THERMAL SCIENCE

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Premium jet cooling with two ribs over flat plate utilizing nanofluid mixed convection

ABSTRACT
In this current study, a numerical simulation of the thermal performance of two ribs mounted over a horizontal flat plate and cooled by Cu-water nanofluid is performed. The plate is heated and maintained at a constant temperature and cooled by mixed convection of laminar flow at a relatively low temperature. The top wall is considered as an adiabatic condition. The effects of related parameters such as Richardson number (0.01≤ Ri ≤ 10), the solid volume fraction (0.01 ≤ ϕ ≤ 0.06), the distance ratio between the two ribs (d/W=5, 10, 15) and the rib height ratio (b/W=1, 2, 3) on the ribs thermal performance are studied. The numerical simulation results indicate that the heat transfer rate is significantly affected by the distance and the rib height. The heat transfer rate is improved by increasing the nano- particles volume fraction. The influence of the solid volume fraction with the increase of heat transfer is more noticeable for lower values of the Richardson number. The numerical results are summarized in the effect of pertinent parameters on the average Nusselt number with the assistance of both streamlines and isothermal ones. Throughout the study, the Grashof and Prandtl numbers, for pure water are kept constant at 103 and 6.2 respectively. The numerical work was displayed out using, an in-house CFD code written in FORTRAN, which discretizes non-dimensional forms of the governing equations using the finite volume method and solves the resulting system of equations using Gauss-Seidal method utilizing a TDMA algorithm.
KEYWORDS
PAPER SUBMITTED: 2014-12-28
PAPER REVISED: 2015-03-09
PAPER ACCEPTED: 2015-04-03
PUBLISHED ONLINE: 2015-05-03
DOI REFERENCE: https://doi.org/10.2298/TSCI141228056E
REFERENCES
  1. Maghrebi, M., Armaghani, T., Talebi, F., effects of nanoparticle volume fraction in hydrodynamic and thermal characteristics of forced plane jet, Thermal Science, 16 (2012) PP. 455-468
  2. Abdel-Fattah, A., Numerical and experimental study of turbulent impinging twin-jet flow, Experimental Thermal, and Fluid Science, 31 (2007) PP.1061-1072
  3. Baydar, E., Confined impinging air jet at low Reynolds numbers, Experimental Thermal and Fluid Science, 19 (1999) PP. 27-33
  4. Baydar, E., Ozmen, Y., An experimental and numerical investigation on a confined impinging air jet at high Reynolds numbers, Applied Thermal Engineering, 25 (2005) PP. 409-421
  5. Cavadas, A.S., Pinho, F.T., Campos, J.B.L.M., Laminar flow field in a viscous liquid impinging jet confined by inclined plane walls, International Journal of Thermal Sciences, 59 (2012a) PP. 95-110
  6. Choo, K.S., Kim, S.J., Comparison of thermal characteristics of confined and unconfined impinging jets, International Journal of Heat and Mass Transfer, 53 (2010) PP. 3366-3371
  7. Guerra, D.R.S., Su, J., Silva Freire, A.P., The near wall behavior of an impinging jet, International Journal of Heat and Mass Transfer, 48 (2005) PP. 2829-2840
  8. Koseoglu, M.F., Baskaya, S., Experimental and numerical investigation of natural convection effects on confined impinging jet heat transfer, International Journal of Heat and Mass Transfer, 52 (2009) PP. 1326-1336
  9. Lee, D.H., Bae, J.R., Park, H.J., Lee, J.S., Ligrani, P., Confined, milliscale unsteady laminar impinging slot jets and surface Nusselt numbers, International Journal of Heat and Mass Transfer, 54 (2011) PP. 2408-2418
  10. Lee, H.G., Yoon, H.S., Ha, M.Y., A numerical investigation on the fluid flow and heat transfer in the confined impinging slot jet in the low Reynolds number region for different channel heights, International Journal of Heat and Mass Transfer, 51 (2008) PP . 4055-4068
  11. Nguyen, C.T., Galanis, N., Polidori, G., Fohanno, S., Popa, C.V., Le Bechec, A., An experimental study of a confined and submerged impinging jet heat transfer using Al2O3-water nanofluid, International Journal of Thermal Sciences, 48 (2009) PP. 401-411
  12. Ozmen, Y., Confined impinging twin air jets at high Reynolds numbers, Experimental Thermal and Fluid Science, 35 (2011) PP. 355-363
  13. San, J.-Y., Chen, J.-J., Effects of jet-to-jet spacing and jet height on heat transfer characteristics of an impinging jet array, International Journal of Heat and Mass Transfer, 71 (2014) PP. 8-17
  14. San, J.-Y., Shiao, W.-Z., Effects of jet plate size and plate spacing on the stagnation Nusselt number for a confined circular air jet impinging on a flat surface, International Journal of Heat and Mass Transfer, 49 (2006) PP. 3477-3486
  15. Yousefi-Lafouraki, B., Ramiar, A., Ranjbar, A.A., Laminar forced convection of a confined slot impinging jet in a converging channel, International Journal of Thermal Sciences, 77 (2014) PP. 130-138
  16. Zukowski, M., Heat transfer performance of a confined single slot jet of air impinging on a flat surface, International Journal of Heat and Mass Transfer, 57 (2013) PP. 484-490
  17. Behnia, M., Parneix, S., Shabany, Y., Durbin, P.A., Numerical study of turbulent heat transfer in confined and unconfined impinging jets, International Journal of Heat and Fluid Flow, 20 (1999) PP. 1-9
  18. Beitelmal, A.H., Saad, M.A., Patel, C.D., The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet, International Journal of Heat and Fluid Flow, 21 (2000) PP. 156-163
  19. Senter, J., Solliec, C., Flow field analysis of a turbulent slot air jet impinging on a moving flat surface, International Journal of Heat and Fluid Flow, 28 (2007) PP. 708-719
  20. Yan, X., Saniei, N., Heat transfer from an obliquely impinging circular, air jet to a flat plate, International Journal of Heat and Fluid Flow, 18 (1997) PP. 591-599
  21. Dagtekin, I., Oztop, H.F., Heat transfer due to double laminar slot jets impingement onto an isothermal wall within one side closed long duct, International Communications in Heat and Mass Transfer, 35 (2008) PP. 65-75
  22. Brinkman, H.C., The viscosity of concentrated suspensions and solution, J. Chem. Phys., 20 (1952) PP. 571-581
  23. Patel, H.E., Sundararajan, T., Pradeep, T., Dasgupta, A., Dasgupta, N., Das, S.K., A micro-convection model for thermal conductivity of nanofluids, Pramana, J. Phys., 65 (2005) PP. 863-869
  24. Santra, A.K., Sen, S., Chakraborty, N., Study of heat transfer due to laminar flow of copper-water nanofluid through two isothermally heated parallel plates, Int. J. Therm. Sci., 48 (2009) PP. 391-400
  25. Patankar, S., Numerical Heat Transfer and Fluid Flow, (1980), McGraw-Hill, New York