An experimental study of convective flow in a bottom heated cavity with ventilation duct-Laboratory modeling of convective flow in under coal gasification cavity

被引：3

作者：

Song, Chang ^{[1
]}

Chen, Shanshan ^{[2
]}

Chen, Yanpeng ^{[2
]}

Dong, Zhen ^{[2
]}

Zhang, Xun ^{[3
]}

Nie, Bingchuan ^{[1
]}

Xu, Feng ^{[1
]}

机构：

[1] Beijing Jiaotong Univ, Sch Phys Sci & Engn, Beijing 100044, Peoples R China

[2] Petro China, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China

[3] Minist Sci & Technol Peoples Republ China, High Technol Res & Dev Ctr, Beijing 100044, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2023年 / 206卷

基金：

中国国家自然科学基金;

关键词：

Convective flow; Jet; Plume; Cavity; Underground coal gasification; Flow visualization; Temperature measurement; NATURAL-CONVECTION; STARTING PLUME; AIR-FLOW; STABILITY; DRIVEN; INSTABILITY; REGIMES; ENERGY;

D O I：

10.1016/j.ijheatmasstransfer.2023.123967

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Convective flow in a bottom heated cavity with a ventilation duct is experimentally investigated using flow visualization and temperature measurement. Flow visualization reveals that convective flow in the cavity is dominated by natural convection on the bottom wall or mixed convection of the air jet from the duct and the plume on the bottom wall. Convective flow by natural convection does have a transition from symmetrical steady to unsteady states with an increase of the Rayleigh number (Ra), and even be-comes chaotic if the Rayleigh number is sufficiently large for e.g., Ra = 3 x 10 6 . Additionally, convective flow by mixed convection is characterized under different flow regimes, which are determined by the Rayleigh number and Reynolds number ( Re ). The dependence of the horizontal velocity above the bot-tom wall on the Rayleigh number and Reynolds number is quantified. Further, heat transfer by natural convection and mixed convection has been described in which the relationship between Nu and Ra is obtained.(c) 2023 Elsevier Ltd. All rights reserved.

引用

页数：11

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