清华大学热工基工程热力学加传热学第十一章ppt课件

1、11-1 热辐射的基本概念热辐射的基本概念 GGGGGGGGGG1GGGGGG100G dG d00G dG d00G dG d, , 0,1,00ddGG00ddGG00ddGG2Ar22ddAr2dsin d= sin d drrr 1,cosdLdAd ,L ,LL 0LLdd0EE d2EE d cosEL 2cosELd 251b/1CTCEeC 1 = 3 . 7 4 31 0 - 1 6 Wm2 ;C2 = 1.43910-2 mK。 33max2.8976 102.9 10m KT4bET251bb/()00dd1CTCEEe12bE2121bbdEE21bb00ddEE12b

2、E21121221bbb00bb 0b 0bbbddEEEFFFEEE251/0b0b 0441CTCdE deFTT251/01TCTCTdTfTe1221bbb 0b 0EFFE LL 常常数数 cosELcoscosnLE 2cos dEL 2cos sin d dL 2/200dsin cos dLL bEEbEEb0bdEEb0bdEE4bEET bbLEEL1.0 1.2n0.95 1.0n, , ,TT TT TT22121112dcosddcosbALArb22112dcosdcosEAAr12b1122coscosd dEA Ar121212b1122coscosd dAAE

3、A Ar 1212b1122coscosAAEdAdAr 121,21b1XAE212,12b2XA E121212211coscosd dAAA AAr 121212221coscosd dAAA AAr 11,222,1A XA X,1,2,11ni jiii ii njXXXXX1b11,21b11,1b11,abA E XA E XA E X1,21,1,abXXX1b11b11,21b11,31, 2 3AE XAE XAE X1,21,31, 2 3XXX121,21b1XAE121212211coscosd dAAA AAr 1,21X11,222,1A XA X12,12AXA

4、21,21,21aaAXXA1,22,11XX11,211,31A XA XA22,122,32A XA XA33,133,23A XA XA11,222,1A XA X11,333,1A XA X22,333,2A XA X11,211,322,31231()2A XA XA XAAA11,211,31A XA XA2312312,32222AAAlllXAl22,122,32A XA XA1321321,31122AAAlllXAl33,133,23A XA XA1231231,21122AAAlllXAl1,21,1,1acbdXXX 1,12acabacbcXl1,12bdabbdad

5、Xl 1,22adbcacbdXab1211,2b1A XE2122,1b2A XE1,2122111,2b122,1b2A XEA XE11,2b1b2A XEE22,1b1b2A XEEb1b21,211,21EEA X11,21A X,bb11nnii jii jijjjAXEEb1JEGEGJGAbEGAb1EJA1AbJEb11111 11EJA2b222221JEA1,211,2122,12A XJA XJ11,212A XJJ1211,21JJA X1212b1b212121 111,222111EEAA XAb1b212121 111,222111EEAA XA12AAA1,22,11XXb1b212()111A EE1,2b1b2AEE1,21X1b1b21,21122()111A EEAA12AA1,21 1b1b2AEEb1iiiiiiEJA,1nii jijjA XJJ1,1nijjii jJJA X(1)iibiiiJEGiiJGiibiiJEb1iiiiiEJA1,1nijjii jJJA X 1121212 121211nn44f1112Ah TTATT 44112f1TTTTh 44