Impact of human body shape on forced convection heat transfer
Impact of human body shape on forced convection heat transfer
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DOI：
10.1007/s00484-023-02461-z
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发表时间：
2023-04
影响因子：
3.2
通讯作者：
Shrisudha Viswanathan;Daniel M. Martinez;Lyle Bartels;S. S. Guddanti-S.;K. Rykaczewski
中科院分区：
文献类型：
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作者：
Shrisudha Viswanathan;Daniel M. Martinez;Lyle Bartels;S. S. Guddanti-S.;K. Rykaczewski
预测人体热舒适性和安全性需要对人体与周围环境之间的对流传热有定量的了解。到目前为止，对流传热系数的相关性只基于测量或模拟的平均身体形状的成年人。为了解决这一知识差距，在这里，我们量化了成年人的身体形状对强制对流的影响。为此，我们生成了50个三维人体网格，涵盖了美国成年人群身高和体重指数（BMI）的第1至第99百分位数变化。我们开发了一个耦合的湍流和对流传热模拟，并在0.5至2.5 m·s− 1的空气速度范围内与以前的文献进行了基准测试。我们计算了人体模型在2 m·s− 1匀速和5%湍流强度下代表性气流的总传热系数hoverall。我们发现hoverall仅在19.9和23.2 W·m−2K−1之间变化。在这个小范围内，人体模型的高度具有可忽略的影响，而BMI的增加导致悬浮球的几乎线性减小。局部系数的评估显示，这些系数也随着BMI几乎线性下降，这与局部面积成反比（即，横截面尺寸）增加。由于即使是第1百分位数和第99百分位数BMI人体模型之间存在的最显著差异也小于平均人体模型的hoverall的15%，因此可以得出结论，人体形状对对流传热的影响很小。
Predicting human thermal comfort and safety requires quantitative knowledge of the convective heat transfer between the body and its surrounding. So far, convective heat transfer coefficient correlations have been based only upon measurements or simulations of the average body shape of an adult. To address this knowledge gap, here we quantify the impact of adult human body shape on forced convection. To do this, we generated fifty three-dimensional human body meshes covering 1st to 99th percentile variation in height and body mass index (BMI) of the USA adult population. We developed a coupled turbulent flow and convective heat transfer simulation and benchmarked it in the 0.5 to 2.5 m·s−1air speed range against prior literature. We computed the overall heat transfer coefficients, hoverall, for the manikins for representative airflow with 2 m·s−1uniform speed and 5% turbulence intensity. We found that hoverallvaried only between 19.9 and 23.2 W·m−2K−1. Within this small range, the height of the manikins had negligible impact while an increase in the BMI led to a nearly linear decrease of the hoverall. Evaluation of the local coefficients revealed that those also nearly linearly decreased with BMI, which correlated to an inversely proportional local area (i.e., cross-sectional dimension) increase. Since even the most considerable difference that exists between 1st and 99th percentile BMI manikins is less than 15% of hoverallof the average manikin, it can be concluded that the impact of the human body shape on the convective heat transfer is minor.