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dc.contributor.authorChen, C. A.en_US
dc.contributor.authorLin, T. F.en_US
dc.contributor.authorAli, Hafiz Muhammaden_US
dc.contributor.authorAmani, Pouriaen_US
dc.contributor.authorYan, Wei-Monen_US
dc.date.accessioned2019-04-02T06:00:26Z-
dc.date.available2019-04-02T06:00:26Z-
dc.date.issued2019-01-01en_US
dc.identifier.issn0735-1933en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.icheatmasstransfer.2018.12.012en_US
dc.identifier.urihttp://hdl.handle.net/11536/148856-
dc.description.abstractThis article aims to investigate the influence of imposed flow rate oscillation on the bubble behaviors of evaporative flow of R-134a in horizontal narrow annular ducts. Particularly, the effects of amplitudes and periods of the oscillating flow rates along with the vapor quality of the R-134a on the bubble characteristics are examined in details. Moreover, the R-134a flow photos captured at the middle axial location are presented to illustrate the shift between the annular two-phase flow pattern and the bubble nucleation at different operating conditions and time instances. The observations reveal that the imposed mass flow rate oscillation results in the fluctuation of bubble departure diameter and frequency along with the density of active nucleation sites with the same frequencies. The larger amplitudes and longer periods of the mass flow rate oscillation lead to the stronger fluctuations in bubble dynamics. Furthermore, it is found that the bubble nucleation on the heating surface is the dominant mechanism at the low vapor quality of 0.05. However, the annular two-phase flow prevails over a relatively large portion of the periodic cycle at the dryness fraction of 0.5 and over the entire cycle at the dryness fraction of 0.95. Finally, the evaporative heat transfer of R-134a subject to the flow rate oscillation is correlated as a function of the mass flow rate and the vapor quality.en_US
dc.language.isoen_USen_US
dc.subjectTime periodic evaporation flowen_US
dc.subjectR-134a refrigeranten_US
dc.subjectBubble dynamicsen_US
dc.subjectFlow rate oscillationen_US
dc.titleBubble dynamics in evaporation flow of R-134a in narrow annular ducts due to flow rate oscillationen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.icheatmasstransfer.2018.12.012en_US
dc.identifier.journalINTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFERen_US
dc.citation.volume100en_US
dc.citation.spage27en_US
dc.citation.epage34en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000458343900004en_US
dc.citation.woscount0en_US
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