Large eddy simulation of flow through in-line heat exchanger tube bundles
Başlık çevirisi mevcut değil.
- Tez No: 772201
- Danışmanlar: DR. IMRAN AFGAN
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, İnşaat Mühendisliği, Astronomi ve Uzay Bilimleri, Mechanical Engineering, Civil Engineering, Astronomy and Space Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2017
- Dil: İngilizce
- Üniversite: The Unıversıty Of Manchester
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
A numerical study has been conducted to investigate the effect of longitudinal and transverse pitch ratios of inline tube bundles on flow stability and heat transfer using Large Eddy Simulation (LES) approach with dynamic Smagorinsky model. The simulations have been performed using a commercial software STAR CCM+. Square pitch ratios of 1.2x1.2, 1.5x1.5, 1.6x1.6, 1.75x1.75 and non-square pitch ratios of 1.5x1.75, 1.5x2, 1.75x1.5, 2x1.5 have been investigated to observe individual effects of longitudinal and transverse pitch ratios on flow characteristics. All simulations have been conducted using periodicity in all directions with complete 3D at unsteady state. Air has been selected as a working fluid and Reynolds number based on gap velocity has been kept constant at 15000 in all simulations by adjusting the mass flow rate accordingly. The square pitch ratio of 1.6x1.6 has been selected to compare the numerical results with the experimental findings of Aiba et al. (1982) and LES study of Afgan (2007). The pressure coefficient around the central cylinder and the velocity profile at the wake of central cylinder showed a satisfactory agreement with findings of Aiba et al. (1982) and Afgan (2007). Strouhal numbers obtained from square pitch arrangements have exhibited good agreement with measurements of Fitz-hugh (1973). Narrow square pitch ratio of 1.2x1.2 has shown a diagonal flow tendency with alternating asymmetric behaviour and contained a very small vortex due to the delayed flow separation. Considerably high Storuhal number and drag coefficient have been observed due to the presence of proximity interface and stagnation point close to central cylinder centerline with the narrow square gap ratio. The flow separation has occurred earlier when the square pitch ratio is increased. Relaxions in square pitch ratio have reduced the maximum turbulence intensity, maximum velocity and Strouhal number resulting in developing symmetry and stability. Lift and drag coefficients have been affected by the location of stagnation points, they have not therefore shown a gradual increasing or decreasing trend with pitch relaxations. Maximum Nusselt number have been observed at the stagnation points. Observations from the non-square pitch ratios have showed that flow characteristics have been mostly affected by the longitudinal distance. However, the effect of transverse distance cannot be ignored considering its effect on pressure coefficient profile around the central cylinder and drag coefficient.
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