The flow and vortex instability of horizontal natural convection in a porous medium resulting from combined heat and mass buoyancy effects

Jang Jiin-Yuh, Chang Wen-Jeng

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

An analysis is performed to study the flow and the vortex instability of natural convection in a porous medium that results from simultaneous diffusion of heat and mass in a boundary layer adjacent to a horizontal surface. Numerical results for the Nusselt number, Sherwood number, and the neutral stability curves are presented for Lewis numbers ranging from 1 to 10 and the buoyancy ratio in the range of -0.5 to 4. For mass transfer aiding the flow, the results indicate that the Nusselt number and Sherwood number are higher than those for pure thermal convection and the flow is more susceptible to the vortex instability, while for mass transfer opposing the flow, the opposite trend is true. The critical thermal Rayleigh number is found to increase with decreasing Lewis number.

Original languageEnglish
Pages (from-to)769-777
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume31
Issue number4
DOIs
Publication statusPublished - 1988 Apr

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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