A computational and experimental investigation of the human thermal plume
A computational and experimental investigation of the human thermal plume
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DOI：
10.1115/1.2353274
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发表时间：
2006-11-01
影响因子：
2
通讯作者：
Settles, Gary S.
中科院分区：
文献类型：
--
作者：
Craven, Brent A.;Settles, Gary S.
人类在室内环境中排出的浮力羽流行为对于房间通风要求、空气传播疾病传播、空气污染控制、室内空气质量和建筑居住者的热舒适度非常重要。它也成为手术室和洁净室等特殊环境中的关键因素。在之前的人类热羽流研究中，很少有人使用实际的人类志愿者，进行定量的羽流速度测量，或考虑环境的热分层。在此，提出了对标准房间环境中的人体热羽流（包括中等热分层）的研究。我们使用粒子图像测速 (PIV) 来表征温度分层房间中人类志愿者周围的速度场。然后将这些结果与使用 RNG k-epsilon 二方程湍流模型从雷诺平均纳维-斯托克斯方程 (RANS) 的稳定三维计算流体动力学 (CFD) 解获得的结果进行比较。尽管 CFD 模拟采用高度简化的人体模型，但它在羽流中心线速度分布、速度剖面和流速方面与 PIV 数据的比较相当好。通过将分层结果与均匀温度房间中额外的 CFD 羽流模拟的结果进行比较，检查热室分层对人体羽流的影响。给出了由此产生的中心线速度分布和羽流流速。室温分层产生的羽流浮力的降低对羽流行为有显着影响。
The behavior of the buoyant plume of air shed by a human being in an indoor environment is important to room ventilation requirements, airborne disease spread, air pollution control, indoor air quality, and the thermal comfort of building occupants. It also becomes a critical factor in special environments like surgery rooms and clean-rooms. Of the previous human thermal plume studies, few have used actual human volunteers, made quantitative plume velocity measurements, or considered thermal stratification of the environment. Here, a study of the human thermal plume in a standard room environment, including moderate thermal stratification, is presented. We characterize the velocity field around a human volunteer in a temperature-stratified room using particle image velocimetry (PIV). These results are then compared to those obtained from a steady three-dimensional computational fluid dynamics (CFD) solution of the Reynolds-averaged Navier-Stokes equations (RANS) using the RNG k-epsilon two-equation turbulence model. Although the CFD simulation employs a highly simplified model of the human form, it nonetheless compares quite well with the PIV data in terms of the plume centerline velocity distribution, velocity profiles, and flow rates. The effect of thermal room stratification on the human plume is examined by comparing the stratified results with those of an additional CFD plume simulation in a uniform-temperature room. The resulting centerline velocity distribution and plume flow rates are presented. The reduction in plume buoyancy produced by room temperature stratification has a significant effect on plume behavior.