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Author: search.filters.author.Chokphoemphun, S.Subject: search.filters.subject.Heat transfer enhancement

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    Parametric study on thermal performance augmentation of TiO2/water nanofluids flowing a tube contained with dual counter twisted-tapes
    (2024-07-01)
    Thianpong, C.
    ;
    Wongcharee, K.
    ;
    Kunnarak, K.
    ;
    Chokphoemphun, S.
    ;
    Chamoli, S.
    The study of compound heat transfer enhancement technique using dual counter twisted tapes (DCTs) together with TiO<inf>2</inf>/water nanofluids was carried out. The dual twisted tapes in form of counter-swirl tape arrangement were utilized at three twist ratios (y/w = 1.5, 2.0 and 2.5). TiO<inf>2</inf>/water nanofluids having three different volume concentrations (φ = 0.05, 0.10 and 0.15 %) were employed as the testing fluids. The results indicated that heat transfer rate, friction factor and thermal enhancement index rose with decreasing tape twisted ratio and elevating nanofluid concentration. The TiO<inf>2</inf>/water nanofluids applied in the present work offered higher Nu than pure water (the base fluid) by 7.3–10.0 %. The application of DCT with the smallest y/w of 1.5 and TiO<inf>2</inf>/water nanofluids with the largest φ of 0.15 vol% led to the highest thermal enhancement index (TEI) of 1.53, under the same pumping power criteria. Additionally, the k-nearest neighbor (k-NN) and artificial neural network (ANN) were developed to predict the thermal enhancement index (TEI). It was found that the k-NN and ANN models provided maximum R<sup>2</sup> values of 0.919 and 0.992 f, respectively.
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    Influence of combined non-uniform wire coil and twisted tape inserts on thermal performance characteristics
    (2010-08-01)
    Eiamsa-ard, S.
    ;
    Nivesrangsan, P.
    ;
    Chokphoemphun, S.
    ;
    Promvonge, P.
    In this paper, heat transfer, friction factor and thermal performance behaviors in a tube equipped with the combined devices between the twisted tape (TT) and constant/periodically varying wire coil pitch ratio are experimentally investigated. The periodically varying three coil pitch ratios were arranged into two different forms: (1) D-coil (decreasing coil pitch ratio arrangement) and (2) DI-coil (decreasing/increasing coil pitch ratio arrangement) while the twisted tapes were prepared with two different twist ratios. Each device alone is also tested and the results are subjected for comparison with those from the combined devices. The experiments were conducted in a turbulent flow regime with Reynolds numbers ranging from 4600 to 20,000 using air as the test fluid. Compared to each enhancement device, the heat transfer rate is further augmented by the compound devices. Over the range investigated, the highest thermal performance factor of around 1.25 is found by using DI-coil in common with the TT at lower Reynolds number. In addition, the empirical correlations of the heat transfer (Nu) and pressure drop (f) are also presented. © 2010 Elsevier Ltd.