A framework for scaling pool boiling heat flux is developed using data from various heater sizes over a range of gravity levels. Boiling is buoyancy dominated for large heaters and/or high gravity conditions and the heat flux is heater size independent. The power law coefficient for gravity is a function of wall temperature. As the heater size or gravity level is reduced, a sharp transition in the heat flux is observed at a threshold value of Lh/Lc = 2.1. Below this threshold value, boiling is surface tension dominated and the dependence on gravity is smaller. The gravity scaling parameter for the heat flux in the buoyancy dominated boiling regime developed in the previous work is updated to account for subcooling effect. Based on this scaling parameter and the transition criteria, a methodology for predicting heat flux in the surface tension dominated boiling regime, typically observed under low-gravity conditions, is developed. Given the heat flux at a reference gravity level and heater size, the current framework allows the prediction of heat flux at any other gravity level and/or heater size under similar experimental conditions. The prediction is validated using data at over a range of subcoolings (7°C ≤ ΔTsub ≤ 32.6°C), heater sizes (2.1 mm ≤ Lh ≤ 7 mm), and dissolved gas concentrations (3 ppm ≤ cg ≤ 3500 ppm). The prediction errors are significantly smaller than those from correlations currently available in the literature.
Skip Nav Destination
ASME/JSME 2011 8th Thermal Engineering Joint Conference
March 13–17, 2011
Honolulu, Hawaii, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-3892-1
PROCEEDINGS PAPER
On the Scaling of Pool Boiling Heat Flux With Gravity and Heater Size
Rishi Raj,
Rishi Raj
University of Maryland, College Park, MD
Search for other works by this author on:
Jungho Kim,
Jungho Kim
University of Maryland, College Park, MD
Search for other works by this author on:
John McQuillen
John McQuillen
NASA Glenn Research Center, Cleveland, OH
Search for other works by this author on:
Rishi Raj
University of Maryland, College Park, MD
Jungho Kim
University of Maryland, College Park, MD
John McQuillen
NASA Glenn Research Center, Cleveland, OH
Paper No:
AJTEC2011-44449, T10237; 18 pages
Published Online:
March 1, 2011
Citation
Raj, R, Kim, J, & McQuillen, J. "On the Scaling of Pool Boiling Heat Flux With Gravity and Heater Size." Proceedings of the ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASME/JSME 2011 8th Thermal Engineering Joint Conference. Honolulu, Hawaii, USA. March 13–17, 2011. T10237. ASME. https://doi.org/10.1115/AJTEC2011-44449
Download citation file:
12
Views
Related Proceedings Papers
Related Articles
On the Scaling of Pool Boiling Heat Flux With Gravity and Heater Size
J. Heat Transfer (January,2012)
Heater Size and Gravity Based Pool Boiling Regime Map: Transition Criteria Between Buoyancy and Surface Tension Dominated Boiling
J. Heat Transfer (September,2010)
Related Chapters
Forced Convection Subcooled Boiling
Two-Phase Heat Transfer
Pool Boiling
Thermal Management of Microelectronic Equipment
Pool Boiling
Thermal Management of Microelectronic Equipment, Second Edition