The Mechanism and the Magnitude of Flow Boiling Augmentation in Tubes with Discrete Surface Roughness Elements (III).
RAYTHEON CO BEDFORD MASS MISSILE SYSTEMS DIV
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Related to other research on the effectiveness of flow boiling heat transfer augmentation using various types of turbulators this investigation comprises a definitive study of the effect of large discrete roughness elements on heat transfer over the entire range of forced convection operation -- from single-phase to critical heat flux. It was found that such elements provide significant augmentation 5-6 times smooth tube levels at equal Reynolds number in the single-phase and partial boiling modes. However, the augmentation rapidly degrades as the developed boiling mode is entered. Critical heat flux was, in fact, lowered by 15 - 30 percent with the use of the large roughness elements. Author Modified Abstract
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