Abstract
Iron–Chromium–Aluminum(FeCrAl), recognized as one of the most promising materials for accident-tolerant fuel (ATF), bears substantial commercial potential owing to its advantageous attributes. To gain a deeper insight into the subcooled boiling properties of FeCrAl, a series of boiling experiments were conducted on FeCrAl material surface for the evaluation of bubble characterization, bubble population and heat transfer characteristics. The experiments were conducted at atmospheric pressure with a subcooling of 0–12 K, a wall superheat of 0–30, and the maximum Reynolds number of the coolant was 10400. The results revealed a greater sensitivity of heat transfer to fluid velocity during nucleate boiling for surfaces with lower porosity compared to higher porosity surfaces. Analysis of the bubble dynamics showed that the Sauter mean diameter increases with increasing wall superheat, following a relationship dependent on the maximum and minimum bubble diameters. Furthermore, bubble size and aspect ratio adhered to lognormal distributions, bubble orientation followed normal distributions, and bubble circularity obeyed Weibull distributions.
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