Pool boiling heat transfer enhancement of R134a, R32, and R600a using reentrant cavity surfaces. Issue 4 (7th June 2023)

• Record Type: Journal Article
• Authors: Shete, Umakant N.; Kumar, Ravi; Chandra, Ramesh
• Is Part Of: Experimental heat transfer. Volume 36:Issue 4(2023)
• Page Start: 528
• Page End: 547
• Publication Date: 2023-06-07
• Subjects: Heat transfer -- reentrant cavity -- R-134a -- R-32 -- R-600a; Heat -- Transmission -- Measurement -- Periodicals; 621.4022
• DOI: 10.1080/08916152.2022.2055226
• Languages: English
• ISSNs: 0891-6152

Abstract

ABSTRACT: The nucleated pool boiling heat transfer experiments for plain and five different reentrant cavity copper tube surfaces in saturated R134a, R32, and R600a have been carried out. The experiments are carried for heat fluxes ranging from 6.92 to 51.71 kW/m 2 at saturation temperatures of 7°C and 10°C. A significant increase in the boiling heat transfer coefficient has been observed for all tube surfaces with the reentrant cavity. The nucleate boiling heat transfer coefficient for R134a, R32, and R600a is 1.2–2.8 times more than that for plain tube surfaces. A correlation for reentrant cavity surfaces has also been developed.