CuO/WATER NANOFLUID FLOW OVER MICROSCALE BACKWARD-FACING STEP AND ANALYSIS OF HEAT TRANSFER PERFORMANCE
Küçük Resim Yok
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Begell House Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Three-dimensional numerical simulation of steady-state laminar forced convection flow of a CuO/water nanofluid and heat transfer in a duct having a microscale backward-facing step (MBFS) are presented in this study. The study was conducted for determining the effects of nanoparticle volume fraction on the flow and heat transfer characteristics. The Reynolds number ranged from 100 to 1000. The step height and inlet height of the duct were 600 mu m and 400 mu m, respectively. The duct expansion ratio was 2.5. The downstream wall was subjected to a constant and uniform heat flux, whereas the other walls were insulated. The nanoparticle volume fraction varied from 1.0% to 4.0%. The Nusselt number and Darcy friction factor were obtained for each nanoparticle volume fraction. Plots of velocity streamlines were analyzed. It was found from the results of numerical simulation that the Nusselt number increases with increasing nanoparticle volume fraction and Reynolds number. The nanoparticle volume fraction does not exert any substantial effect on the Darcy friction factor and the length of the recirculation zone. Moreover, the performance evaluation criterion (PEC) was analyzed for nanoparticle volume fractions of 1.0%, 2.0%, 3.0%, and 4.0% of CuO. It was obtained that the volume fractions of 4.0% has the highest PEC in terms of heat transfer. It was obtained that while heat transfer for nanoparticle volume fraction of 30% and 4.0% the friction factor is superior for nanoparticle volume fraction of 1.0% and 2.0% due to the PEC number.
Açıklama
Anahtar Kelimeler
laminar flow, CuO/water nanofluid, microscale backward-facing step, forced convection, flow separation, heat transfer, PEC, recirculation zone
Kaynak
Heat Transfer Research
WoS Q Değeri
Q4
Scopus Q Değeri
Cilt
49
Sayı
15
