两相流动理论基础课件.pptxVIP

1两相流动理论基础

2§10-1IntroductionThischapterintroducebasicconcepts,equationandsomemethods.Whereasthecomplexity,diversityandlevity,advancedanalysisrelatetoextensiveknowledge,hereonlyintroducecommontwo-phaseflowphenomenonandsomesimplemethoddecidingimportantparameter.Itestablishedthetheorybaseforstudyingadvancedtwo-phaseflow.Fundamentaloftwo-phaseflow

3两相流动理论基础§10-1引言本章介绍两相流动的基本概念、基本方程及一些处理方法。鉴于两相流动的复杂性、多样性和多变性，深入分析所涉及的知识十分广泛，这里仅介绍常见的两相流动现象及确定一些重要参数的简单方法，为进一步深入分析研究两相流动奠定基本的理论基础。

4Socalled“phase”isexistingformformatter.Generally,therearethreephasessolid,liquidandgas.Mixedflowofanytwoormorephasesinfusiblemattercalledmultiphaseflow.Multiphaseflowiscommonphenomenoninnature,dailylifeandmanyproject.Suchascloud,fog,rainandsnowphenomenon;dirtinatmosphere,sandinriverbloodflowinorganism;engine,burninginboiler,generateelectricity,refrigerate,vaporizeindistil;flowincongealcycle,oil,mineandtransportationofnaturalgas，matterflowedinallkindsofstove,pagodainchemicalproduction;millruninminingindustry,removingdirtinenvironmentdefenseandsoon.§10-2Summaryoftwo-phaseflowFundamentaloftwo-phaseflow

5两相流动理论基础所谓“相”是指物质存在的形态。通常有固、液、气三相。任何两相或两相以上不相溶物质的混合流动，统称为多相流动。多相流动是自然界、人类日常生活和许多工程中常见的流动现象。如自然界的云、雾、雨、雪现象，大气中的烟尘、水流中的泥沙、生物体内的血液流动、发动机、锅炉中的燃烧、发电、制冷和蒸馏过程中的蒸发、凝结循环系统中的流动，石油、天然气的开采和输送，化工生产中各种炉、塔中物质的流化，采矿工业中的选矿，环保工业中的除尘等等。§10-2两相流动概述

6Two-phaseflowmaybeplottedthreeclassaccordingtomatterstate:gas-solidtwo-phaseflow;liquid-solidtwo-phaseflow;gas-solidtwo-phaseflow;Asaresultofmuchthermodynamicsingas-liquid,theemphasesinthischapteriscorrelativeknowledgeaboutliquid-solidtwo-phaseflowandgas-solidtwo-phaseflow.Fundamentaloftwo-phaseflow

7两相流动理论基础两相流动根据物质的状态可分为三类：气—液两相流；液—固两相流；气—固两相流；由于气—液两相流涉及热力学较多的知识，故本章重点介绍液—固两相流和气—固两相流的相关知识。

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