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Heat transfer modeling within the microclimate between 3D human body and clothing: effects of ventilation openings and fire intensity
International Journal of Clothing Science and Technology ( IF 1.2 ) Pub Date : 2020-11-30 , DOI: 10.1108/ijcst-12-2019-0191
Miao Tian , Jun Li

Purpose

The purpose of this study is to determine the effect of ventilation openings and fire intensity on heat transfer and fluid flow within the microclimate between 3D human body and clothing.

Design/methodology/approach

On account of interaction effects of fire and ventilation openings on heat transfer process, a 3D transient computational fluid dynamics model considering the real shape of human body and clothing was developed. The model was validated by comparing heat flux history and distribution with experimental results. Heat transfer modes and fluid flow were investigated under three levels of fire intensity for the microclimate with ventilation openings and closures.

Findings

Temperature distribution on skin surface with open microclimate was heavily depended on the heat transfer through ventilation openings. Higher temperature for the clothing with confined microclimate was affected by the position and direction of flames injection. The presence of openings contributed to the greater velocity at forearms, shanks and around neck, which enhanced the convective heat transfer within microclimate. Thermal radiation was the dominant heat transfer mode within the microclimate for garment with closures. On the contrary, convective heat transfer within microclimate for clothing with openings cannot be neglected.

Practical implications

The findings provided fundamental supports for the ease and pattern design of the improved thermal protective systems, so as to realize the optimal thermal insulation of the microclimate on the garment level in the future.

Originality/value

The outcomes broaden the insights of results obtained from the mesoscale models. Different high skin temperature distribution and heat transfer modes caused by thermal environment and clothing structure provide basis for advanced thermal protective clothing design.



中文翻译:

3D 人体与衣服之间微气候内的传热建模:通风口和火灾强度的影响

目的

本研究的目的是确定通风口和火灾强度对 3D 人体和衣服之间微气候内的热传递和流体流动的影响。

设计/方法/方法

考虑到火灾和通风口对传热过程的相互作用,开发了一种考虑人体和服装真实形状的3D瞬态计算流体动力学模型。通过将热通量历史和分布与实验结果进行比较来验证该模型。针对具有通风开口和关闭的小气候,在三个火灾强度级别下研究了传热模式和流体流动。

发现

具有开放小气候的皮肤表面的温度分布在很大程度上取决于通过通风口的热传递。受火焰喷射位置和方向影响,小气候条件下服装的较高温度。开口的存在导致前臂、小腿和颈部周围的速度更快,从而增强了小气候内的对流热传递。热辐射是小气候内带闭合服装的主要传热方式。相反,对于有开口的衣服,小气候内的对流热传递不容忽视。

实际影响

研究结果为改进热防护系统的简易性和图案设计提供了基础支持,以实现未来服装层面小气候的最佳隔热。

原创性/价值

结果拓宽了从中尺度模型获得的结果的见解。由热环境和服装结构引起的不同的高皮肤温度分布和传热方式为先进的热防护服设计提供了依据。

更新日期:2020-11-30
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