03081nam 2200541Ia 450 991071418610332120180711120939.0GOVPUB-C13-489b90561284b9ea95651b896d6f68ac(CKB)4330000001259444(OCoLC)86119043(OCoLC)994330000001259444(EXLCZ)99433000000125944420070323d2006 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierInfluence of concentration and additives on R123/paraffinic material oil boiling heat transfer performance /Mark A. Kedzierski, D.H. Han[Gaithersburg, MD] :U.S. Dept. of Commerce, National Institute of Standards and Technology,[2006].1 online resource (42 pages) illustrationsNISTIR ;7336"September 2006."Contributed record: Metadata reviewed, not verified. Some fields updated by batch processes.Title from page [1], viewed March 5, 2007.Includes bibliographical references (page 12).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.HeatTransmissionLubrication and lubricantsHeatTransmissionfastLubrication and lubricantsfastHeatTransmission.Lubrication and lubricants.HeatTransmission.Lubrication and lubricants.Kedzierski Mark A1387761Han D. H1408586Building and Fire Research Laboratory (U.S.)NBSNBSOCLCQOCLCFOCLCOOCLCQBOOK9910714186103321Influence of concentration and additives on R1233492910UNINA