TY - JOUR
T1 - Formation and evolution characteristics of hydrothermal flames inside a transpiring wall reactor: A transient numerical investigation
AU - Liang, Zhaojian
AU - Zhang, Fengming
AU - Li, Mengying
AU - Ma, Chunyuan
N1 - Funding Information:
This work is partially supported by National Natural Science Foundation, China (NO. 51706049 ), Youth Innovation Promotion Association CAS, China (NO. 2017412 ), Guangdong Basic and Applied Basic Research Foundation, China (NO. 2021A1515010489 ), Guangzhou Science and Technology Projects, China (NO. 202102080627 ), and Nansha District Science and technology project, China (NO. 2021ms016 ), China.
Funding Information:
Fengming Zhang reports financial support was provided by National Natural Science Foundation of China. Fengming Zhang reports financial support was provided by Youth Innovation Promotion Association CAS. Fengming Zhang reports financial support was provided by Guangdong Basic and Applied Basic Research Foundation. Fengming Zhang reports financial support was provided by Guangzhou Science and Technology Projects. Fengming Zhang reports financial support was provided by Nansha District Science and technology project.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/9
Y1 - 2022/9
N2 - Transpiring-wall reactors with hydrothermal flames are effective in preventing corrosion and salt deposition in supercritical water oxidation systems. To uncover the not-well-understood evolution characteristics of the hydrothermal flame surrounded by a transpiring water film, a 2-D unsteady simulation is firstly conducted in this study. The transient results show that the variations of flow fields and flame shapes are attributed to the competition between inertial forces and buoyant forces. And the quasi-steady results present that high feed concentration may damage transpiring wall and delay the evolution of hydrothermal flames. In addition, a low feed temperature or a big flow area of jet can lead to open hydrothermal flames, which adversely affect the reactor. Furthermore, Froude Number, Fr, shows effectiveness in predicting quasi-steady flame shapes. For large-Fr conditions, the inertial force outweighs the buoyant force and hence closed flames are developed; while for low-Fr cases, open flames are developed.
AB - Transpiring-wall reactors with hydrothermal flames are effective in preventing corrosion and salt deposition in supercritical water oxidation systems. To uncover the not-well-understood evolution characteristics of the hydrothermal flame surrounded by a transpiring water film, a 2-D unsteady simulation is firstly conducted in this study. The transient results show that the variations of flow fields and flame shapes are attributed to the competition between inertial forces and buoyant forces. And the quasi-steady results present that high feed concentration may damage transpiring wall and delay the evolution of hydrothermal flames. In addition, a low feed temperature or a big flow area of jet can lead to open hydrothermal flames, which adversely affect the reactor. Furthermore, Froude Number, Fr, shows effectiveness in predicting quasi-steady flame shapes. For large-Fr conditions, the inertial force outweighs the buoyant force and hence closed flames are developed; while for low-Fr cases, open flames are developed.
KW - Hydrothermal flame
KW - Negative buoyant jet
KW - Supercritical water oxidation
KW - Transient simulation
KW - Transpiring wall reactor
UR - http://www.scopus.com/inward/record.url?scp=85134570583&partnerID=8YFLogxK
U2 - 10.1016/j.supflu.2022.105692
DO - 10.1016/j.supflu.2022.105692
M3 - Journal article
AN - SCOPUS:85134570583
SN - 0896-8446
VL - 188
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
M1 - 105692
ER -