| 透壁通风管路堤的对流换热和蒸发散热 |
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| 引用本文： | 孙斌祥,杨丽君,王伟,章金钊,汪双杰.透壁通风管路堤的对流换热和蒸发散热[J].岩土力学,2012,33(3):674-680. |
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| 作者姓名： | 孙斌祥 杨丽君 王伟 章金钊 汪双杰 |
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| 作者单位： | 1. 绍兴文理学院 土木工程系，浙江 绍兴 312000；2. 中交第一公路勘察设计研究院有限公司 多年冻土区公路建设与养护技术交通行业重点实验室，西安 710075 |
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| 基金项目： | 国家自然科学基金项目(No.40972203,40772194);中交多年冻土区公路建设与养护技术交通行业重点实验室开放基金项目(No.HSKF2007-03,HSKF2007-05) |
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| 摘 要： | 针对透壁通风管路堤中透壁通风管管壁与空气之间的对流换热和土体水分通过管壁小孔的蒸发散热机制，分析了开孔率、风速及含水率等因素对透壁通风管管壁对流换热和水分蒸发散热的影响，并具体给出了管壁对流换热系数和蒸发散热系数的计算公式。冬季路堤由于冻土层未冻水含量较小而使管壁小孔的水分蒸发散热较弱，路堤总的降温效果主要由管壁对流换热效应控制，而暖季通风管内空气与管壁的对流换热效应可使路堤土体增温，同时，由于通风管周围融土的未冻水含量较大，而使得通过管壁小孔的水分蒸发散热较强，可部分或全部抵消对流换热引起的增温效应，而有利于路堤的稳定。
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| 关 键 词： | 冻土路堤 透壁通风管 对流换热 蒸发散热 降温效果 |
| 收稿时间： | 2010-05-04 |
Convective heat transfer and evaporative heat removal in embankment with perforated ventilation pipe |
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| SUN Bin-xiang
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YANG Li-jun
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WANG Wei
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ZHANG Jin-zhao
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WANG Shuang-jie.Convective heat transfer and evaporative heat removal in embankment with perforated ventilation pipe[J].Rock and Soil Mechanics,2012,33(3):674-680. |
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| Authors: | SUN Bin-xiang YANG Li-jun WANG Wei ZHANG Jin-zhao WANG Shuang-jie |
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| Institution: | 1. Department of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Key Laboratory of Highway Construction and Maintenance Technology for Permafrost Regions, Ministry of Communications, CCCC First Highway Consultants Co., Ltd., Xi’an 710075, China |
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| Abstract: | Convective heat transfer between the air and the pipe wall and evaporative heat removal from the surface of the soil bared in the small holes of the pipe wall are two modes of heat transfer in duct-ventilated embankments with perforated ventilation pipe.The effects of perforating ratio,wind velocity and water content on convective and evaporative heat transfer by the wall of the perforated ventilation pipe are analyzed.The formulae for heat transfer coefficients of convection and evaporation in the perforated ventilation pipe are obtained.The total cooling effect in duct-ventilated embankments during winter is mainly dominated by convective heat transfer due to weak evaporative cooling based on smaller unfrozen water in frozen soils.During warm time,the effect of convective heat transfer between the ambient air and the pipe wall may raise the temperature of the embankment soil,whereas the effect of evaporative cooling by the small holes of the pipe wall is significant due to large unfrozen water content in unfrozen soils,thus being able to partially or completely balance out the heating effect in the embankment due to convective heat transfer and to ensure the embankment stability. |
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| Keywords: | permafrost embankment perforated ventilation pipe convective heat transfer evaporative heat removal cooling effect |
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