Heat transfer enhancement from a vertical, isothermal channel generated by the chimney effect

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Original languageEnglish
Pages (from-to)395-402
Journal / PublicationJournal of Heat Transfer
Issue number2
Publication statusPublished - May 1993
Externally publishedYes


A numerical and experimental investigation of free convection from vertical, isothermal, parallel-walled channels has been undertaken to explore the heat transfer enhancement obtained by adding adiabatic extensions of various sizes and shapes. Investigations were carried out for air (Pr= 0.7) over a wide range of wall heating conditions. In all cases, the adiabatic extensions were able to increase heat transfer. The increase varied from 2.5 at low Ra* to 1.5 at high Ra*. The experimental and numerical results are in excellent agreement. A single correlation accounting for the channel aspect ratio Lh/b, expansion ratio, B/b, modified Rayleigh number, Ra* and heated length ratio, Lh/L is presented. © 1993 by ASME.

Research Area(s)

  • Augmentation and Enhancement, Natural Convection

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