Numerical Evaluation of Thermo-Hydraulic Performance Index of a Double Pipe Heat Exchanger Using Double Sided Louvered Winglet Tape

Abstract

The decade has witnessed great importance of numerical techniques for scientists and researchers in deciding the correctness, stability, and reliability of new designs. In the present study a numerical technique has been implemented to investigate the thermo-hydraulic performance of the Louvered winglet tape inside the tube section of the double pipe heat exchanger. The Louvered winglet tape has been examined with the slope angle of 50, 100, 150 and 210 to study their thermal characteristics. The Reynolds number 4000-30000 was examined on slope angle of 50, 100, 150 and 210 to study their flow characteristics in the turbulent domain. A smooth pipe was examined to evaluate heat transfer characteristics in terms of Nusselt number and friction coefficient over augmented tube with Louvered winglet tape. The results show a satisfactory performance of Louvered winglet tape over the smooth tube with a similar trend of friction factor, Nusselt number, and thermo-hydraulic performance index (THPI). The percentage of increment of the Nusselt number of the results is found to be 237.04%, 258.4%, 275.11%, and 289.72% when compared to smooth pipe with respect to slope angle of 50, 100, 150 and 210, respectively. The amount of increase in the friction factor in comparison with plain tube is 5.13, 6.73, 8.33, and 11.73 times of that of smooth pipe with respect to slope angle of 50, 100, 150 and 210, respectively. The Louvered winglet tape with slope angle 150 has shown to be promising with respect to higher THPI when considering with other slope angle of 50, 100, and 210. The maximum THPI of 1.85 was obtained for slope angle 150 at Re 12000. Similarly, the THPI values for other slope angle 50, 100, and 210 are 1.71, 1.78 and 1.69. In addition to better performance the Louvered winglet tape can be easily fabricated and adapted for a wide variety of heat transfer industries.

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Review of passive methods of heat transfer enhancement in helical tube heat exchanger

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Kanatçikli Bant Ti̇pi̇ Türbülatörleri̇n Isi Transferi̇ Ve Sürtünme Faktörü Üzeri̇ndeki̇ Etki̇si̇ni̇n Nümeri̇k Anali̇zi̇

“…Analizler sonucunda, bükümlü banttaki kanat sayısı tek kanattan dört kanada çıkarıldığında; Nusselt sayısında % 3.1, basınç düşüşünde % 64 ve performans katsayısında % 63.9 artış olduğunu tespit etmişlerdir. Thejaraju et al (2020) çift borulu ısı değiştiricisinin iç borusunun içerisine çift taraflı kanatçıklı bant tipi türbülatörler yerleştirerek türbülatörün termo-hidrolik performansını sayısal olarak incelemişlerdir. Çalışma, türbülatörün farklı kanatçık eğim açıları ve farklı Reynolds sayılarında yapılmıştır.…”