首页|Assessment of critical heat flux (CHF) on irradiated and non-irradiated nano-composite surfaces
Assessment of critical heat flux (CHF) on irradiated and non-irradiated nano-composite surfaces
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NETL
NSTL
Elsevier
This study employs an electrophoretic deposition (EPD) technique to fabricate a uniform nano-composite thin film coating on boiling thin steel plates. Two primary methodologies for creating composite nano coatings are explored: the simultaneous method and the sequential method, each comprising three distinct modes. To assess the impact of gamma irradiation on critical heat flux (CHF), test specimens were irradiated in a gamma cell at doses ranging from 100 to 300 kGy, followed by scanning electron microscopy (SEM) and Brunauer-EmmettTeller (BET) analysis. Contact angle and capillary length measurements were conducted for each coated specimen. Subsequently, the specimens underwent testing in a boiling pool to determine CHF and boiling heat transfer coefficients. The results indicate that both nano-composite coating and gamma irradiation significantly reduce the maximum pore diameter while enhancing porosity, pore surface area, and pore volume. Among the coating techniques, the sequential method with a double ratio of the outer to inner layer demonstrated superior performance in CHF enhancement. Notably, the CHF of the irradiated TiO2-ZrO2 nano-composite coated plate at 300 kGy increased from 1646 to 2258 kW/m2, representing a 37 % improvement. This enhancement in CHF is attributed to increased capillary effects resulting from the structural modifications induced by the coating and irradiation processes.
NETL
NSTL
Elsevier
