Forecast Study on the Overall Coefficient for Passage of Single-Phase and Passage of Single-Phase in an Annular to Plain Tubes Heat Stream

• Published in: IOP conference series. Earth and environmental science Vol. 1223; no. 1; pp. 12028 - 12034
• Main Authors: Alsulaiei, Zaher Mohammed Abed, Abid, Haider Jabaur, Shakir, R., Ajimi, Hawra Salah Hamid
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.08.2023
• Subjects: Circular tubes; Convection; Convective heat transfer; Fluid flow; Forced convection; Heat flux; Heat transfer; Heat transfer coefficients; Overall coefficient of heat transfer; Reynolds number; Single-phase on annular passage; Single-phase on single-phase passage; Turbulent flow; Turbulent zone
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/1223/1/012028

Abstract To prevent buoyancy effects from increasing the overall heat transfer coefficient due to low heat flux, smooth vertical circular tubes require forced convection conjectures. Previous research has focused on mixed convection in turbulent regions and has limited studies on forced convective heat transfer. This study aims to investigate the predictable overall coefficients of heat transfer performance under specific conditions of forced convection, considering both vertical up flow and down flow through the smooth circular test section. The recommended Reynolds numbers for water are (7201.6–14577.4) and (3186.7–6396.75) for single-phase and single-phase annular passages, respectively, with a heat application range of (50–500 W). The overall coefficient of heat transfer is (333.91 - 432.95 W/m2.K) and (169.76 - 251.20 W/m2.K) for single-phase and single-phase annular passages, respectively. The flow was turbulent for all heat fluxes.