Numerical investigation and design optimization of a novel polymer heat exchanger with ogive sinusoidal wavy tube

Heeseung Kang, Ukmin Han, Hongyoung Lim, Hoseong Lee, Yunho Hwang

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, a novel polymer bare-tube heat exchanger (BTHX) with an ogive tube shape and a sinusoidal wavy channel is proposed and investigated for the liquid-to-gas application. The thermal-hydraulic performance of the proposed polymer BTHX is calculated using a validated computational fluid dynamics (CFD) simulation model, and the performance is optimized by setting nine independent design variables. A selective-series CFD method with an approximation-assisted optimization technique is developed for the multi-objective optimization to reduce the computational time. As a result, the thermal-hydraulic performance of the optimized novel polymer BTHX shows 91.5% and 134.9% of that of the target aluminum louvered-fin micro-channel heat exchanger (MCHX), respectively. This is mainly due to the improved air-side heat transfer coefficient of the proposed polymer BTHX by 70.2% compared to the target aluminum MCHX. Compared to the recent teardrop-shaped polymer BTHX, the thermal-hydraulic performance of the proposed BTHX is significantly improved. Regarding the polymer thermal conductivity, it is found that the thermal performance degradation can be minimized with at least 8.0 W∙m−1∙K−1 of the thermal conductivity. The flow field of the proposed polymer BTHX is also discussed and shows that the unique structure of the sinusoidal wavy tube can reduce the air-side pressure drop and promote the mixing of the air flow, thereby improving the air-side convective heat transfer.

Original languageEnglish
Article number120785
JournalInternational Journal of Heat and Mass Transfer
Volume166
DOIs
Publication statusPublished - 2021 Feb

Keywords

  • Bare-tube heat exchanger
  • Multi-objective optimization
  • Polymer heat exchanger
  • Selective-series CFD
  • Sinusoidal wavy channel

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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