters. The effect of geometric parameters on Nusselt number, friction factor, and thermal enhancement factor has been expressed in the form of dimensionless factors: groove height to tube diameter ratio (e/d) ranged from 0.038-0.092 and groove pitch to diameter ratio (P/d) ranged from 0.5-1.5, for Reynolds number ranged from 11,000 -30,000. Results show that the thermal performance of molten salt in a transversely grooved tube is dominated by geometrical parameters. In general, the Nusselt number and friction factor have been found to be increased with an increase in groove height and with a decrease in groove pitch. Reynolds number has a linear effect on the Nusselt number, while its influence on the friction factor is not significant. The highest value of the Nusselt number is achieved for the highest groove height (e/d = 0.092) and lowest groove pitch (P/d = 0.5) with corresponding maximum pressure drop. So, a tradeoff between heat transfer and pressure drop is achieved at e/d = 0.038 and P/d = 1.5 for Re = 11645 for the best overall thermal performance of molten salt in a transversely grooved tube.
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