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Effect of bends on the heat transfer and hydrodynamics of hot oil in the coils of the radiation section of an industrial furnace
Mohsen Peyghambarzadeh *1
1- Islamic Azad University, Mahshahr branch , peyghambarzadeh@gmail.com
Abstract:   (79 Views)
In this study, a three-dimensional steady state simulation of the coil containing hot oil in the radiation section of the vertical cylindrical furnace of an industrial unit was investigated. This coil has nine U-shaped bends with an angle of 180 degrees. Using computational fluid dynamics, flow velocity and pressure, fluid outlet temperature, and coil wall temperature in different parts of the system were calculated. To validate the model, comparison of the simulation results of the coil wall temperature at the end of the fluid path and the fluid temperature at the outlet with industrial values ​​has been performed. Comparison of the computed wall temperature and fluid temperature at the coil outlet with the industrial values showed deviations of about 6% and 0.44%, respectively. The presence of bends in the coil caused some fluctuations in the parameters along the coil. Centrifugal force due to the curved geometry of the coil changed the pressure distribution, and this pressure change caused the fluid velocity and temperature, and wall temperature to fluctuate, so that in the bend, the pressure fluctuated about 4952 Pa, fluid velocity changed up to 2.83 m/s, the fluid temperature varied to about 2 K, and the wall temperature difference was about 10 K.
 
Keywords: Simulation, Hot oil furnace coil, Computational fluid dynamics, 180-degree bend
     
Type of Study: Research | Subject: Heat exchangers
Received: 2021/07/17 | Accepted: 2021/08/24
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مجله علمی تخصصی مهندسی مکانیک تبدیل انرژی Journal of Energy Conversion
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