A CFD INVESTIGATION OF Al 2 O 3 /WATER FLOW IN A DUCT HAVING BACKWARD-FACING STEP

Al 2 O 3 /water forced convection nanofluid flow was numerically studied in a duct with backward-facingstep. Nanoparticle volume fraction was changed between 1%-5%. Diameter of nanoparticle was constant (d p =40nm). The Reynolds number was increased from 100 to 500. The step and total height of the duct were 4.8 mmand 9.6 mm, respectively. The bottom wall, which was positioned after the step, was heated with 2000 W/m 2 andthe rest of the walls were adiabatic. Nusselt number, velocity profiles and friction factor were investigated indetail. It was obtained that Nusselt number increases with increasing nanoparticle volume fraction and Reynoldsnumber.

PDF

___

Goldstein, R. J., Eriksen, V. L., Olson, R. M., & Eckert, E. R. G. (1970). Laminar separation, reattachment, and transition of the flow over a downstream-facing step. Journal of Basic Engineering, 92(4), 732-739.
Denham, M. K., Patrick, M. A. (1974). Laminar flow over a downstream-facing step in a two-dimensional flow channel. Transactions of the American Institute of Chemical Engineers 52(4), 361-367.
Rinoie, K., Shirai, Y., Saitao, Y., Sunada, Y. (1998) Behaviours of separated and reattaching flow formed over backward-facing step. 21st ICAS Congress.
Nie, J. H., Armaly, B. F. (2002). Three-dimensional convective flow adjacent to backward-facing step-effects of step height. International journal of heat and mass transfer, 45(12), 2431-2438.
Lan, H., Armaly, B. F., Drallmeier, J. A. (2009). Three-dimensional simulation of turbulent forced convection in a duct with backward-facing step. International Journal of Heat and Mass Transfer, 52(7-8), 1690- 1700.
Abu-Nada, E. (2008). Application of nanofluids for heat transfer enhancement of separated flows encountered in a backward facing step. International Journal of Heat and Fluid Flow, 29(1), 242-249.
Al-Aswadi, A. A., Mohammed, H. A., Shuaib, N. H., Campo, A. (2010). Laminar forced convection flow over a backward facing step using nanofluids. International Communications in Heat and Mass Transfer, 37(8), 950-957.
Ekiciler, R., Arslan, K. (2016) Numerical analysis of SiO 2 /water nanofluid flow over backward facing step. International Conference of Engineering and Natural Sciences pp 331–339.
Moraveji, M. K., Darabi, M., Haddad, S. M. H., Davarnejad, R. (2011). Modeling of convective heat transfer of a nanofluid in the developing region of tube flow with computational fluid dynamics. International communications in heat and mass transfer, 38(9), 1291-1295.
Salman, B. H., Mohammed, H. A., Kherbeet, A. S. (2012). Heat transfer enhancement of nanofluids flow in microtube with constant heat flux. International Communications in Heat and Mass Transfer, 39(8), 1195-1204.
Vajjha, R. S., Das, D. K. (2009). Experimental determination of thermal conductivity of three nanofluids and development of new correlations. International Journal of Heat and Mass Transfer, 52(21-22), 4675-4682.
Ghasemi, B., & Aminossadati, S. M. (2010). Brownian motion of nanoparticles in a triangular enclosure with natural convection. International Journal of Thermal Sciences, 49(6), 931-940.
Corcione, M. (2010). Heat transfer features of buoyancy-driven nanofluids inside rectangular enclosures differentially heated at the sidewalls. International Journal of Thermal Sciences, 49(9), 1536-1546.
Ekiciler, R., & Arslan, K. (2018). CuO/Water Nanofluid Flow over Microscale Backward-Facing Step and Analysis of Heat Transfer Performance. Heat Transfer Research, 49(15).

Başlangıç: 2015
Yayıncı: YILDIZ TEKNİK ÜNİVERSİTESİ

Arşiv