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Multiphysics Analysis of Weld Defects and Thermal Contact Resistance in H-Fin Tube | ||
| Journal of Heat and Mass Transfer Research | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 08 آذر 1404 | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2025.38895.1822 | ||
| نویسندگان | ||
| Bhanudas D Bachchhav* 1؛ Kiran K Sirsath2؛ Somnath D Nandi2 | ||
| 1Department of Mechanical Engineering, All India Shri Shivaji Memorial Society's College of Engineering, 1, Kennedy Road, Pune. 411 001. | ||
| 2Department of Technology, Savitribai Phule Pune University | ||
| تاریخ دریافت: 10 شهریور 1404، تاریخ بازنگری: 10 آبان 1404، تاریخ پذیرش: 08 آذر 1404 | ||
| چکیده | ||
| This study investigates the thermal–hydraulic performance of a single H-type fin-and-tube heat exchanger, emphasizing the influence of weld quality and thermal contact resistance at the fin–tube interface. The research addresses a critical gap regarding how imperfect welds and interfacial resistance affect the efficiency of H-type fin–tube heat exchangers commonly used in waste heat recovery applications. The methodology combines physical modeling to conceptualize geometry and thermal–fluid interactions, mathematical formulation to define governing equations for conjugate heat transfer and turbulent flow, and numerical simulations using ANSYS FLUENT to evaluate steady-state performance. Results show that a thin resistive layer with a thermal contact resistance of 3.08 × 10⁻⁶ K•m²/W reduces the overall heat transfer coefficient, Nusselt number, and Colburn j-factor by approximately 8%, while the friction factor remains largely unaffected. Velocity and temperature profiles reveal localized flow acceleration and temperature gradients near imperfect welds, highlighting regions prone to thermal hotspots. Discontinuous welds with incomplete penetration (GL/Ft = 0, Gw = 0.01 mm) immediately reduce heat transfer efficiency by 13%, escalating to ~50% over long-term operation due to localized overheating, corrosion, and fatigue. The novelty of this work lies in its Multiphysics framework, which quantifies hidden effects of weld discontinuities and provides practical insights for heat exchanger design optimization, weld quality assurance, and long-term reliability of compact energy recovery systems. | ||
| کلیدواژهها | ||
| Thermal Contact Resistance؛ Thermal-Hydraulic Performance؛ Single H-fin؛ Numerical Modelling؛ Weld Joint Defect؛ Cu Cr Zr Alloy | ||
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آمار تعداد مشاهده مقاله: 120 |
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