International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 03 | Mar 2024
p-ISSN: 2395-0072
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Comparative Analysis of Heat Transfer and Skin Friction Characteristics in Circular and Diamond Shaped Tube Bank Arrangements MD. Rashid Hussain1, Dr. Ajay Singh2, Ashish Verma3 1Scholar, Department of Mechanical Engineering, Radharaman Institute of Technology and Science, Bhopal, M.P,
INDIA
2Head and Prof., Department of Mechanical Engineering, Radharaman Institute of Technology and Science,
Bhopal, M.P, INDIA
3Assistant Professor, Department of Mechanical Engineering, Radharaman Institute of Technology and Science,
Bhopal, M.P, INDIA ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This research paper investigates the heat transfer and skin friction characteristics of tube bank arrangements,
comparing circular and diamond-shaped configurations. The study explores how variations in longitudinal pitch impact Nusselt number and skin friction coefficient for different Reynolds numbers. The findings reveal several significant conclusions. First, transitioning from a circular tube arrangement to a diamond-shaped triangular tube bank arrangement results in a remarkable 35% reduction in skin friction coefficient. This substantial decrease underscores the potential benefits of diamond-shaped tube banks in terms of reducing drag and energy consumption. Second, the research indicates that for circular tube banks, the Nusselt number reaches its peak value when the longitudinal pitch is 2.5 times the tube diameter (2.5D). This optimal pitch length holds true across various Reynolds numbers, demonstrating the consistency of heat transfer performance in circular tube bank arrangements. Similarly, the skin friction coefficient in circular tube banks also reaches its maximum value at a longitudinal pitch of 2.5D, aligning with the Nusselt number trend. In contrast, the study highlights specific nuances in diamond-shaped tube bank arrangements. Initially, the Nusselt number is maximized at a longitudinal pitch of 2D for Reynolds numbers up to 12,000. However, beyond this threshold, a longitudinal pitch of 3D offers the highest Nusselt number values, indicating a transition in optimal pitch length. Additionally, in diamond-shaped tube banks, the minimum skin friction coefficient is achieved with a longitudinal pitch of 2.5D, showcasing a distinct behavior compared to circular arrangements. This research paper provides valuable insights into the performance differences between circular and diamond-shaped tube bank arrangements, shedding light on the potential for optimizing heat transfer and reducing drag in various engineering applications. Key Words: Tube Bank Arrangement, CFD, Diamond Shape, Circular Shape, Skin Friction Coefficient, Nusselt Number
1.INTRODUCTION Tube bank arrangements play a pivotal role in numerous engineering and industrial applications where heat transfer, pressure drop, and energy efficiency are critical concerns. These configurations of closely packed tubes are extensively used in heat exchangers, boilers, condensers, and other systems to facilitate the exchange of thermal energy between a fluid and solid surface. The efficiency and performance of these systems are significantly influenced by the geometric arrangement of the tubes within the banks. The design of tube banks involves a delicate balance between maximizing heat transfer rates and minimizing the associated pressure drop or skin friction. Achieving this balance is of paramount importance in enhancing the overall effectiveness of heat exchangers and similar devices. Engineers and researchers have, therefore, devoted considerable efforts to understanding the impact of various tube bank configurations on heat transfer and fluid flow characteristics. One intriguing area of investigation is the comparison between traditional circular tube arrangements and alternative geometric configurations, such as diamond-shaped triangular tube banks. By altering the shape and orientation of tubes within a bank, it is possible to significantly influence heat transfer and fluid dynamics, potentially leading to more efficient and cost-effective solutions. This research aims to contribute to this ongoing discourse by systematically analysing and comparing the performance of circular and diamond-shaped tube bank arrangements. This paper presents a comprehensive examination of the Nusselt number, a dimensionless parameter used to quantify heat transfer, and the skin friction coefficient, a measure of drag, for both circular and diamond-shaped tube banks. We investigate how variations in longitudinal pitch impact these parameters across different Reynolds numbers, shedding light on the optimal configurations for various engineering applications. The findings of this research are expected to have far-reaching implications, offering valuable insights into the design and optimization of tube bank arrangements to meet the demands of diverse industries, from aerospace to energy production, where heat exchange and fluid flow are fundamental processes.
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