Conjugated Heat Transfer in Microchannels

  • J. S. Nunes
  • R. M. Cotta
  • M. R. Avelino
  • S. Kakaç
Conference paper
Part of the NATO Science for Peace and Security Series A: Chemistry and Biology book series (NAPSA)

Abstract

Energy conservation and sustainable development demands have been driving research efforts, within the scope of thermal engineering, towards more energy efficient equipments and processes. In this context, the scale reduction in mechanical fabrication has been permitting the miniaturization of thermal devices, such as in the case of micro-heat exchangers [1]. More recently, heat exchangers employing micro-channels with characteristic dimensions below 500 μm have been calling the attention of researchers and practitioners, towards applications that require high heat removal demands and/or space and weight limitations [2]. Recent review works [2, 3] have pointed out discrepancies between experimental results and classical cor-relation predictions of heat transfer coefficients in micro-channels. Such deviations have been stimulating theoretical research efforts towards a better agreement between experiments and simulations, through the incorporation of different effects that are either typically present in micro-scale heat transfer or are effects that are normally disregarded at the macro-scale and might have been erroneously not accounted for in micro-channels. Our own research effort was first related to the fundamental analysis of forced convection within micro-channels with and without slip flow, as required for the design of micro-heat exchangers in steady, periodic and transient regimen [4, 5]. Also recently in Refs. [6–11], the analytical contributions were directed towards more general problem formulations, including viscous dissipation, axial diffusion in the fluid and three-dimensional flow geometries. Then, this fundamental research was extended to include the effects of axial fluid heat conduction and wall corrugation or roughness on heat transfer enhancement [12]. The work of Maranzana et al. [13] further motivated the present analysis, dealing with longitudinal wall heat conduction effects in symmetric micro-channels.

Keywords

Nusselt Number Wall Temperature Forced Convection Heat Transfer Enhancement Local Nusselt Number 
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.

Notes

Acknowledgements

The authors would like to acknowledge the financial support provided by CNPq, Brasil, RJ.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • J. S. Nunes
    • 1
    • 2
  • R. M. Cotta
    • 1
  • M. R. Avelino
    • 3
  • S. Kakaç
    • 4
  1. 1.Laboratory of Transmission and Technology of Heat, LTTC Mechanical Engineering Department, COPPE & POLIUniversidade Federal do Rio de JaneiroRio de JaneiroBrasil
  2. 2.INPIRio de JaneiroBrasil
  3. 3.Universidade do Estado do Rio de Janeiro, UERJRio de JaneiroBrasil
  4. 4.TOBB University of Economics & TechnologyAnkaraTurkey

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