细水雾室外环境降温效果的数值模拟

王军锋; 屠欣丞; 黄继伟; 黄俏梅

doi:10.3969/j.issn.1671-7775.2009.06.012

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江苏大学学报（自然科学版） ›› 2009, Vol. 30 ›› Issue (6) : 591-595. DOI: 10.3969/j.issn.1671-7775.2009.06.012

论文

细水雾室外环境降温效果的数值模拟

作者信息 +

Numerical simulation of cooling effect by fine water mist in outdoor environment

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文章历史 +

摘要

利用CFD软件Fluent的Realizable k-ε模型和离散相模型对不同液滴粒径的细水雾室外环境降温效果进行数值模拟,模拟了夏季室外大空间环境中的细水雾弥散输运过程和传热传质特性,获得细水雾气液两相流动的流场、温度场和湿度场的分布情况,并对某工况的降温效果进行人体舒适度指数预报.模拟结果表明,小粒径液滴主要在射流的起始段和过渡段中蒸发,大粒径液滴在射流的核心区与回流区中蒸发;增大液滴直径后,细水雾的蒸发时间延长,细水雾降温效果增强,降温影响空间扩大.不同身高的人群均可以感觉到明显的降温作用;增大液滴直径后,细水雾增湿范围扩大,增湿幅度基本不变,不会造成局部环境相对湿度的明显增加;细水雾室外环境降温可以有效降低人体舒适度指数,有效改善室外环境质量.

Abstract

Numerical simulation on cooling effect by fine water mist in outdoor environment was carried out under real physical condition and the Realizable k-ε model. Discrete particle model in Fluent was used to simulate the status of fine water mist transportation and the characteristics of heat and mass transfer in outdoor environment. The flow,temperature and humidity fields were simulated. In addition,the human comfort index of cooling effect was predicted. The simulation results show that the evaporation of small size droplets takes place in the zone of flow establishment and transition,and the evaporation of large size droplets occurs in the back flow zone. With the increasing of droplets diameter,the evaporation time of droplets prolongs,cooling effect is more evident and cooling space is expanded. With the increa-sing of droplets diameter,the extent of humidifier expands,the range of humidifier keeps constant,and the relative humidity in local environment increases very little.The technology of fine water mist cooling in outdoor environment will reduce the human comfort index and improve the quality in outdoor environment effectively.

导出引用

王军锋, 屠欣丞, 黄继伟, 等. 细水雾室外环境降温效果的数值模拟[J]. 江苏大学学报（自然科学版）, 2009, 30(6): 591-595 https://doi.org/10.3969/j.issn.1671-7775.2009.06.012

Wang Junfeng, Tu Xincheng, Huang Jiwei, et al. Numerical simulation of cooling effect by fine water mist in outdoor environment[J]. Journal of Jiangsu University(Natural Science Edition), 2009, 30(6): 591-595 https://doi.org/10.3969/j.issn.1671-7775.2009.06.012

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