1.1、已知:如附图所示的两种水平夹层。 求:试分析冷、热表面间热量交换的方式有何不同?如果要 体 通过实验来测定夹层中流体的导热系数.应采用哪一种布置?

4-1对流换热概述 4-2层流流动换热的微分方程组 43对流换热过程的相似理论 4-4边界层理论 4-5紊流流动换热

1求解导热问题的三种基本方法:(1)理论分析法;(2)数值计算法;(3)实验法 2三种方法的基本求解过程 3(1)所谓理论分析方法,就是在理论分析的基础上,直接对微分方程在给定的定解条件下进行积分,这样获得的解称之为分析解,或叫理论解;

计算多表面组成的辐射换热系统中每一表面净换热量的计 算方法时一般采用网络法或数值方法。该方法的基础为有效辐 射

6.1 Source terms in momentum equations and two key issues in numerically solving momentum equation 6.1.1 Introduction 6.1.2 Source in momentum equations 6.1.3 Two key issues in solving flow field 6.2 Staggered grid system and discretization of momentum equation 6.2.1 Staggered grid(交叉网格) 6.2.2 Discretization of momentum equation in staggered grid 6.2.3 Interpolation in staggered grid 6.2.4 Remarks 1. Flow rate at a node 2. Density at interface 3. Conductance at interface 6.3 Pressure correction methods for N-S equation 6.3.1 Basic idea of pressure correction methods 6.3.2 Equations for velocity corrections of u ’, v ’ 6.3.3 Derivation of equation of pressure correction p ’ 6.3.4 Boundary condition for pressure correction

6.4.1 Calculation procedure of SIMPLE algorithm 6.4.2 Approximations in SIMPLE algorithm 6.4.3 Numerical example 6.4 Approximations in SIMPLE algorithm 6.4 Approximations in SIMPLE Algorithm 6.5 Discussion on SIMPLE and Convergence Criteria 6.5.1 Discussion on SIMPLE algorithm 6.5.2 Convergence criteria of flow field iteration 6.6 Developments of SIMPLE algorithm 6.6.1 SIMPLER－Overcoming 1st assumption of 6.6.2 SIMPLEC－Partially overcoming 2nd assumption 6.6.3 SIMPLEX－ Partially overcoming 2nd 6.6.4 Comparisons of algorithms 6.6.2 SIMPLEC－Partially overcoming the 2nd 6.6.3 SIMPLEX algorithm 6.6.5 IDEAL algorithms

6.7 Boundary condition treatments for open system 6.7.1 Selections for outlet boundary 6.7.2 Treatment of outlet boundary condition 6.7.3 Treatment of outlet boundary condition with 6.7.4 Methods for outlet normal velocity satisfying 6.7.1 Selections for outlet boundary position 6.7.2 Treatment of B.C. without recirculation 6.7.4 Methods for outlet normal velocity to satisfy 6.8.1 Natural convection in an enclosure 6.8.2 Numerical treatments of island (孤岛) 6.8 Fluid Flow and Heat Transfer in a Closed System 6.8 Fluid Flow and Heat Transfer in a Closed system 6.8.1 Natural convection in enclosure 6. Other examples of flow in enclosure 6.8.2 Numerical treatments for isolated island

5.1 Introduction to Solution Methods of ABEqs 5.2 Construction of Iteration Methods of Linear Algebraic Equations 5.3 Convergence Conditions and Acceleration Methods for Solving Linear ABEqs. 5.4 Block Correction Method –Promoting Conservation Satisfaction 5.5 Multigrid Techniques –Promoting Simultaneous Attenuation of Different Wave-length Components

实际物体的辐射不同于黑体。图7-11示出了同温度下某实际 物体和黑体的E=f(,T)的代表性曲线图上曲线下的面积分别 表示各自的辐射力

5-1管(槽)内流体受迫对流换热计算 5-2流体外掠物体的对流换热计算 5-3自然对流换热计算 5-4液体沸腾换热计算 5-5蒸汽凝结换热计算