21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

C1Po2D-07 [05]: Entropy generation in the woven mesh regenerator filler of cryocoolers

22 Jul 2019, 14:00
2h
Level 6, Cryo Expo Exhibit Hall ()

Level 6, Cryo Expo Exhibit Hall

Poster Presentation C1Po2D - Heat Exchangers

Speaker

Ali Ghavami (Georgia Tech)

Description

The regenerator is a key component of a pulse tube cryocooler, and is also a major contributor to irreversibility and losses in the cryocooler. In this study a method for the assessment of losses in cryocooler regenerators based on entropy generation is proposed. Pore-level CFD simulations are performed for woven mesh regenerator filler by defining periodically repeating unit cells. Simulations are performed for steady-state (uni-directional) as well as periodic flows. It is shown that entropy generation in periodic flow is significantly higher than in steady flow, and is sensitive to operating parameters as well as small geometric irregularities. It is proposed that by optimization of the microstructure of generator fillers the entropy generation and losses can be minimized.

Primary author

Ali Ghavami (Georgia Tech)

Co-authors

Tao Fang (Georgia Institute of Technology) Dr Mostafa Ghiaasiaan (Georgia Institute of Technology)

Presentation Materials