Towards understanding the development and characteristics of under-expanded flash boiling jets

Guo, Hengjie; Nocivelli, Lorenzo; Torelli, Roberto; Som, Sibendu

doi:10.1016/j.ijmultiphaseflow.2020.103315

Towards understanding the development and characteristics of under-expanded flash boiling jets

Journal Article · Thu May 07 00:00:00 EDT 2020 · International Journal of Multiphase Flow

DOI:https://doi.org/10.1016/j.ijmultiphaseflow.2020.103315· OSTI ID:1659111

Guo, Hengjie ^[1]; Nocivelli, Lorenzo ^[1]; Torelli, Roberto ^[1]; Som, Sibendu ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States)

Here in this research, the n-hexane jets discharged from a straight channel were studied numerically to reveal the development and characteristics of under-expanded flashing jets. Firstly, the development of flash boiling jets was investigated and compared to that of two-phase jets without phase transition. It was shown that the two-phase jets without phase transition can be under-expanded only if the flow is choked. In contrast, flash boiling jets can be under-expanded whether or not the choked conditions are verified. Secondly, the factors affecting the flashing jet behaviors were discussed. The relaxation time in phase transition, the expansion ratio, and the injection pressure have been identified as three key factors determining the jet characteristics. With high enough expansion ratio and low enough relaxation time, the expansion was so strong that the flow became transonic and shock structures similar to those of under-expanded gaseous jets appeared near the orifice exit. Finally, two types of choking have been identified for flash boiling jets, i.e., vaporization-induced choking and expansion-induced choking. The former one is mainly ascribed to the vapor formation in the orifice which reduces the local speed of sound, while the latter one is due to the expansion of under-expanded two-phase flow and the resultant flow acceleration.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1659111

Alternate ID(s):: OSTI ID: 1809918

Journal Information:: International Journal of Multiphase Flow, Journal Name: International Journal of Multiphase Flow Vol. 129; ISSN 0301-9322

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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expansion ratio
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