Numerical Investigation of the Unsteady Thermal Plume Around Human Body in Closed Space

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• 作者：Yulong Liu ; Zhengxian Liu ; ^{zxliu@tju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jisheng Luo
• 关键词：Human thermal plume ; Buoyancy ; Numerical simulation ; Natural convection
• 刊名：Procedia Engineering
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：121
• 期：Complete
• 页码：1919-1926
• 全文大小：1250 K

文摘

The unsteady numerical simulation was conducted to investigate the unsteady thermal plume around human body in closed space, with a relative high resolution of grid and time step. The instantaneous flow filed evolution process was successfully analyzed in detail by simulation approach. A set of time-average statistics of the velocity and the temperature of thermal plume around body were obtained, as well as the fluctuation velocity, the fluctuation temperature and other unsteady characteristics. The thickness of velocity and thermal boundary layer was confirmed in the range of 2 to 5 cm, the lower half of the flow field was stable whereas obvious fluctuation and separation were found in the upper half. According to the analysis results of power spectrum, the thermal plume around the body was mainly dominated by low frequency fluctuation flow, while obvious intermittent was also observed.