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Heat transfer characteristics in a channel fitted with zigzag-cut baffles

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Abstract

The heat transfer characteristics were experimentally investigated in a wind channel with different types of cut baffles for heat transfer augmentation. The aim of using zigzag-cut baffles is to create 3D flow structure behind the baffles instead of transverse vortex flow leading to enhance heat transfer. In this study, 4 types of baffles were examined; conventional baffle (Rectangular cross section with no cut), baffle with rectangular zigzag-cut, baffle with triangle zigzag-cut at 45 degree and at 90 degree. All of the baffles have the same height at H = 15 mm and flow blocking area. In the experiment, the row of seven baffles was attached on the inner surface of wind channel. The effects of pitch spacing length were also investigated at baffle pitch distance P/H = 4, 6 and 8 (H: Height of baffle). The experiments were performed at constant Reynolds number (Re) of 20000. The heat transfer patterns via Thermochromic liquid crystal sheet were visualized and recorded with a digital camera. The recorded images were then analyzed with image processing technique to obtain the distribution of Nusselt number. The flow characteristics pass through the baffles were also numerically studied with CFD simulation for understanding the heat transfer characteristics. The friction losses were measured to evaluate the thermal performance for each baffle. It was found that the baffle with rectangular zigzag-cut gives the best thermal performance due to heat transfer augmentation in upstream and downstream side of baffle.

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand

    Chayut Nuntadusit & Makatar Wae-hayee

  2. Department of Mechanical Engineering, Faculty of Engineering, Princess of Naradhiwas University, Naradhiwas, 96000, Thailand

    Ibroheng Piya

  3. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok, 10530, Thailand

    Smith Eiamsa-ard

Authors
  1. Chayut Nuntadusit
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  2. Ibroheng Piya
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  3. Makatar Wae-hayee
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  4. Smith Eiamsa-ard
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Additional information

Recommended by Associate Editor Dae Hee Lee

Chayut Nuntadusit is an Assistant Professor of Mechanical Engineering at Prince of Songkla University, Thailand. He received Ph.D. at Osaka University in 2004. His current interests include heat transfer enhancement for jet impingement, jet flow control and optical measurement.

Ibroheng Piya is fellow at Department of Mechanical Engineering, Faculty of Engineering, Princess of Naradhiwas University, Thailand. He received Master of Engineering in Mechanical Engineering from Prince of Songkla University, Thailand in 2013. His research includes flow and heat transfer engineering and computational fluid dynamics.

Makatar Wae-hayee is a postdoctoral researcher of Mechanical Engineering at the Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Thailand. He received Ph.D. at the same university in 2014. He concerns in flow and heat transfer of impinging jet, rib, pin fin and etc.

Smith Eiamsa-ard is an Associate Professor of Mechanical Engineering at Mahanakorn University of Technology (MUT), Thailand. He obtained his D.Eng. in Mechanical Engineering from King Mongkut’s Institute of Technology Ladkrabang. He has been working at MUT since 1996. His research interests include Thermal&Fluid engineering, heat transfer enhancement and computational fluid dynamics.

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Nuntadusit, C., Piya, I., Wae-hayee, M. et al. Heat transfer characteristics in a channel fitted with zigzag-cut baffles. J Mech Sci Technol 29, 2547–2554 (2015). https://doi.org/10.1007/s12206-015-0552-9

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  • DOI: https://doi.org/10.1007/s12206-015-0552-9

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