传热学_第三章

1、 R2022-3-201 R2022-3-202 R2022-3-203 R2022-3-204 R2022-3-205x0 xtt(b)(a)(c) ttttqww1 R2022-3-206/1h /1h/1hwttx0 xtt(b)(a)(c) R2022-3-2071Bi 111BihBi R2022-3-208x0 xtt(b)(a)(c)1hBi95. 0m R2022-3-209 h h, t0AQc, c, V, t0tthAddtcV00tt ， tt0,0;cVAdd R2022-3-20100,0;cVhAdd0hAncV cVhAe0 R2022-3-2011() ()c

2、VA386. 010e01. 06 . 40e/0/s0.386101 R2022-3-20122()a()0VVh V AhABi FoV AcVeee()0.1Vh V ABiMV A1MV Ar 25 . 0M3rAV31M0333. 0VBi31M R2022-3-201322xtat , 00tt 0, 0, -()xtxxtxh tt R2022-3-2014过余温度 ),(txt22xa00 , 0 -tt0, 0 , -xxxxxh 22xtat , 00tt 0, 0, -()xtxxtxh tt R2022-3-2015)()(xX22xa00 , 0 -ttDdxXdXd

3、da22112211dxXdXdda只为只为 的函数的函数只为只为x的函数的函数0, 0 , -xxxxxh R2022-3-2016Da1aDeC12D21dda2221 d XX dx 21aeC)sin()cos(32xCxCX)sin()cos(),(2xBxAexa R2022-3-2017)sin()cos(),(2xBxAexa00 , 0 -tt0, 0 , -xxxxxh )cos(),(2xAexahtg)(c) R2022-3-20181()hhBitg R2022-3-2019)cos(),(11121xAexa)cos(),(22222xAexa)cos(),(2xA

4、exnnann.1)cos(),(2nnnaxAexn00 , 0 -tt)cos()sin()sin(20nnnnnA R2022-3-202022n 102sin( , )cos()exp()sincosnnnnnnxxa 2FoaBihx0( , )(Bi, Fo, )xxf211101112sin( , )cos()exp()sincosxxFonn R2022-3-2021mm00ttmm 00( )( , )( , )( )mmxx0( , )(Bi, Fo, )xxf211101112sin( , )cos()exp()sincosxxFo(Bi, )xf(Bi, Fo)f )x

5、(x,m1cos 0m R2022-3-2022)(),( ) Bi,(mxx)Fo Bi,( ) Bi,( ;)()(),(),(00fxfxxmm R2022-3-2023)Fo Bi,( ) Bi,( ;)()(),(),(00fxfxxmm0)( Fo) (Bi,m R2022-3-20240QQ VcQ002Fo1n22000mJ cossinsin212)()(2necdxcdxttcQnnnnn R2022-3-2025ttcQfQQ02000m2 );Bi Fo,(平壁每 R2022-3-202600QQQQtttt00 R2022-3-2027t tr rt tt tt t0 0000,rrFoBiftttt 200,raFohrBi12000,ccfBi FofBi r r FoBifQQ,30ttrt0 00 R2022-3-2028 R2022-3-2029u R2022-3-2030u R2022-3-2031 2222yxatt R20