Experimental investigation of the effects of mini-channel and flow arrangement on thermohydraulic performance of a shell and tube heat exchanger

Yıl 2025, Cilt: 40 Sayı: 3, 2029 - 2046, 21.08.2025

Murat Ünverdi , Mehmet Senan Yılmaz , Hasan Küçük

https://doi.org/10.17341/gazimmfd.1609616

Öz

Mini-channels (MCs) encountered in natural biological structures are becoming widespread in technological applications. In heat and mass transfer systems using MCs, compactness can be increased, and the size, volume and amount of working fluid can be reduced. In order to enhance the heat transfer using MCs, the changes in the overall heat transfer coefficient (OHTC) and pressure drop with counter and co-current (parallel) flow arrangements in the shell and tube mini-channel heat exchanger (ST-MC-HX) were experimentally investigated. In addition, the experimental results of the ST-MC-HX are compared with those of the shell and tube heat exchangers (ST-HXs) from the literature. Furthermore, the operating limits of the ST-MC-HX were determined with the performance index (). The counter flow experimental OHTCs vary between 1750-3950 W/m2K, while co-current flow experimental OHTCs vary between 1270-3675 W/m2K. The OHTCs of the ST-MC-HX are 25% higher on average than those in the literature. However, the use of MC increased the pressure drops. According to the performance index of the ST-MC-HX, the operating limits are 5000

Anahtar Kelimeler

Shell and tube heat exchanger, mini channel, flow arrangement, overall heat transfer coefficient, pressure drop

Bir gövde borulu ısı değiştiricide mini kanal ve akış düzenlemesinin termohidrolik performansa etkilerinin deneysel incelenmesi

Öz

Doğal biyolojik yapılarda karşılaşılan mini kanallar (MKlar), teknolojik uygulamalarda yaygınlaşmaktadır. MKlarla ısı ve kütle geçişi sistemlerinde kompaktlık artırılarak boyut, hacim ve aracı akışkan miktarı azaltılabilmektedir. MKlarla ısı geçişinin iyileştirilmesi amacıyla gövde borulu mini kanallı ısı değiştiricide (GB-MK-ID) zıt yönlü ve aynı yönlü (paralel) akış düzenlemeleriyle toplam ısı geçiş katsayısındaki (TIGK) ve basınç düşümündeki değişimler deneysel araştırılmıştır. Ayrıca GB-MK-IDnin deneysel sonuçları literatürden gövde borulu ısı değiştiricilerin (GB-ID) deneysel sonuçlarıyla karşılaştırılmıştır. Bunun yanı sıra performans indeksiyle () GB-MK-IDnin işletme limitleri belirlenmiştir. Zıt yönlü TIGKları 1750-3950 W/m2K aralığında değişirken, aynı yönlü deneysel TIGKları 1270-3675 W/m2K aralığında değişmektedir. GB-MK-IDnin TIGKları literatürdeki GB-IDlere göre ortalama %25 daha yüksektir. Ancak MK kullanmak basınç düşümlerini artmıştır. GB-MK-IDnin performans indeksine göre işletme limitleri 5000

Anahtar Kelimeler

Gövde borulu ısı değiştirici , mini kanal , akış düzenlemesi , toplam ısı geçiş katsayısı , basınç düşümü

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