NUMERICAL AND EXPERIMENTAL INVESTIGATION OF TUBE BUNDLE HEAT EXCHANGER ARRANGEMENT EFFECT ON HEAT TRANSFER PERFORMANCE IN TURBULENT FLOWS

Year 2023, Volume: 43 Issue: 2, 175 - 190, 17.11.2023

Erman Aslan , İmdat Taymaz , Kemal Çakır , Elif Eker Kahveci

https://doi.org/10.47480/isibted.1391408

Cited By: 1

Abstract

This study examines the friction factor, convective heat transfer, and area goodness factor of both inline and staggered tube bundles. The Finite Volume Method (FVM) is used for numerical simulations. Experimental and numerical approaches are utilized. Both 18.0 mm and 21.6 mm longitudinal distances are investigated. It is recommended to use ratio coefficients to reduce computation time. The proportion coefficients are used to obtain predictions for the three-dimensional cases based on the two-dimensional results or to transfer the 2D results to 3D. In addition, three turbulence models were utilized and compared within an Unsteady Reynolds Averaged Navier-Stokes (URANS) formulation. Experimental results validated numerical predictions. The thermal boundary conditions consist of a constant inlet temperature and a uniform heat flux on the support plate. Reynolds number is changed from 989 to 6352, while the Prandtl number remains at 0.70. Nusselt number and friction factor values have been observed to increase with increasing Reynolds number in all geometric configurations. The staggered configurations result in greater Nusselt number and friction factor values compared to inline configurations. The Nusselt number and pressure drop experience negative and positive effects, respectively, as the distance between rows decreases. SST turbulence models typically predict reasonable outcomes for all geometric configurations.

Keywords

Friction factor, Convective heat transfer, Tube bundle, Unsteady Reynolds averaged numerical simulations, Finite volume method

TÜRBÜLANSLI AKIŞLARDA ISI TRANSFER PERFORMANSI ÜZERİNDEKİ BORU DEMETLİ ISI DEĞİŞTİRİCİ SIRALAMA ETKİSİNİN SAYISAL VE DENEYSEL İNCELENMESİ

Abstract

Düzgün ve kaydırılmış sıralı hatlara sahip boru demetlerinin sürtünme faktörü, taşınımla ısı geçişi ve alan uyum faktörü özellikleri deneysel ve sayısal olarak incelenmiştir.Sonlu Hacim Yöntemi (FVM) kullanılmıştır. 18.0 mm ve 21.6 mm olmak üzere iki farklı uzunlamasına mesafe incelenmiştir. Daha az hesaplama için oran katsayılarının kullanılması önerilir. Orantı katsayıları, iki boyutta elde edilen sonuçlara dayanarak üç boyutlu durumlar için tahminler elde etmek, başka bir deyişle 2B sonuçları 3B'ye aktarmak için uygulanır.Bir URANS (farklı Kararsız Reynolds Ortalama Navier-Stokes) formülasyonunda üç türbülans modeli kullanıldı ve birbirleriyle karşılaştırıldı. Sayısal tahminler deneysel sonuçlarla doğrulandı.Isıl sınır koşulu olarak, girişte sabit sıcaklık uygulanır ve destek plakasında üniform ısı akışı gerçekleşir. Reynolds sayısı 989'dan 6352'ye değiştirilmiş ve Prandtl sayısı 0.70'de tutulmuştur. Nusselt sayısı ve sürtünme faktörü değerleri tüm geometrik konfigürasyonlar için Reynolds sayısı ile artmıştır .Kaydırılmış sıralamalar, düzgün düzenlemeye kıyasla daha büyük Nusselt sayısı ve sürtünme faktörü değerlerine yol açmıştır. Nusselt sayısı ve basınç düşüşü, sıralar arasındaki boyuna mesafenin azalmasıyla sırasıyla negatif ve pozitif etkiye sahiptir.Genel olarak, SST türbülans modelleri, tüm geometrik konfigürasyonlar için makul sonuçlar vermiştir.

Keywords

Sürtünme faktörü, Taşınımla ısı geçişi, Boru demeti, Zamana bağlı Reynolds ortalamalı sayısal benzeşim, Sonlu hacimler yöntemi.

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