Thermal-hydraulic characteristic of short-length self-rotating twisted tapes in a circular tube

Shaojie Zhang, Lin Lu, Qiuwang Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

This study investigated the thermal-hydraulic characteristic of a circular tube equipped with self-rotating twisted tapes (SRTTs) at different length ratios (LR = 0.3, 0.45, 0.6, and 1) when the Reynolds number is in the range of 12,000 to 45,000. The experimental outcomes revealed that full-length SRTTs can start rotating at a lower Reynolds number (Re = 18,700), and larger length ratios significantly increase the rotational speed. Moreover, the tube equipped with full-length SRTTs was found to provide a higher friction factor, thermal performance factor and Nussle number compared with those with shorter length ratios. The thermal performance factor was considerably increased from 0.91 to 0.95, 0.95 to 1.05, 1.04 to 1.08, and 1.09 to 1.27 owing to the operating condition of SRTTs switching from a stationary to a rotating condition. Finally, this study also derived associated correlations regarding the length ratio to predict the thermal performance in formulas of the Nussle number and friction factor.

Original languageEnglish
Article number105157
JournalInternational Communications in Heat and Mass Transfer
Volume122
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Length ratio
  • Short-length self-rotating twisted tapes
  • Thermal performance factor
  • Thermal-hydraulic characteristic

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Chemical Engineering(all)
  • Condensed Matter Physics

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