Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Thermo-hydraulic Effect of Tubular Heat Exchanger Fitted with Perforated Baffle Plate with Rectangular Shutter-type Deflector

  • Md Atiqur Rahman (Department of Mechanical Engineering, Birla Institute of Technology)
  • Received : 2023.10.21
  • Accepted : 2024.04.08
  • Published : 2024.05.01
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Abstract

A study was conducted on a tubular heat exchanger to improve its heat transfer rate by using a novel baffle plate design with discontinuous swirling patterns. The design consisted of perforated baffle plates with rectangular air deflectors positioned at varying angles. The tubes in the heat exchanger were arranged in a consistent alignment with the airflow direction and exposed to a uniform heat flux on their surfaces. Each baffle plate included sixteen deflectors inclined at the same angle and arranged in a clockwise pattern. This arrangement induced a swirling motion of the air inside a circular duct where the heated tubes were located, leading to increased turbulence and improved heat transfer on the tube surfaces. The spacing between the baffle plates was adjusted at different pitch ratios, and the Reynolds number was controlled within a range of 16,000 to 29,000. The effects of pitch ratios and inclination angles on the heat exchanger's performance were analyzed. The results indicated that using a baffle plate with rectangular deflectors inclined at 30° and a pitch ratio of 1.2 resulted in an average increase of 1.29 in the thermal enhancement factor.

Keywords

Acknowledgement

The authors express their gratefulness to the Mechanical Engineering Department at BIT-Mesra, India, for their support, resources, and motivation.

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