Enhancement of Downward-Facing Saturated Boiling Heat Transfer by the Cold Spray Technique

Nuclear Engineering and Technology

John K. Potter¹  Timothy J. Eden¹  Albert E. Segall²  Faruk A. Sohag³  Faith R. Beck³  Fan-Bill Cheung³  Lokanath Mohanta³ 

[1] Applied Research Laboratory, Pennsylvania State University, University Park, PA 16802, USA;Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA;Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USA;

关键词: Cold Spray;    Critical Heat Flux Limit;    Downward-Facing Boiling;    In-vessel Retention;    Microporous Coating;   

DOI  :  10.1016/j.net.2016.08.005

来源: DOAJ

【 摘 要 】

In-vessel retention by passive external reactor vessel cooling under severe accident conditions is a viable approach for retention of radioactive core melt within the reactor vessel. In this study, a new and versatile coating technique known as “cold spray” that can readily be applied to operating and advanced reactors was developed to form a microporous coating on the outer surface of a simulated reactor lower head. Quenching experiments were performed under simulated in-vessel retention by passive external reactor vessel cooling conditions using test vessels with and without cold spray coatings. Quantitative measurements show that for all angular locations on the vessel outer surface, the local critical heat flux (CHF) values for the coated vessel were consistently higher than the corresponding CHF values for the bare vessel. However, it was also observed for both coated and uncoated surfaces that the local rate of boiling and local CHF limit vary appreciably along the outer surface of the test vessel. Nonetheless, results of this intriguing study clearly show that the use of cold spray coatings could enhance the local CHF limit for downward-facing boiling by > 88%.

【 授权许可】

Unknown