Agung Tri Wijayanta, Budi Kristiawan, Pranowo, Agung Premono, Muhammad Aziz
A computational solution of an enhanced tube equipped with a backward louvered strip insert with various pitches was evaluated in this work. A k-ε renormalized group turbulence model has been applied for the turbulent model. Different pitches, S, of 40, 50, and 60 mm were investigated for the Reynolds number with a range of 10,000–17,500 using water as a working fluid. The extra louvered strip caused fluid flow disturbance, so that the flow pattern formed more turbulence. The turbulent flow was characterized by the flow pattern on the back of the inserts that form a vortex. The vortices formed caused a better heat transfer. The results of the computational analysis showed that the enhanced tube had a louvered strip with a pitch distance S = 40, 50, and 60 mm could increase the Nusselt numbers to 1.81, 1.75, and 1.72, and the friction factor to 7.59, 6.51, and 5.77 times greater than the plain tube, respectively. © 2019 by the authors.
Department of Mechanical Engineering, Faculty of Engineering, Universitas Sebelas Maret, Kampus UNS Kentingan, Jl. Ir. Sutami 36A Jebres, Surakarta, 57126, Indonesia; Research Group of Sustainable Thermofluids, Universitas Sebelas Maret, Kampus UNS Kentingan, Jl. Ir. Sutami 36A Jebres, Surakarta, 57126, Indonesia; Department of Informatics, Universitas Atma Jaya Yogyakarta, Jl. Babarsari 44, Yogyakarta, 55281, Indonesia; Department Mechanical Engineering, Jakarta State University, Jl. UNJ Kampus A, Jl. Rawamangun Muka, Jakarta Timur, 13220, Indonesia; Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan; Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
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