The effect of the tilt angle on mixed convection and related heat transfer in a“T”shaped double enclosure with four heated obstacles on the bottom surface is numerically investigated.The considered obstacles are con...The effect of the tilt angle on mixed convection and related heat transfer in a“T”shaped double enclosure with four heated obstacles on the bottom surface is numerically investigated.The considered obstacles are constantly kept at a relatively high(fixed)temperature,while the cavity’s upper wall is cooled.The finite volume approach is used to solve the mass,momentum,and energy equations with the SIMPLEC algorithm being exploited to deal with the pressure-velocity coupling.Emphasis is put on the influence of the tilt angle on the solution symmetry,flow structure,and heat exchange through the walls.The following parameters and related ranges are considered:Rayleigh number 104≤Ra≤5.105,tilt angle 0°≤φ≤90°,Reynolds number 100≤Re≤1000,Prandtl number Pr=0.72,block height B=0.5,opening width C=0.15,and distance between blocks D=0.5.The results reveal different branches of solutions on varying Re andφ.They also show that the symmetry of the solution regarding the P_(2)axis is retained for all cases with no tilt and for values of Re between 100 and 1000.展开更多
无砟轨道扣件实现了钢轨与混凝土道床、下部基础的连接。扣件受力除轮轨作用下的正常服役工作状态外,还包括桥梁地段梁端变形诱发扣件受力状态变化。为保障桥梁地段无砟轨道扣件正常服役状态,本文以32 m T型梁为载体,通过分析梁端转角...无砟轨道扣件实现了钢轨与混凝土道床、下部基础的连接。扣件受力除轮轨作用下的正常服役工作状态外,还包括桥梁地段梁端变形诱发扣件受力状态变化。为保障桥梁地段无砟轨道扣件正常服役状态,本文以32 m T型梁为载体,通过分析梁端转角、垂向位移、预留梁缝及扣件安装位置等变量,研究了T型梁梁端变形及接口构造对无砟轨道扣件受力的影响。结果表明:梁端变形引起的扣件上拔力与梁端转角、垂向位移及转角位移组合变形线性相关,提出了不同构造变量与扣件上拔力的线性表达式。研究成果可为客货共线桥梁铺设无砟轨道梁端变形控制及构造设计提供参考。展开更多
文摘The effect of the tilt angle on mixed convection and related heat transfer in a“T”shaped double enclosure with four heated obstacles on the bottom surface is numerically investigated.The considered obstacles are constantly kept at a relatively high(fixed)temperature,while the cavity’s upper wall is cooled.The finite volume approach is used to solve the mass,momentum,and energy equations with the SIMPLEC algorithm being exploited to deal with the pressure-velocity coupling.Emphasis is put on the influence of the tilt angle on the solution symmetry,flow structure,and heat exchange through the walls.The following parameters and related ranges are considered:Rayleigh number 104≤Ra≤5.105,tilt angle 0°≤φ≤90°,Reynolds number 100≤Re≤1000,Prandtl number Pr=0.72,block height B=0.5,opening width C=0.15,and distance between blocks D=0.5.The results reveal different branches of solutions on varying Re andφ.They also show that the symmetry of the solution regarding the P_(2)axis is retained for all cases with no tilt and for values of Re between 100 and 1000.
文摘无砟轨道扣件实现了钢轨与混凝土道床、下部基础的连接。扣件受力除轮轨作用下的正常服役工作状态外,还包括桥梁地段梁端变形诱发扣件受力状态变化。为保障桥梁地段无砟轨道扣件正常服役状态,本文以32 m T型梁为载体,通过分析梁端转角、垂向位移、预留梁缝及扣件安装位置等变量,研究了T型梁梁端变形及接口构造对无砟轨道扣件受力的影响。结果表明:梁端变形引起的扣件上拔力与梁端转角、垂向位移及转角位移组合变形线性相关,提出了不同构造变量与扣件上拔力的线性表达式。研究成果可为客货共线桥梁铺设无砟轨道梁端变形控制及构造设计提供参考。
