20.500.12556/RUL-113666 Investigation of the scatter in reported pool boiling CHF measurements including analysis of heat flux and measurement uncertainty evaluation methodology This study investigates the effect of experimental setup design factors on pool boiling CHF, compares spatial temperature gradient calculation methods and analyzes the uncertainty of heat flux and surface superheat. Reported CHF values on smooth copper surfaces, measured for saturated pool boiling of water at atmospheric pressure on flat horizontal samples, are highly scattered, which cannot be explained solely by the measurement uncertainty or the randomness of the boiling process. CHF data for 54 experiments from 47 publications is analyzed using regression analysis and ANOVA to determine which experimental setup design factors influence the CHF value. Methods for estimating the axial temperature gradient in a heating stem are compared using the Monte Carlo method and analytical nonlinear gradients. Heat flux values calculated using temperature measurements in a cylindrical copper heating stem together with either constant or temperature-dependent thermal conductivity and various temperature gradient calculation methods are compared. Overall heat flux and surface superheat measurement uncertainties are analyzed and the impact of contributing uncertainties including that of the thermal conductivity, temperature measurement and distance between thermocouples is reported. critical heat flux pool boiling nucleate boiling measurement uncertainty heat flux measurement kritična gostota toplotnega toka vrenje v bazenu mehurčkasto vrenje merilna negotovost meritev gostote toplotnega toka true false true Angleški jezik Slovenski jezik Članek v reviji 2020-01-22 10:50:19 2020-01-22 10:50:24 2023-11-29 09:15:45 0000-00-00 00:00:00 2020 0 0 18 str. art. 114938 Vol. 169 Mar. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.021.4:66.046.7 (045) 1359-4311 10.1016/j.applthermaleng.2020.114938 17016091 1861910 RAZ_Moze_Matic_2020.pdf RAZ_Moze_Matic_2020.pdf 1 7AED391A4170AD0B9C3DED04B728282C 6a17fc3e12dee1d24dcef6b090e622512eb6613c1ebdc98f9cb74c1b3c1b6aa0 2241860a-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=125762 https://www.sciencedirect.com/science/article/pii/S1359431119359459 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=125761 Fakulteta za strojništvo 0 0 0