Mist/steam cooling in a heated horizontal tube -- Part 2: Results and modeling
Experimental studies on mist/steam cooling in a heated horizontal tube have been performed. Wall temperature distributions have been measured under various main steam flow rates, droplet mass ratios, and wall heat fluxes. Generally, the heat transfer performance of steam can be significantly improved by adding mist into the main flow. An average enhancement of 100% with the highest local heat transfer enhancement of 200% is achieved with 5% mist. When the test section is mildly heated, an interesting wall temperature distribution is observed: the wall temperature increases first, then decreases, and finally increases again. A three-stage heat transfer model with transition boiling, unstable liquid fragment evaporation, and dry-wall mist cooling has been proposed and has shown some success in predicting the wall temperature of the mist/steam flow. The PDPA measurements have facilitated better understanding and interpreting of the droplet dynamics and heat transfer mechanisms. Furthermore, this study has shed light on how to generate appropriate droplet sizes to achieve effective droplet transportation, and has shown that it is promising to extend present results to a higher temperature and higher pressure environment.
- Research Organization:
- Clemson Univ., SC (US)
- Sponsoring Organization:
- US Department of Energy
- OSTI ID:
- 20086938
- Journal Information:
- Journal of Turbomachinery, Journal Name: Journal of Turbomachinery Journal Issue: 2 Vol. 122; ISSN JOTUEI; ISSN 0889-504X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mist/steam cooling in a heated horizontal tube -- Part 1: Experimental system
Theoretical and experimental investigation of mist cooling of a heated plate