Heat transfer performance and influences of spray cooling under quenching
| Autor: | Nianyong Zhou, Feng Hao, Enhai Liu, Muhao Xu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Quenching
Materials science Renewable Energy Sustainability and the Environment Spray cooling Physics::Instrumentation and Detectors transient spray cooling Physics::Fluid Dynamics Chemical engineering Heat transfer surface heat transfer TJ1-1570 cooling rate Mechanical engineering and machinery surface temperature drop |
| Zdroj: | Thermal Science, Vol 25, Iss 6 Part B, Pp 4805-4815 (2021) |
| ISSN: | 2334-7163 0354-9836 |
| Popis: | In this study, a closed-loop spray cooling system using R134a as the working fluid was established. The heat transfer characteristics and influencing mechanism of transient spray cooling were studied. The transient spray cooling curve under quenching was built accurately. The results show that the vapor film suppressed time, tsup, is the main period that the spray cooling must pass through. The flow rate and the sub-cooling of R134a have little effect on the cooling rate but the critical heat flux, which are mainly affected by chamber pressure. The transient Jacob number decreases with the increases of chamber pressure. As Jacob number decreases, the growth of vapor film is inhibited, then the tsup reduces in consequence. The surface temperature drop point and critical heat flux increases with the rise of chamber pressure. The maximum critical heat flux is 70.08 W/cm2 in this experiment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|