Impact of blockage ratio on thermal performance of delta-winglet vortex generators

Indri Yaningsih, Agung Tri Wijayanta, Takahiko Miyazaki, Shigeru Koyama

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The impact of double-sided delta-winglet tape (DWTs) inserts on convective heat transfer and friction behaviors in a tube was experimentally investigated. Three DWTs with ratios of winglet-height (b) to inner tube diameter (d i ) called blockage ratio (R b ) of 0.28, 0.35 and 0.42 were tested and their performance was compared to that of a longitudinal strip and plain tube under similar test flow conditions. Experiments were conducted over a wide range of flow rates, 3.35 × 10 -5 -8.33 × 10 -5 m 3 /s, which correspond to 5500 ≥ Reynolds number (Re) ≥ 14,500 in the 14.3 mm i.d. tube. The results revealed that using DWTs dramatically increased the Nusselt number (Nu) by as much as 364.3% and the friction factor (f) by 15.5 times compared with those of a plain tube. Thermal performance (η) increased with a corresponding increase in R b . The highest thermal performance (η) obtained was 1.4. Showing a notable improvement on the thermal performance of the system, DWTs are proposed as a favorable insert device.

Original languageEnglish
Article number181
JournalApplied Sciences (Switzerland)
Volume8
Issue number2
DOIs
Publication statusPublished - Jan 26 2018

Fingerprint

winglets
vortex generators
Tapes
Vortex flow
tapes
tubes
Die casting inserts
inserts
plains
Friction
Nusselt number
friction factor
convective heat transfer
Reynolds number
Flow rate
Heat transfer
strip
friction
flow velocity
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

Cite this

Impact of blockage ratio on thermal performance of delta-winglet vortex generators. / Yaningsih, Indri; Wijayanta, Agung Tri; Miyazaki, Takahiko; Koyama, Shigeru.

In: Applied Sciences (Switzerland), Vol. 8, No. 2, 181, 26.01.2018.

Research output: Contribution to journalArticle

Yaningsih, Indri ; Wijayanta, Agung Tri ; Miyazaki, Takahiko ; Koyama, Shigeru. / Impact of blockage ratio on thermal performance of delta-winglet vortex generators. In: Applied Sciences (Switzerland). 2018 ; Vol. 8, No. 2.
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