Influence of concentration and additives on R123/paraffinic material oil boiling heat transfer performance / / Mark A. Kedzierski, D.H. Han

• Autore: Kedzierski Mark A
• Pubblicazione: [Gaithersburg, MD] : , : U.S. Dept. of Commerce, National Institute of Standards and Technology, , [2006]
• Descrizione fisica: 1 online resource (42 pages) : illustrations
• Soggetto topico: Heat - Transmission; Lubrication and lubricants
• Altri autori: HanD. H
• Note generali: "September 2006."; Contributed record: Metadata reviewed, not verified. Some fields updated by batch processes.; Title from page [1], viewed March 5, 2007.
• Nota di bibliografia: Includes bibliographical references (page 12).
• Sommario/riassunto: 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.
• Titolo autorizzato: Influence of concentration and additives on R123
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Lingua di pubblicazione: Inglese
• Record Nr.: 9910714186103321
• Lo trovi qui: Univ. Federico II