Interfacial measurements in stratified types of flow. Part II: Measurements for R-22 and R-410A

Autor:	Leszek Wojtan, Thierry Ursenbacher, John R. Thome
Rok vydání:	2004
Předmět:	Fluid Flow and Transfer Processes R-410A Void (astronomy) Materials science Mechanical Engineering Stratified flows General Physics and Astronomy Thermodynamics Mechanics chemistry.chemical_compound chemistry Boiling Two-phase flow Stratified flow Porosity Glass tube
Zdroj:	International Journal of Multiphase Flow. 30:125-137
ISSN:	0301-9322
DOI:	10.1016/j.ijmultiphaseflow.2003.11.009
Popis:	A new optical void fraction measurement system has been coupled to a flow boiling test facility to obtain dynamic and time-averaged void fractions in a horizontal tube. A series of evaporation tests have been run for two refrigerants. R-22 was tested under mass velocity conditions of 70, 100, 150 and 200 kg/m2 s and R-410A for 70, 150, 200 and 300 kg/m2 s in a 13.6 mm diameter glass tube. Using our newly developed image processing system, about 227 000 images have been analyzed in this study to provide the same number of dynamic void fraction measurements. From these images, 238 time-averaged void fraction values have been obtained for vapor qualities from 0.01 to 0.95. These experimental points show very good agreement with the horizontal version of the Rouhani–Axelsson drift flux void fraction model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ef8bea51a39f8cbe21e26461612c8718 https://doi.org/10.1016/j.ijmultiphaseflow.2003.11.009 Zobrazit plný text záznamu Full Text from ScienceDirect