Heat transfer enhancement with nanofluids under laminar pulsating flow in a trapezoidal-corrugated channel
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Tarih
2017
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Inderscience Enterprises Ltd.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, the heat transfer characteristics of CuO-water-based nanofluids in a trapezoidal-corrugated channel under pulsating inlet flow conditions are investigated numerically. The simulations are performed for different Reynolds numbers, pulsating frequencies and amplitudes via a control volume-based CFD solver. The nanoparticle volume fraction and the other parameters are kept constant. The flow develops both thermally and hydrodynamically while the corrugated-channel walls are kept at a constant temperature. The results indicate a good potential in promoting the thermal performance enhancement by using the nanoparticles under pulsating flow. Because of the flow periodicity, the secondary flow structures occur in the corrugated walls, and improve the mixture between hot and cold fluids. Furthermore, the pulsating flow has the advantage of preventing the sedimentation of nanoparticles in the base fluid. A comparison is presented between the heat transfer coefficients for nanofluids under steady flow conditions and the existing results. The use of nanoparticles under the pulsating flow conditions increases the heat transfer rate compared with the steady flow case. The obtained results are given as a function of dimensionless parameters.
Açıklama
Anahtar Kelimeler
Nanofluids, Pulsating Flow, Corrugated-Channel, Heat Transfer Enhancement
Kaynak
Progress in Computational Fluıd Dynamics
WoS Q Değeri
N/A
Scopus Q Değeri
Q4
Cilt
17
Sayı
5
