Predictions of turbulent flow and heat transfer in gas–droplets flow downstream of a sudden pipe expansion

✍ Scribed by V.I. Terekhov; M.A. Pakhomov

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 732 KB
• Volume: 52
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/j.ijheatmasstransfer.2009.06.018

✦ Synopsis

Droplets-laden turbulent flow downstream of a sudden pipe expansion has been investigated by using Euler/Euler two-fluid model for the gaseous and dispersed phases. Significant increase of heat transfer in separated flow at the adding of evaporating droplets has been demonstrated (more than 2 times compare with one-phase flow at the value of mass concentration of droplets M L1 6 0.05). Addition of dispersed phase to the turbulent gas flow results in insignificant increase of the reattachment length.

Low-inertia droplets (d 1 6 50 lm) are well entrained into the circulation flow and present over the whole pipe section. Large particles (d 1 % 100 lm) go through the shear layer not getting into the detached area.

Comparison with experimental data on separated gas-droplets flows behind the plane backward-facing step has been carried out.