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The Prandtl number effect on the optimum heating frequency of an enclosure filled with fluid or with a saturated porous medium.

Author(s) : ANTOHE B. V., LAGE J. L.

Type of article: Article

Summary

This is a fundamental study of the Prandtl number effect on the natural convection flow within an enclosure subjected to intermittent heating from the side. The results presented here test the validity of the theory for estimating the resonance frequency of systems with different Prandtl number. Numerical simulations confirm the existence of a preferred (resonance) heat pulsating frequency that compares well with the theoretical estimates. They also indicate that natural convection resonance is smoothed (damped), for the same Rayleigh number and the same Darcy number (in the case of a porous medium), when the Prandtl number increases or decreases from the value Prandtl number about 1. Analysis of the theoretical model, in line with the numerical results, indicates that the resonance frequency of a fluid or a porous medium system varies with Prandlt number.

Details

  • Original title: The Prandtl number effect on the optimum heating frequency of an enclosure filled with fluid or with a saturated porous medium.
  • Record ID : 1998-0152
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 40 - n. 6
  • Publication date: 1997/04

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