Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 134, Issue -, Pages 355-362Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2018.08.025
Keywords
Heat transfer enhancement; Louvered strip insert; Slant angle; Nusselt number; Friction factor; Thermal performance
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Funding
- Institute for Research and Community Services, Universitas Sebelas Maret (UNS), Surakarta, Indonesia
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Effect of slant angle (alpha) of louvered strip insert on single-phase forced convection heat transfer and friction factor of internal flow was investigated experimentally. The parameter of slant angles (alpha) 15 degrees, 20 degrees and 25 degrees was examined at the Reynolds number (Re) of 5300-17,500. The plain tube was also performed for comparison. The results show that the louvered strip insert provided the increases in heat transfer and friction factor up to 77.02% and 3.35 times above the plain tube. The results also indicate that heat transfer and friction factor increased with increasing slant angle. The highest slant angle yielded the highest thermal performance factor in the value of 1.12. Empirical correlations were also developed for Nusselt number and friction factor based on experimental data.
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