热流科学与工程西幸文交通大堂教育部重点实验室3.5FDHT in Circular Tubes3.5.1 Introduction toFDHTintubesandducts3.5.2PhysicalandMathematicalModels3.5.3 Governing equations and their non-dimensionalforms3.5.4 Conditions for unigue solution3.5.5Numericalsolutionmethod3.5.6 Treatmentofnumericalresults3.5.7 Discussiononnumericalresults16/56
16/56 3.5 FDHT in Circular Tubes 3.5.2 Physical and Mathematical Models 3.5.3 Governing equations and their nondimensional forms 3.5.4 Conditions for unique solution 3.5.5 Numerical solution method 3.5.6 Treatment of numerical results 3.5.7 Discussion on numerical results 3.5.1 Introduction to FDHT in tubes and ducts
热流科学与工程西幸交通大学E教育部重点实验室3.5Fully DevelopedHTinCircularTubes3.5.1 IntroductiontoFDHT in tubesand ducts1.Simple fully developed heat transferPhysically: Velocity components normal to flowdirection equal zero, Fluid dimensionless temperaturedistribution is independent on（无关）the position inthe flow directionMathematically: Both dimensionless momentum andenergy equations are of diffusion typePresent chapter is limited to the simple cases17/56
17/56 3.5.1 Introduction to FDHT in tubes and ducts 1. Simple fully developed heat transfer Physically：Velocity components normal to flow direction equal zero; Fluid dimensionless temperature distribution is independent on (无关）the position in the flow direction Mathematically：Both dimensionless momentum and energy equations are of diffusion type. Present chapter is limited to the simple cases. 3.5 Fully Developed HT in Circular Tubes
热流科学与工程西幸交通大堂E教育部重点实验室FDHT in straight duct isan example of simplecases.-Taax2. Complicated FDHTIn the cross section normal to flow direction thereexist velocity componentsandthe dimensionlesstemperaturedepends ontheaxial position,oftenexhibits periodic（周期的）character.ThefullNavier-Stokes equations must be solvedThis subject is discussed in Chapter 11 of the textbook18/56
18/56 FDHT in straight duct is an example of simple cases. 2. Complicated FDHT In the cross section normal to flow direction there exist velocity components , and the dimensionless temperature depends on the axial position, often exhibits periodic (周期的）character. The full NavierStokes equations must be solved . This subject is discussed in Chapter 11 of the textbook. , , ( ) 0 w m w m b T T T x T
热流科学与工程西交通大学教育部重点实验室Examples of complicated FDHTTubebundle(bank）（管束）FFin-and-tubeLouverfin（百叶窗翅片）heatexchanger19/56
19/56 Examples of complicated FDHT Tube bundle (bank) (管束） Fin-and-tube heat exchanger Louver fin (百叶窗翅片)