简介:摘要随着中国经济的飞速发展,环境及能源问题日趋严峻。太阳能作为可再生清洁能源备受重视,太阳能集热器事业也遍地开花,成为大众日常生活中不可或缺的集热设备。我们已知热泵系统的供热性能系数是评价热泵制热效果的核心参数,是系统制热量与输入功率的比值。由逆卡诺定理可知,提高低温热源的温度和降低高温热源的温度都可以提高系统的供热性能系数。尤其是低温热源的变化对系统供热系数的影响更大。提高集热器出楼水温的方法有很多,笔者从改变水流量对不同水流形式的集热管(横排式和竖排式)集热效果的角度入手,提出了一些优化意见。由于现实情况中不允许搭建真实的试验台,笔者将通过用ANSYS软件仿真模拟的方法进行研究和理论性分析。
简介:Sandblastingmachinesarewidelyusedinchemical,mechanicalandotherengineeringfields.Theinternalflowfieldofthesandblastingmachinebelongstoacomplexgas-solidtwo-phaseflow,andimpactbythecontinuousabrasivesandcancausethemachinetowearorevenfail.Inthisstudy,theEDEM-FLUENTcouplingmethodwasusedtocalculatethetransientflowfieldofthegasphaseandthemotion,dynamicandcollisioncharacteristicsofthesand.Airinthesandblastingmachinewastreatedastheidealgasandthecontinuousphase.Thesandwasregardedasthediscretephasesolidinthecomputation.UsingtheArchardwearmodel,thewearamountofthesandblastingmachinewascalculatedandthewearlawwasanalysed,toprovideatheoreticalbasisforoptimisingthedesignandoperationmethodoftheblastingmachine.
简介:Sandblastingmachinesarewidelyusedinchemical,mechanicalandotherengineeringfields.Theinternalflowfieldofthesandblastingmachinebelongstoacomplexgas-solidtwo-phaseflow,andimpactbythecontinuousabrasivesandcancausethemachinetowearorevenfail.Inthisstudy,theEDEM-FLUENTcouplingmethodwasusedtocalculatethetransientflowfieldofthegasphaseandthemotion,dynamicandcollisioncharacteristicsofthesand.Airinthesandblastingmachinewastreatedastheidealgasandthecontinuousphase.Thesandwasregardedasthediscretephasesolidinthecomputation.UsingtheArchardwearmodel,thewearamountofthesandblastingmachinewascalculatedandthewearlawwasanalysed,toprovideatheoreticalbasisforoptimisingthedesignandoperationmethodoftheblastingmachine.
简介:Fluentversion6.2computationalfluiddynamicsenvironmenthasbeenenhancedwithapopulationbalancecapabilitythatoperatesinconjunctionwithitsmultiphasecalculationstopredicttheparticlesizedistributionwithintheflowfield.Thepopulationbalanceissolvedbythequadraturemethodofmoments(QMOM).Fluent'spredictioncapabilitiesaretestedbyusinga2-dimensionalanalogyofaconstantlystirredtankreactorwithafluidflowcompartmentthatmixesthefluidquicklyandefficientlyusingwallmovementandhasafeedstreamandaproductstream.TheresultsoftheseFluentsimulationsusingQMOMpopulationbalancesolverarecomparedtosteadystateanalyticalsolutionsforthepopulationbalanceinastirredtankwhere1)growth,2)aggregation,and3)breakage,takeplaceseparatelyand4)combinednucleationandgrowthand5)combinednucleation,growthandaggregationtakeplace.Theresultsofthesecomparisonsshowthatthemomentsofthepopulationbalanceareaccuratelypredictedfornucleation,growth,aggregationandbreakagewhentheflowfieldisturbulent.Withlaminarflowthemixingisnotidealandasaresultthesteadystatewellmixedsolutionsarenotaccuratelysimulated.
简介:摘要:文章主要是分析了Fluent计算,在此基础上讲解了风道结构的优化情况,望可以为有关人员提供到一定的参考和帮助。