1. RADIATION AND COMBUSTION PHENOMENA
PROF. SEUNG WOOK BAEK
DEPARTMENT OF AEROSPACE ENGINEERING, KAIST, IN KOREA
ROOM: Building N7-2 #3304
TELEPHONE : 3714
Cellphone : 010 –
TA : Jonghan Won
ROOM: Building N7-2 # 3315
TELEPHONE : 3754
Cellphone :

2. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
RECONSIDER THE RADIATION BETWEEN TWO PARALLEL PLATES
SINCE (RECALL ITS DEFINITION)
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

3. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
EXAMPLE : RADIATION SHIELD
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

4. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
IN VIEW OF OR
FOR
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

5. RADIATIVE HEAT TRANSFER
UNDER EQUILIBRIUM (OR ADIABATIC)
RADIATIVE NON-EQUILIBRIUM
EXAMPLE : TWO SURFACES ENCLOSED WITH AN INSULATED THIRD SURFACE
WHERE
MORE ON THESE PROBLEMS LATER
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

6. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
VIEW FACTOR
equilateral triangle
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

7. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
isosceles triangle
square
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

8. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

9. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
FIRST CONSIDER
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

10. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
NEXT CONSIDER
THEN, FROM
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

11. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
INSERTING AND
THE LAST TWO CASES ARE USUALLY CALLED AS HOTTEL’S CROSSED-STRING METHOD.
HW #1 [Ref.1] P.243, #6-1, #6-5, #6-15
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

12. HW #1 [Ref.1] P.243, #6-1, #6-5, #6-15
6-1. Derive the configuration factor between a differential area centered above
a disk and a finite disk of unit radius.
6-5. The configuration factor between two infinite parallel plates of finite width L is in the configuration shown below in cross section.
(a) Derive an expression for by the crossed-string method.
(b) Derive an expression for by using the results of Problem 6-4 and configuration factor algebra.
[cf.] Prob.6-4. The configuration factor between two infinitely long directly opposed
parallel plates of finite width L is The plates are separated by a distance D.
6-15. Using the crossed-string method, derive the configuration factor between the infinitely long plate and cylinder shown below in cross section.
< 6-1 >
< 6-5 >
< 6-15 >

13. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
NET RADIATION FOR MULTI-SURFACES
RETURN TO SURFACE RADIATION
WITH ①
REARRANGE AS ②
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

14. RADIATIVE HEAT TRANSFER①
RADIATIVE NON-EQUILIBRIUM ②
IF IS KNOWN, ① GIVES THE HEAT FLUX OF THE SURFACE WITH SPECIFIED TEMERATURE, ② GIVES THE TEMPERATURE OF THE SURFACE WITH SPECIFIED HEAT FLUX. SO NEED
AS BEFORE ③
FOR SURFACES WITH SPECIFIED TEMPERATURE, WHEREAS ④
FOR SURFACES WITH SPECIFIED HEAT FLUX
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

15. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
SO NEED
(RADIATION INCIDENT TO WALL PER UNIT AREA)
FOR AN ENCLOSURE, RADIATION FROM TO
OR IN VIEW OF
THEN
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

16. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM ③ ④
ACCORDINGLY, FOR SPECIFIED ⑤
OR FOR SPECIFIED ⑥
① + ⑤
② + ⑥
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

17. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM ⑤
EXAMPLE
(Ref.1, p.266 )
TWO SURFACES WITH SPECIFIED TEMPERATURES OR
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

18. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
FOR TWO PARALLEL PLATES
FROM ①
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

19. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
EXAMPLE 2
THREE SURFACES WITH SPECIFIED TEMPERATURES OR
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

20. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
ENCLOSURE RADIATION
PROBLEMS
LUMPED
DISTRIBUTED (S6)
DISTRIBUTED (S6)
SPATIAL,
SPECULAR,
SPECTRAL,
RETAIN LUMPED
SPATIAL UNIFORM ELECTRICAL ANALOGY
SPECULAR DIFFUSE
SPECTRAL GRAY
GENERALIZED NET-RADIATION METHOD FOR INFINITESIMAL AREAS ALLOWS SPATIAL DISTRIBUTION
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

21. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
LOCAL HEAT FLUX
LOCAL RADIOSITY
RADIATION FROM TO
WITH RECIPROCITY RELATION
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

22. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
RADIATION FROM TO
BY DEFINITION
WHICH LEADS TO
ALSO
INTRODUCE
FINALLY
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

23. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
LOCAL RADIOSITY
THIS LEADS TO A SET OF N LINEAR INTEGRAL EQUATIONS INVOLVING
WHEN
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER

24. RADIATIVE HEAT TRANSFER
RADIATIVE NON-EQUILIBRIUM
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE HEAT TRANSFER