一、影响传热膜系数的因素 1、流体流动状态 层流：忽略自然对流时，层流底层＝r 湍流：主要热阻在层流层，Re，边界层

偏导数 定义 12.1.1 设 D 2 R 为开集， z f x y x y =  ( , ), ( , ) D 是定义在 D 上的二元函数，( , ) 0 0 x y D 为一定点

Director: Guru Dutt Production: Guru Dutt Films Pvt. Ltd.; colour, 35mm; CinemaScope (first Indian CinemaScope production); running time: 150 minutes. Producer: Guru Dutt; screenplay and dialogue: Abrar Alvi; pho￾tography: V. K. Murthy; editor: Y. G. Chauhan; art director: M. R. Achrekar; sound: S. V. Rama; music: S. D. Burman; songs: Kaifi Azmi; costumes: Bhanumati. Cast: Baby Naaz (Pammy); Venna (Bina); Mahesh Kaul (Father-in￾law); Waheeda Rehman (Shanti); Guru Dutt (Suresh Sinha); Johnny

Production: Vermedia (Lisbon), Cooperativa Arco-Íris (Bissau), Eurocréation Production (Paris), and Rádiotelevisão Portuguesa (Lis￾bon); color, 35mm; running time: 90 minutes. Released 1992. Producer: Paulo de Sousa; screenplay: Flora Gomes, Ina Césair