Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape

Simple item page
dc.contributor.authorWongcharee, K.
dc.contributor.authorChuwattanakul, V.
dc.contributor.authorChamoli, S.
dc.contributor.authorMaruyama, N.
dc.contributor.authorHirota, M.
dc.contributor.authorEiamsa-ard, S.
dc.date.accessioned2026-08-06T10:50:36Z
dc.date.available2026-08-06T10:50:36Z
dc.date.issued2025-03-01
dc.description.abstractThis study examines the influences of U-cut twisted tapes (U-TTs) on thermal-hydraulic behaviors in a circular tube with uniform heat flux. The geometric parameters studied include six U-cut ratios (s/t = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0) and two twist ratios (y/w = 3.5 and 4.0). Experimental results revealed that their U-cut ratios highly influenced heat transfer enhancement. U-TTs with U-cut ratios (s/t) of 0.5, 1.0, 1.5, and 2.0 achieved higher Nusselt numbers than conventional twisted tapes (TTs). In contrast, U-TTs with larger U-cut ratios (s/t = 2.5 and 3.0) showed reduced Nusselt numbers. However, friction losses with all U-TTs were consistently higher than those with TTs. Due to their excellent heat transfer enhancement, U-TTs with s/t ratios of 0.5 and 1.0 exhibited significantly higher thermal performance factors (TPF) than conventional TTs. The highest TPF, 1.28, was achieved by U-TTs with an s/t ratio of 0.5 and a y/w of 3.5 at a Reynolds number of 6000.
dc.identifier.citationCase Studies in Thermal Engineering, 67, 2025
dc.identifier.doi10.1016/j.csite.2025.105838
dc.identifier.issn2214157X
dc.identifier.other2-s2.0-85217035472
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/16834
dc.sourceCase Studies in Thermal Engineering
dc.subjectHeat transfer performance
dc.subjectSwirling flow
dc.subjectThermal performance
dc.subjectTurbulence
dc.subjectTwisted tape
dc.subjectU-cut twisted tape
dc.titleInvestigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape
dc.typeArticle

Files

Collections

Research