Pressure effects on the buoyancy-induced convective heat transfer for non-Boussinesq fluid in a rectangular enclosure

Kuo Shu Hung, Chin-Hsiang Cheng

Research output: Contribution to journalArticle

Abstract

Numerical predictions of pressure effects on natural convective heat transfer characteristics for a non-Boussinesq fluid in a rectangular enclosure are presented. The solution method is developed based on a compressible flow model and is employed to simultaneously determine the absolute pressure, density, temperature, and velocity distributions in the enclosure. Discretization equations are derived from the integral mass, momentum, and energy equations on a staggered grid. The fluid pressure in the enclosure is varied from 20 to 300 kPa such that the flow behavior in a vacuum or pressurized system can be observed. Physical situations investigated also include cases in a wide range of wall temperature difference associated with various length scales, corresponding to an equivalent modified Rayleigh number ranging from 104 to 106. The validity of the incompressible flow model coupled with the Boussinesq approximation for the fluid density, which is commonly used in the existing studies of the buoyant flows, is discussed.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume369
Issue number1
Publication statusPublished - 2001

Fingerprint

Pressure effects
Buoyancy
Enclosures
Heat transfer
Fluids
Compressible flow
Incompressible flow
Velocity distribution
Momentum
Temperature distribution
Vacuum
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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