A CFD Analysis to Investigate the Effect of Inserts on the Overall Heat Transfer Coefficient in a Concentric Tube Heat Exchanger
Received: 2 September 2024 | Revised: 18 September 2024 | Accepted: 22 September 2024 | Online: 16 October 2024
Corresponding author: Naveedul Hasan Syed
Abstract
In the present study, a U-bend concentric tube heat exchanger has been modeled using Computational Fluid Dynamics (CFD) through ANSYS Fluent software to study the influence of different variables on the overall heat transfer coefficient (U). Following the successful validation of the CFD model, an analysis was conducted to examine the impact of five distinct star-shaped inserts on U enhancement in the U-bend concentric tube heat exchanger. The analysis demonstrated that the maximum U values, which were 381.21 W/m²K and 468.96 W/m²K, were attained at a hot water flow rate of 0.007 L/s when 14 mm plain and twisted star-shaped inserts were, respectively, employed. The incorporation of the inserts resulted in the generation of a secondary fluid motion within the tube, which in turn induced turbulence and consequently enhanced the heat transfer rate. However, the turbulence generated within the tube was attributed to the high pressure drop occurring there. The pressure drop within the inner tube was found to be 129.27 Pa and 149.44 Pa for the plain and twisted star-shaped inserts, respectively. The impact of elevated pressure drops for all five star-shaped insert types was examined and revealed to be the greatest for the 7 mm twisted insert, which was identified as the optimal choice for operational use. This conclusion was based on the observation that the twisted insert exhibited the highest U (390.89 W/m²K) at a pressure drop of 35.30 Pa, achieved at a hot water flow rate of 0.007 L/s.
Keywords:
energy, finite element method, meshing, simulations, velocity vectorDownloads
References
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Copyright (c) 2024 Naveedul Hasan Syed, Naseer Ahmed Khan, Naveed Ahmad, Murad Khan, Farooq Ahmad, Fiza Humayun, Samiul Haq, Ibrahim Ali Alsayer, Ibrahim Abdullah Altuwair
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