Airside Performance of Fin-and-Tube Heat Exchangers Having Sine Wave or Sine Wave-Slit Fins

Kim, Nae-Hyun; Youn, Baek

doi:10.1615/jenhheattransf.2013006564

Cited by 4 publications

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“…The louvers are formed by punching the metal and are protruded out from the base metal (Shah and Sekulic, 2003). Although wide studies on flat, wavy, and slit fins can be found in the literature (Awad and Muzychka, 2011;Glazar et al, 2012;Jang and Yang, 1998;Jiao and Baek, 2005;Kim and Cho, 2015;Kim and Youn, 2013;Lin et al, 2008;Sadeghianjahromi et al, 2018bSadeghianjahromi et al, , 2020Taler, 2004;Tao et al, 2007;Wang et al, 1996Wang et al, , 1999Wang et al, , 2000, louver fins still attract a lot of attention for further optimization from the aspects of experimental and numerical investigations, Kays and London (1950) were the first, who summarized experimental results related to louver fins. The first paper regarding two-dimensional numerical simulations on louver fins was prepared by Baldwin et al (1987).…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Louver Fin-and-Tube Heat Exchangers-a Parametric Approach

et al. 2020

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3D turbulent flow numerical simulations are performed to study heat transfer and flow friction characteristics of louver fin-and-tube heat exchangers. The effects of louver angle, fin pitch, transversal tube pitch, and longitudinal tube pitch on Colburn and friction factors are investigated in detail. Three stages of the effect of louver angle on the Colburn j factor are identified, including rising, level-off, and increasing again. A wide range for louver angle ranging from 0°(plain fin) to 80°i s considered. Results show that the Colburn factor increases from a louver angle of 0°(plain fin) to 20°, followed by a level-off or slight decline until the louver angle reaches 45°, and finally, the Colburn factor is increased again with a further rise of louver angle. However, the friction factor increases with an increase in louver angle from 0°(plain fin) to 80°. Colburn and friction factors are almost independent of fin pitch while they decrease with an increase in transversal and longitudinal tube pitches. The optimum louver angle is around 20°upon carrying out the full factorial method in maximizing Colburn factor and minimizing friction factor.

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Section: Introductionmentioning

confidence: 99%

Optimization of the Louver Fin-and-Tube Heat Exchangers-a Parametric Approach

et al. 2020

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“…Both enhancement of refrigerant condensation and dropwise condensation (especially of water) have critical implications for energy conservation in HVAC and power generation. Addressing the air-side forced convection in fin-tube cores, typically the dominant thermal resistance in refrigerant or wasteheat-recovery exchangers, another study (Kim and Youn, 2013) has explored the use of enhanced wavy-slit fins. The advances in micro-scale manufacturing has also provided new avenues for constructing miniature flow channels and micro jets for cooling and thermal management, as explored by Warrier and Dhir (2013), and for generating structured porous surfaces (treated surfaces) in minichannels for two-phase flow enhancement (Carbajal et al, 2013).…”

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confidence: 99%