Fluid temperature fluctuations accompanying turbulent heat transfer in a pipe

✍ Scribed by S. Tanimoto; T.J. Hanratty

• Publisher: Elsevier Science
• Year: 1963
• Tongue: English
• Weight: 411 KB
• Volume: 18
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(93)80006-c

✦ Synopsis

The fluctuating temperatures in a fluid which accompany turbulent heat transfer were studied for fully developed turbulent flow of air in a pipe using small heat fluxes at the wall. In the fully developed region of the temperature field the root-mean-square temperature fluctuation, B', at the centre of the pipe equals about 0.042 (TO -TB) and inCreaSeS t0 a maXimUm Of about O-10 (To -TB) close to the pipe wall, where TO is the wall temperature and TB is the mixed average temperature. The maximum occurs at y+ = 25-30. Temperature fluctuations close to the wall are of lower frequency than temperature fluctuations in the pipe centre. The temperature fluctuations are markedly similar, both in their magnitude and in their variation with distance from the wall, to measurements of velocity fluctuations. _