Commenced in January 2007
Paper Count: 31824
Mixed Convection in a 2D-channel with a Co- Flowing Fluid Injection: Influence of the Jet Position
Abstract:Numerical study of a plane jet occurring in a vertical heated channel is carried out. The aim is to explore the influence of the forced flow, issued from a flat nozzle located in the entry section of a channel, on the up-going fluid along the channel walls. The Reynolds number based on the nozzle width and the jet velocity ranges between 3 103 and 2.104; whereas, the Grashof number based on the channel length and the wall temperature difference is 2.57 1010. Computations are established for a symmetrically heated channel and various nozzle positions. The system of governing equations is solved with a finite volumes method. The obtained results show that the jet-wall interactions activate the heat transfer, the position variation modifies the heat transfer especially for low Reynolds numbers: the heat transfer is enhanced for the adjacent wall; however it is decreased for the opposite one. The numerical velocity and temperature fields are post-processed to compute the quantities of engineering interest such as the induced mass flow rate, and the Nusselt number along the plates.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1061320Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1609
 O. Manca, B. Morrone, S. Nardini, V. Naso, Natural convection in open channels, in: B. Sunden, G. Comini (Eds.), Computational Analysis of Convection Heat Transfer, WIT Press, Southampton, UK, 2000, pp. 235- 278.
 S.J. Kim, S.W. Lee, Air Cooling Technology for Electronic Equipment, CRC Press, Boca Raton, FL, 1996.
 A. Bejan, Shape and Structure from Engineering to Nature, Cambridge University Press, New York, 2000.
 G.A. Ledezma, A. Bejan, Optimal geometric arrangement of staggered vertical plates in natural convection, ASME J. Heat Transfer 119 (1997) 700-708.
 S. Sathe, B. Sammakia, A review of recent developments in some practical aspects of air-cooled electronic packages, ASME J. Heat Transfer 120 (1998) 830-839.
 A. Bejan, A.K. da Silva, S. Lorente, Maximal heat transfer density in vertical morphing channels with natural convection, Numer. Heat Transfer A 45 (2004) 135-152.
 A. Auletta, O.Manca, B. Morrone, V. Naso, Heat transfer enhancement by the chimney effect in a vertical isoflux channel, Int. J. Heat Mass Transfer 44 (2001) 4345-4357.
 A.K. da Silva, L. Gosselin, Optimal geometry of L- and C-shaped channels for maximum heat transfer rate in natural convection, Int. J. Heat Mass Transfer 48 (2005) 609-620.
 A. Andreozzi, A. Campo, O. Manca, Compounded natural convection enhancement in a vertical parallel-plate channel, Int. J. Thermal Sciences 47 (6) (2008) 742-748.
 W.B. Hall, J.D. Jackson, Laminarization of a turbulent pipe flow by buoyancy forces, ASME paper, ASME paper no. 69-HT-55 (1969).
 J.D. Jackson, W.B. Hall, Influence of buoyancy on heat transfer to fluids flowing in vertical tubes under turbulent conditions, in: S. Kakac, D.B. Spalding (Eds.), Turbulent Forced Convection in Channels and Bundles,Hemisphere Publishing, USA, 1979, pp. 613-640.
 Jiulei Wang, Jiankang Li, J.D. Jackson, A study of the influence of buoyancy on turbulent flow in a vertical plane passage, Int. J. Heat Fluid Flow 25 (2004) 420-430.
 K. Nakajima, K. Fukui, H. Ueda, T. Mizushina, Buoyancy effects on turbulent transport in combined free and forced convection between verticalparallel plates, Int. J. Heat Mass Transfer 23 (1980) 1325-1336.
 M. Miyamoto, Y. Katoh, J. Kurima, H. Saki, Turbulent free convection heat transfer from vertical parallel plates. In Heat Transfer, Vol. 4. (eds C. L. Tien, V. P.Carey and J. K. Ferrell) Hemisphere, Washington DC, 1986, pp. 1593- l598.
 A. Auletta, O. Manca, Heat and fluid flow resulting from the chimney effect in a symmetrically heated vertical channel with adiabatic extensions, International Journal of Thermal Sciences, 41 (2002), pp. 1101-1111.
 A.G. Fedorov and R.Vskanta, Turbulent natural convection heat transfer in an asymmetrically heated vertical parallel plate channel; International Journal of Heat Mass Transfer, 40 (1997), 16, pp. 3849-3860.
 T.A.M. Versteegh, F.T.M. Nieuwstadt., Turbulent budgets of natural convection in an infinite, differentially heated, vertical channel. International Journal of Heat and Fluid Flow, 19 (1998), pp.135-149.
 T.A.M. Versteegh, F.T.M. Nieuwstadt., A direct numerical simulation of natural convection between two infinite vertical differentially heated walls scaling laws and wall functions, International Journal of Heat and Mass Transfer, 42 (1999), pp.3673-3693.
 A.M. Dalbert, F.Penot, JL.Peube, convection naturelle laminaire dans un canal vertical chauffé ├á flux constant, International Journal of Heat and Mass Transfer, 24 (1981), 9, pp. 1463-1473.
 F. Penot, A.M.Dalbert, convection naturelle mixte et forcée dans un thermosiphon vertical chauffé ├á flux constant, International Journal of Heat and Mass Transfer,.26 (1983), 11, pp. 1639-1647.
 M. Najam, M. El Almi, M. Hasnaoui, A. Amahamid, Etude numérique de la convection mixte dans une cavité en forme de T soumis ├á un flux de chaleur constant et ventilé par le bas ├á l-aide d- un jet d-air vertical, Compte Rendu de Mecanique 330 (2002) 461-467.
 A. Auletta, O. Manca, Heat and fluid flow resulting from the chimney effect in a symmetrically heated vertical channel with adiabatic extensions, International Journal of Thermal Sciences 41 (2002) 1101- 1111