lecture 7 - Thermal and Fluids Engineering I Lecture 7...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Thermal and Fluids Engineering I Lecture 7 Page 1 Lecture 7 – Combined Thermal Resistances Radiation and Convection Consider a surface cooled by both radiation and convection: where T s is the surface temperature of the plate. The resistance network for this situation is rad conv QQ Q =+ && & s f ss u r r rad conv TT Q RR &
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Thermal and Fluids Engineering I Lecture 7 Page 2 Consider the special case in which the fluid and the surroundings are at the same temperature, T ss rad conv TT Q RR ∞∞ −− =+ & () 11 s rad conv QT T ⎛⎞ ⎜⎟ ⎝⎠ & s tot Q R = & Therefore 1 tot rad conv R 1 conv rad tot rad conv rad conv R rad conv tot rad conv R = + Since 1 tot rad conv R
Background image of page 2
Thermal and Fluids Engineering I Lecture 7 Page 3 tot rad conv hA h A h A =+ tot rad conv hh h Radiation is important for: - moderate temperatures with natural convection of gases - high temperatures with forced or natural convection of gases - situations when other modes of heat transfer are absent
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/08/2008 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

Page1 / 8

lecture 7 - Thermal and Fluids Engineering I Lecture 7...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online