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Method and means for increasing the heat transfer coefficient between a wall and boiling liquid

阅读:25发布:2022-11-01

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  • 6. A METHOD FOR PROVIDING DURABLE NUCLEATION SITES IN A METAL HEAT TRANSFER SURFACE TO BE SUBJECTED TO TEMPERATURE CYCLING IN THE HEATING OF A LIQUID DISPOSED THEREAGAINST COMPRISING THE STEPS OF: (A) FORMING SMALL MACROSCOPIC CAVITIES IN SAID SURFACE, (1) SAID CAVITIES BEING ARRANGED IN SPACED RELATIONSHIP AND SUBSTANTIALLY UNIFORMLY DISTRIBUTED OVER SAID SURFACE, (B) INTRODUCING DEPOSITS OF LOW SURFACE ENERGY MATERIAL TO PARTIALLY FILL SAID CAVITIES, (1) SAID MATERIAL BEING IN THE FORM OF THIN FILM BONDED TO THE SIDE AND BOTTOM AREA OF THE INTERIOR OF SAID CAVITIES AND HAVING A CONTACT WETTING ANGLE WITH THE LIQUID OF AT LEAST ABOUT 80* AND (C) MAINTAINING THE NON-CAVITY PORTION OF SAID SURFACE FREE OF SAID MATERIAL.
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