Disk ve Halka Perdeli ve Merkez Borusuz Bölgeye Sahip Kabuk-Boru Isı Değiştiricilerinin Termal–Hidrolik Performansı

Abstract

Bu çalışma, özgün bir boru demeti konfigürasyonuna sahip kabuk-boru tipi bir ısı değiştiricinin ısı transferi performansına ilişkin ayrıntılı sayısal bir inceleme sunmaktadır. Bu tasarımda, destek yapısının merkezindeki dairesel bölgede hiçbir ısı değişim borusu yerleştirilmemiştir ve böylece merkezde boşluk bulunan bir boru demeti düzeni elde edilmiştir. Analiz, farklı borusuz bölge boyutlarının genel ısı transferi özellikleri üzerindeki etkisine odaklanmaktadır. Sonuçlar, borusuz bölgedeki kendi kendine ısı değişiminin, kabuk tarafı ile boru tarafı arasındaki ısı dağılımının homojenliğini önemli ölçüde artırdığını göstermektedir. Ayrıca, borusuz bölge boyutu arttıkça bu homojenlik daha da gelişmekte olup pozitif bir korelasyon sergilemektedir. Borusuz bölgenin genişletilmesi, enerji tüketimini etkin bir şekilde azaltabilir ve işletme verimliliği ile ekonomik performansı iyileştirebilir. Ancak bu durum, ısı değişim yüzey alanının azalmasına bağlı olarak ısı transfer yoğunluğunda bir azalmaya da yol açmaktadır. Borusuz bölge boyutu 140 mm’den 440 mm’ye artırıldığında, ısı transferi homojenliği %65,9 oranında iyileşirken kabuk tarafı ısı transfer katsayısı %22,1 oranında azalmaktadır. TOPSIS karar verme yöntemine dayalı kapsamlı performans değerlendirmesi, 380 mm’lik borusuz bölge boyutunun ısı transfer yoğunluğu ile homojenlik arasında en uygun dengeyi sağladığını göstermektedir. Bu koşul altında, kabuk tarafı ısı transfer katsayısı 6594 W/(m²·K) değerine ulaşırken, boru tarafı çıkış sıcaklığının göreli standart sapması 0,601 olarak elde edilmiş ve en iyi genel performansı temsil etmiştir.

Keywords

• kabuk-boru tipi ısı değiştirici
• disk ve halka tipi yönlendirici
• Fluent
• ısı transferi
• TOPSIS

Project Number

11872043； SUSE652A004

Thermal–Hydraulic Performance of Shell-and-Tube Heat Exchangers with Disc-and-Ring Baffles and a Central Tube-Free Zone

Abstract

This study presents a detailed numerical investigation of the heat transfer performance of a shell-and-tube heat exchanger featuring a distinctive tube bundle configuration. In this design, no heat exchange tubes are arranged within the circular region at the center of the support structure, resulting in a tube bundle layout with a central cavity. The analysis fo-cuses on the effect of different non-tube region sizes on overall heat transfer characteris-tics. The results show that self-heat exchange within the non-tube region significantly en-hances the uniformity of heat distribution between the shell side and tube side. Moreover, the uniformity improves with the increase in the non-tube region size, showing a positive correlation. Enlarging the non-tube region can effectively reduce energy consumption and improve operational efficiency and economic performance. However, this also results in a decrease in heat transfer intensity due to the reduction of the heat exchange surface area. When the size of the tube-free region increases from 140 mm to 440 mm, the heat transfer uniformity improves by 65.9%, whereas the shell-side heat transfer coefficient decreases by 22.1%. A comprehensive performance evaluation based on the TOPSIS deci-sion-making method indicates that a tube-free region size of 380 mm provides the optimal balance between heat transfer intensity and uniformity. Under this condition, the shell-side heat transfer coefficient reaches 6594 W/(m²·K), and the relative standard de-viation of the tube-side outlet temperature is 0.601, representing the best overall perfor-mance.

Keywords

• shell-and-tube heat exchanger
• disc-and-donut baffle
• Fluent
• heat transfer
• TOPSIS

Supporting Institution

This work was supported by the National Natural Science Foundation of China (Grant No. 11872043) and the Scientific Research and Innovation Team Program of Sichuan University of Science and Engineering (Grant No. SUSE652A004).

Project Number

11872043； SUSE652A004

Ethical Statement

The authors declare that this manuscript is original, has not been published previously, and is not under consideration elsewhere. All authors have approved the manuscript and agree with its submission.The authors declare no conflicts of interest.

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