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EXPERIMENTAL INVESTIGATION AND ANALYTICAL MODELLING OF A CLOSED TWO-PHASE THERMOSYPHON WITH IMPOSED CONVECTION BOUNDARY CONDITIONS.

Author(s) : CASAROSA C., DOBRAN F.

Type of article: Article

Summary

A CLOSED TWO-PHASE THERMOSYPHON OPERATING WITH R11 AND WITH IMPOSED CONVECTION BOUNDARY CONDITIONS AT THE HEATED AND COOLED SURFACES IS EXPERIMENTALLY INVESTIGATED AND ANALYTICALLY MODELLED WITH A LUMPED PARAMETER MODEL FOR VARYING WORKING FLUID TEMPERATURES. THE THERMOSYPHON EXHIBITS DIFFERENT OPERATIONAL MODES DEPENDING ON THE HEATING AND COOLING FLUIDS' TEMPERATURE DIFFERENCE. AN INCREASEO SMRD BEYOND THIS LIMIT THETHERMOSYPHON OPERATION REVERTS TO A DIFFERENT STEADY STATE THROUGH A TRANSIENT NON-EQUILIBRIUM PROCESS. THE NEW STEADY STATE, IDENTIFIED AS THE THERMAL BLOCKING CONDITION, PRODUCES A LOWER HEAT TRANSFER CAPACITY. A COMPARISON BETWEEN THEPREDICTED AND EXPERIMENTAL HEAT TRANSFER RATES, PRIOR AND DURING THE THERMAL BLOCKING CONDITION, DEMONSTRATES THE MODEL'S UTILITY TO PREDICT COMPLEX THERMOHYDRODYNAMIC PROCESSES IN A THERMOSYPHON.

Details

  • Original title: EXPERIMENTAL INVESTIGATION AND ANALYTICAL MODELLING OF A CLOSED TWO-PHASE THERMOSYPHON WITH IMPOSED CONVECTION BOUNDARY CONDITIONS.
  • Record ID : 1989-0892
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 31 - n. 9
  • Publication date: 1988

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