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Concluding Remarks and Future Work

  • Marcelo J. S. de Lemos
Chapter
Part of the SpringerBriefs in Applied Sciences and Technology book series (BRIEFSAPPLSCIENCES)

Abstract

This book investigated the influence of the presence of a porous layer covering a surface where a jet collides. This work reviewed and compiled a systematic study on impinging jets on bare and covered walls, which was carried out in the last few years at ITA, Brazil, and considered both laminar [Graminho and de Lemos (Numer Heat Transf Part A Appl 54(2):151–177, 2008), de Lemos and Fischer (Numer Heat Transf Part A Appl 54:1022–1041, 2008), Dórea and de Lemos (Inter J Heat Mass Transf 53:5089–5101, 2010)] and turbulent flow regimes [Graminho and de Lemos (Inter J Heat Mass Transf 52:680–693, 2009), Fischer and de Lemos (Numer Heat Transf Part A Appl 58:429–456, 2010), de Lemos and Dórea (Numer Heat Transf Part A Appl 59(10):769–798, 2011)]. By that, a self-contained text was put together in order to convey to the interested reader the major steps and results achieved on such research topic. Two energy modes were applied, namely 1EEM and 2EEM, based respectively on the Local Thermal Equilibrium (LTE) and Local Thermal Non-Equilibrium hypotheses (LNTE). It was observed that the Reynolds number and porosity strongly influences the stagnation Nusselt value while the porous layer thickness affects more intensely the distribution of Nu along the plate. Cases with low porosity and highly permeable layers of porous material tend to yield better heat absorption/release rates when compared with a bare wall case. Regardless of the model used, increasing the thermal conductivity ratio is always beneficial to heat transfer enhancement form the hot wall. Ultimately, results in this work might be useful to engineers designing systems that make use of impinging jets over thermally conducting porous materials.

Keywords

Reynolds Number Porous Material Energy Mode Porous Layer Heat Transfer Enhancement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    D.R. Graminho, M.J.S. de Lemos, Laminar confined impinging jet into a porous layer. Numer. Heat Transf. Part A Appl. 54(2), 151–177 (2008)Google Scholar
  2. 2.
    M.J.S. de Lemos, C. Fischer, Thermal analysis of an impinging jet on a plate with and without a porous layer. Numer. Heat Transf. Part A Appl. 54, 1022–1041 (2008)Google Scholar
  3. 3.
    F.T. Dórea, M.J.S. de Lemos, Simulation of laminar impinging jet on a porous medium with a thermal non-equilibrium model. Int. J. Heat Mass Transf. 53, 5089–5101 (2010)Google Scholar
  4. 4.
    D.R. Graminho, M.J.S. de Lemos, Simulation of turbulent impinging jet into a cylindrical chamber with and without a porous layer at the bottom. Int. J. Heat Mass Transf. 52, 680–693 (2009)Google Scholar
  5. 5.
    C. Fischer, M.J.S. de Lemos, A turbulent impinging jet on a plate covered with a porous layer. Numer. Heat Transf. Part A Appl. 58, 429–456 (2010)Google Scholar
  6. 6.
    M.J.S. de Lemos, F.T. Dórea, Simulation of turbulent impinging jet into a layer of porous material using a two-energy equation model. Numer. Heat Transf. Part A Appl. 59(10), 769–798 (2011)Google Scholar

Copyright information

© The Author(s) 2012

Authors and Affiliations

  • Marcelo J. S. de Lemos
    • 1
  1. 1.Departamento de Energia—IEMEInstituto Tecnólogico de AeronáuticaSão José dos CamposBrazil

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