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May 14, 2014Case Studies in Thermal EngineeringOpen Access

A case study on thermal performance assessment of a heat exchanger tube equipped with regularly-spaced twisted tapes as swirl generators

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Authors

PEP. Eiamsa-ardRajabhat Rajanagarindra UniversityNPN. PiriyarungrojMahanakorn University of TechnologyCTChinaruk ThianpongKing Mongkut's Institute of Technology Ladkrabang

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Implication

Experimental and numerical study reveals thermal and friction tradeoffs in heat exchanger tubes equipped with regularly spaced twisted tapes, highlighting geometry-dependent efficiency gains.

Key Points

  • To assess how regularly-spaced twisted tape inserts influence heat transfer, friction factor, and overall thermal performance compared to full-length twisted tapes in heat exchanger tubes.
  • Tested full-length twisted tapes (twist ratios y = 6.0 and 8.0) and regularly-spaced twisted tapes across two twist ratios and three space ratios (s = 1.0, 2.0, and 3.0).
  • Modeled turbulent decaying swirling flow and heat transfer characteristics by solving the Navier–Stokes and energy equations using the SIMPLE algorithm with the RNG k–ε turbulence model.
  • Heat transfer rate and friction factor increased as the tape twist ratio and space ratio decreased.
  • Full-length twisted tapes (s = 0) produced higher heat transfer rates, friction factors, and thermal performance factors than regularly-spaced configurations (s = 1.0, 2.0, and 3.0) due to more sustained swirl generation.

Cite This Study

Eiamsa-ard et al. (2014) studied this question.

synapsesocial.com/papers/69dcd5e55f91138675359a11https://doi.org/10.1016/j.csite.2014.04.002
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