城市污水换热特性研究  

Study of the Heat Exchange Characteristics of Urban Sewage

作　　者：吴学慧[1] 龙秀艳[1] 孙德兴[2] 杨维好[1] 

机构地区：[1]中国矿业大学建筑工程学院深部岩土力学与地下工程重点实验室,江苏徐州221116 [2]哈尔滨工业大学市政与环境工程学院,黑龙江哈尔滨150027

出　　处：《中国矿业大学学报》2010年第4期568-574,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50578048);校优秀引进人才项目

摘　　要：为了解决城市原生污水低品位热源利用系统换热计算问题,依据污水的流变特性解析求解了定热流条件下圆管内污水的速度场和温度场,并获得了换热准则关系式.采用工程现场实验与理论计算的方法对圆管中污水的流动特性与换热能量方程进行了分析.结果表明:对于具有幂率流特征的城市污水,在广义雷诺数为4000～20000时圆管内紊流区的速度分布为v+=2.51lny++5.7;过渡区为v+=5.11lny+-3.22;层流区为v+=y+;与同条件下清水相似;而温度场较清水更复杂;对流换热准则关联式为Nuh=0.0196Reh0.91Pr0h.15.The temperature and velocity fields of sewage moving in a circular pipe were developed under boundary conditions where thermal flux was held constant.The heat exchange tie-in equation was improved.Those equations can be used to calculate the heat exchange of low-order thermal energy from urban untreated sewage for subsequent application.The flow characteristics and heat exchange energy equation were studied both by experiment and by theoretical analysis.The results show that the velocity distribution of the sewage,modeled as a power-law fluid in a circular pipe,is v^＋=2.51ln y^＋＋5.7;v^＋=5.11ln y^＋-3.22,or v^＋=y^＋ in the zones of turbulent,transitional or laminar flows respectively.The generalized Reynolds number varied from 4 000 to 20 000.These are similar to the eau douce under the same conditions.The tie-in equation of heat convection is Nuh=0.019 6Re0.91hPr0.15h.

关 键 词：城市污水 速度场 温度场 换热 准则关联式 

分 类 号：TU831.6[建筑科学—供热、供燃气、通风及空调工程]