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Investigation of the scatter in reported pool boiling CHF measurements including analysis of heat flux and measurement uncertainty evaluation methodology
Može, Matic (Avtor), Zupančič, Matevž (Avtor), Golobič, Iztok (Avtor)

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Izvleček
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.

Jezik:Angleški jezik
Ključne besede:critical heat flux, pool boiling, nucleate boiling, measurement uncertainty, heat flux measurement
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2020
Št. strani:str. 1-18
Številčenje:Vol. 169
UDK:66.021.4:66.046.7 (045)
ISSN pri članku:1359-4311
DOI:10.1016/j.applthermaleng.2020.114938 Povezava se odpre v novem oknu
COBISS.SI-ID:17016091 Povezava se odpre v novem oknu
Število ogledov:139
Število prenosov:143
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Gradivo je del revije

Naslov:Applied Thermal Engineering
Skrajšan naslov:Appl. therm. eng.
Založnik:Elsevier Science
ISSN:1359-4311
COBISS.SI-ID:1861910 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Program financ.:Programska skupina
Številka projekta:P2-0223
Naslov:Prenos toplote in snovi

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:kritična gostota toplotnega toka, vrenje v bazenu, mehurčkasto vrenje, merilna negotovost, meritev gostote toplotnega toka

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