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Author: search.filters.author.Eiamsa-Ard, SmithSubject: search.filters.subject.Baffle

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    Evaluation of heat transfer performance of a channel mounted with square-wing perforated V-type baffles
    (2025-01-01)
    Eiamsa-Ard, Smith
    ;
    Phila, Arnut
    ;
    Thianpong, Chinaruk
    ;
    Chuwattanakul, Varesa
    ;
    Maruyama, Naoki
    The current study examines the aerothermal performance behaviors of a rectangular-channel with square-wing perforated V-type baffles (SW-PVBs). The SW-PVBs were attached to lower channel walls at five attack angles, θ = 0° (solid V-type baffle), 22.5°, 45°, 67.5° and 90°. The heat transfer and pressure drop results of a channel without SW-PVBs were performed to normalize the results of the SW-PVBs and evaluate thermal performance factors (TPFs). It can be observed that as the attack angles decreased, the heat transfer and pressure loss rose. Among the SW-PVBs that were tested, those characterized by θ = 22.5° exhibited the most significant improvement in heat transfer, whereas SW-PVBs with θ = 45° gave the highest thermal performance factors. Additionally, the SW-PVBs with θ = 45° offered the highest TPF, as high as 1.93.
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    Thermal behaviors in a solar air heater channel with arc-shaped baffle turbulators
    (2014-01-01)
    Koolnapadol, Narin
    ;
    Kaewkohkiat, Yingyong
    ;
    Promvonge, Pongjet
    ;
    Eiamsa-Ard, Smith
    Influences of arc-shaped baffles turbulators (ASB) on thermal behaviors in a solar air heater channel are studied. In the experiment, the ASB with three pitch ratios (P/e) are placed on the absorber plate (bottom channel wall in this case) to generate stronger turbulence intensity in the channel. The distributions of temperature and local Nusselt number contours in the absorber plate fitted with ASB are observed with thermochromic liquid crystal (TLC) sheet. The results reveal that the heat transfer increases with the decrease in P/e due to longitudinal vortex flow effect. The heat transfer from employing the ASB at P/e = 4.0, 6.0 and 8.0 is higher than the smooth channel around 116%, 120% and 127%, respectively. This indicates that the ASB pitch spacing is optimal at 8 times baffle height in the present work.