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Performance increasement in shell-and-tube heat exchangers reinforced with dimpled tubes: A correlation-based approach

Mehrjardi, S. A. A ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijheatmasstransfer.2024.125489
  3. Publisher: 2024
  4. Abstract:
  5. Shell-and-tube heat exchangers (STHEs) are pivotal components in various industries, facilitating efficient heat transfer across fluid streams. The simulation of STHEs often demands a substantial number of computational cells, significantly when augmenting heat transfer surfaces by incorporating additional tubes or dimples. This study introduces a novel approach to mitigate the computational cost associated with STHE simulations. Correlations are designed to predict heat transfer within and outside the tubes, both in the presence and absence of dimples. These correlations are developed using the P-NTU thermal analysis method and a turbulence model that is carefully selected to align with the specific characteristics of STHEs. Following the validation of our approach, the correlations are applied to analyze the performance of various baffle arrangements within STHEs. Precisely, segmental, disk and donut baffle configurations, each featuring elliptical and teardrop dimples on the tube surfaces, are investigated. Furthermore, the impact of variations in shell and tube inlet mass flow rates on the overall performance of the heat exchanger is explored. The results reveal compelling findings. Elliptical dimples contribute to a remarkable enhancement in the performance evaluation criteria (PEC), yielding improvements of 36.7 % and 19.7 % for segmental as well as disk and donut baffle arrangements, respectively. Similarly, teardrop dimples exhibit their effectiveness, elevating the PEC by 51.5 % and 32.6 % in these same configurations under the specified working conditions. These findings contribute to the optimization of heat exchanger designs in diverse applications, fostering greater energy efficiency and environmental sustainability. © 2024 Elsevier Ltd
  6. Keywords:
  7. Elliptical dimples ; P-NTU analysis method ; Performance evaluation criteria (PEC) ; Shell-and-tube heat exchangers (STHEs) ; Teardrop dimples ; Energy efficiency ; Heat exchangers ; Heat transfer ; Petroleum reservoir evaluation ; Shells (structures) ; Sustainable development ; Tubes (components) ; Turbulence models ; Analysis method ; Elliptical dimple ; Ellipticals ; P-NTU analyse method ; Performance ; Performance evaluation criteria ; Shell-and- tube heat exchangers ; Shell-and-tube heat exchanger ; Teardrop dimple ; Thermoanalysis
  8. Source: International Journal of Heat and Mass Transfer ; Volume 226 , 2024 ; 00179310 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S001793102400320X