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Experimental and Numerical Study of Enhancement Heat Transfer Coefficient of TiO2/Water Nanofluid in Spiral Fluted Tube Equipped with Twisted Tape

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Objective: Experimental and numerical investigation has been performed in this work to study the enhancement of heat transfer coefficient of TiO2/water nanofluid in spiral fluted tube equipped with twisted tape.

Method: The performance of spiral fluted tube equipped with twisted tape heat exchanger with and without nanofluid was investigated experimentally. The concentration of nanofluid was varied from 0.08 to 0.3% while the twisted ratio (y/w) of twisted tape was kept constant at 4.0. Steam was used as a heating source where constant wall temperature condition (110 °C) was achieved. The experiments were performed in turbulent regime (Reynolds number spanned 7000 ≤ Re ≤ 15000).

Results: Experimental results reveal that the use of spiral fluted tube equipped with twisted tape without nanofluid leads to an increase in 37% to 43% in heat transfer coefficient compared with smooth tube. The maximum increase in heat transfer coefficient occurs with nanofluid at 0.3% concentration, which was about 28.0% to 32.0% higher than the pure water in spiral fluted tube equipped with twisted tape. Empirical correlation for the thermal process was developed and represented in terms of Nusselt number. Numerical simulation has been carried out on present heat exchanger to analyze both flow field and heat transfer using ANSYS FLUENT package 14. The comparison between experimental and numerical results showed good agreement.
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Keywords: Heat exchanger; coefficient; nanofluid; spiral fluted tube; surface vibration; twisted tape

Document Type: Research Article

Publication date: August 1, 2017

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  • Nanoscience & Nanotechnology-Asia publishes expert reviews, original research articles, letters and guest edited issues on all the most recent advances in nanoscience and nanotechnology with an emphasis on research in Asia and Japan. All aspects of the field are represented including chemistry, physics, materials science, biology, and engineering mainly covering the following; synthesis, characterization, assembly, theory, and simulation of nanostructures (nanomaterials and assemblies, nanodevices, nano-bubbles, nano-droplets, nanofluidics, and self-assembled structures), nanofabrication, nanobiotechnology, nanomedicine and methods and tools for nanoscience and nanotechnology.The Journal offers thorough and authoritative reviews, perspectives on cutting-edge research and discussions of topics that provide distinctive views about the future of nanoscience and nanotechnology.
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