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A NUMERICAL INVESTIGATION OF PHASE CHANGE EFFECTS IN POROUS MATERIALS.

Author(s) : VAFAI K., TIEN H. C.

Type of article: Article

Summary

THE PROBLEM IS MODELLED BY A SYSTEM OF TRANSIENT INTER-COUPLED EQUATIONS GOVERNING THE TWO-DIMENSIONAL MULTIPHASE TRANSPORT PROCESS INPOROUS MEDIA. THE SOLUTION ALGORITHM ALLOWS FULL SIMULATION. THE VARIATIONS AND THE INTERRELATIONSHIP BETWEEN THE TEMPERATURE, VAPOUR DENSITY, CONDENSATION RATE, LIQUID CONTENT AND THE FLUID VELOCITY FIELDS ARE DEMONSTRATED AND DISCUSSED. THE ASPECT RATIO OF THE POROUS MATRIX DOES NOT HAVE A SIGNIFICANT EFFECT ON THE NUSSELT NUMBER RESULTS. FURTHERMORE, THE ONE-DIMENSIONAL MODEL IS NOT VALID WHEN THE BOUNDARIES OF THE POROUS MATRIX ARE SUBJECTED TO A SMALL OR ZERO PRESSURE DIFFERENCE AND THE CONSTANT PRESSURE SIMPLIFICATION WOULD GENERATE SIGNIFICANT ERRORS UNDER SOME CIRCUMSTANCES. THE ANALYSIS CAN BE APPLIED TO A CLASS OF PROBLEMS ON HEAT AND MASS TRANSPORT WITH PHASE CHANGE THROUGH A POROUS MEDIUM.

Details

  • Original title: A NUMERICAL INVESTIGATION OF PHASE CHANGE EFFECTS IN POROUS MATERIALS.
  • Record ID : 1990-0997
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 32 - n. 7
  • Publication date: 1989/07

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