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Record Nr. |
UNINA9910714186103321 |
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Autore |
Kedzierski Mark A |
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Titolo |
Influence of concentration and additives on R123/paraffinic material oil boiling heat transfer performance / / Mark A. Kedzierski, D.H. Han |
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Pubbl/distr/stampa |
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[Gaithersburg, MD] : , : U.S. Dept. of Commerce, National Institute of Standards and Technology, , [2006] |
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Descrizione fisica |
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1 online resource (42 pages) : illustrations |
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Collana |
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Altri autori (Persone) |
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Soggetti |
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Heat - Transmission |
Lubrication and lubricants |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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"September 2006." |
Contributed record: Metadata reviewed, not verified. Some fields updated by batch processes. |
Title from page [1], viewed March 5, 2007. |
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Nota di bibliografia |
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Includes bibliographical references (page 12). |
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Sommario/riassunto |
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This report investigates the effect that oil concentration had on the boiling performance of an R123/paraffinic mineral oil mixture on a roughened, horizontal flat surface. For all compositions (0.5 %, 1 %, and 2 %), the lubricant caused a heat transfer degradation relative to the heat transfer of pure R123 of between 2 % and 70 % for the range of measured heat fluxes. The heat transfer degradation was shown to increase with lubricant mass fraction. The minimum heat transfer degradation for each mixture ranged between 2 % and 12 % and occurred at approximately 20 kW/m2. For a given composition, the heat transfer degradation increased as the heat flux increased from roughly 20 kW/m2 to 90 kW/m2. In addition, the effect of two trial additives on the pool boiling heat transfer of an R123/paraffinic mineral oil mixture was examined in order to test the validity of a theory for choosing oil additives to enhance boiling performance. The verification tests were inconclusive. More research with lubricants and additives with greater differences in surface tensions is required to develop a more rigorous and quantifiable theory for designing additives that improve boiling heat transfer. |
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