Chuwattanakul, Varesa

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Chuwattanakul, Varesa
Alternative Name
Chuwattanakul, V.
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Email
varesa.ch@kmitl.ac.th

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    Turbulent heat transfer enhancement in round tubes by inserting triple twisted-tapes
    (2015-01-01)
    Eiamsaard, S.
    ;
    Promthaisong, P.
    ;
    Chuwattanakul, V.
    Turbulent flow characteristics and heat transfer performances in a round tube equipped with triple twisted tapes are investigated numerically. Effects of the triple twisted tapes at different twist ratios on the heat transfer and thermal performance characteristics are reported. The results of velocity and temperature fields, and the local heat transfer coefficients as well as the flow structure in tube with tape inserts are also given. A round tube wall is subjected to a constant wall temperature condition. Thermal field, heat transfer and fluid flow characteristics are studied using computational fluid dynamics (CFD) analysis. Computations, based on a finite volume method, are carried out by utilizing the Renormalized Group (RNG) k-e turbulence model. The investigation is carried out for triple twisted tapes with y/W = 2.0, 3.0 and 4.0 in round tubes for laminar air flow with Reynolds numbers between 500 and 2000. It is found that the use of triple twisted tapes with smallest twist ratio of y/W =2.0 results in the highest heat transfer and friction factor while the use of the tapes with the largest twist ratio (y/W = 4.0) results in the highest thermal performance. The highest thermal performances based on the constant pumping power criterion of the tubes equipped triple twisted tapes with y/W = 2.0, 3.0 and 4.0 are 2.43, 2.63 and 2.73, respectively.
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    Thermal performance of heat exchanger tube installed with triple twisted-tapes
    (2020-09-01)
    Samutpraphut, B.
    ;
    Promthaisong, P.
    ;
    Wongcharee, K.
    ;
    Eiamsa-Ard, S.
    ;
    Chuwattanakul, Varesa
    A current study deals with the numerical analysis of heat transfer intensification, flow-thermal fields, local heat transfer distribution, friction factor and thermal performance behavior of the heat exchanger tubes installed with triple twisted tapes. Each set of triple twisted tapes consists of three twisted tapes having an identical twist ratio. Twisted tapes of interest have three different twisted ratios (y/w = 1.0, 1.5 and 2.0). Simulation was performed for the turbulent flow with Reynolds numbers (Re) ranging from 5000 to 20,000. Numerical results indicate that the use of triple twisted-tapes leads to heat transfer enhancement. Nusselt number (Nu) and friction factor (f) increase while thermal performance factor () decreases with decreasing twist ratio of triple twisted tapes. The Nusselt numbers of the tubes installed with triple twisted-tapes having twist ratios of 1.0, 1.5 and 2.0 are higher than those of the plain tube by around 3.34-4.45, 2.75-3.65 and 2.56-3.41 times, respectively. Friction factors (f) of the tubes installed triple twisted-tapes with twist ratios of 1.0, 1.5 and 2.0 are increased up to 46.1-49.7, 24.16-26.04 and 15.86-17.09 times, respectively, as compared to those of the plain tube. The maximum thermal performance factors of 1.21, 1.23 and 1.32 are obtained by using triple twisted tapes with y/w = 1.0, 1.5 and 2.0 at the Reynolds number of 5000.