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Abstract
Enhancement of quenching heat transfer at film boing regime is one of the primary concerns in handling decay heat produced by downward-faced core catcher units in the nuclear industry. The present study focused on the enhancement of the quenching rate of a hemispherical downward-facing copper sample by the modification of the substrate surface using electrical discharge machining (EDM) texturing and the addition of trisodium phosphate (TSP) to the coolant. All quenching tests were carried out at 500 °C under atmospheric pressure. The influence of surface texturing and fluid additives on quenching rate and bubble dynamics has been investigated using cooling curves and visualization studies. The EDM textured boiling surface showed an improved cooling performance by the significant reduction in the quenching time compared to the bare surface. TSP added with deionized (DI) water showed an enhancement in the quenching rate compared to DI water. EDM surface with TSP exhibits better cooling performance compared to bare surface and DI water by yielding 75% enhancement in the overall cooling rate. Visualization studies were conducted to investigate the bubble dynamics during the quenching phenomenon under the influence of EDM textured surface and TSP.
Acknowledgement
The authors are grateful for the support of the lab staff of National institute of technology.
Disclosure statement
The authors declared that there is no conflict of interest
Additional information
Notes on contributors
Athikkal Rakesh
Athikkal Rakesh is currently pursuing Ph.D. in the Department of Mechanical Engineering at National Institute of Technology Calicut. His research domain includes passive heat transfer enhancement and boiling heat transfer analysis.
Arivalagan Inbaoli
Arivalagan Inbaoli is currently pursuing Ph.D. in the Department of Mechanical Engineering at National Institute of Technology Calicut. His research domain includes passive heat transfer enhancement and boiling heat transfer analysis.
Charuvezhathu Sivaraman Sujith Kumar
Charuvezhathu Sivaraman Sujith Kumar is an Assistant Professor in the Department of Mechanical Engineering at National Institute of Technology Calicut. He received his Ph.D. from National Institute of Technology Trichy and did his Post. doc in National Taiwan University. His research interests are pool and flow boiling, surface modification, solar interfacial evaporation, and condensation.
Basil Kuriachen
Basil Kuriachen is an Assistant Professor in the Department of Mechanical Engineering, National Institute of Technology Calicut since 2020. He received Ph.D. and M. Tech degrees from NIT Calicut (2015) and Mahatma Gandhi University, Kottayam (2011), respectively. His research interests are in the field of metal additive manufacturing, micro/nano-machining processes, advanced machining processes, friction stir welding & processing, and surface characterization.