Previous studies have shown that spray cooling heat flux enhancement may be attained using enhanced surfaces (i.e., embedded surfaces). However, most enhanced surface spray cooling studies have been limited to extended surface structures. This study investigates the effect of porous tunnels (and pore size) on spray cooling heat flux. The pores were machined into the top of each heater block leading into the sub‐surface tunnels. Pore diameters varied between 0.25 mm and 1.0 mm. Pore density was held constant for each of the enhanced surfaces tested. Each copper block had a projected cross‐sectional area of Measurements were also obtained on a heater block with a flat surface for purposes of baseline comparison. A nozzle array was used with PF‐5060 as the working fluid. Thermal performance data was obtained under nominally degassed (chamber pressure of 41.4 kPa) conditions with a bulk fluid temperature of 20.5 °C. Results show that the highest critical heat flux (CHF) attained was using pores 1.0 mm in diameter. This gave an enhancement of 75% relative to the flat surface case.
Investigation of Pore Size Effect On Spray Cooling Heat Transfer With Porous Tunnels
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM‐STAIF 2008: 12th Conference on Thermophysics Applications in Microgravity; 1st Symposium on Space Resource Utilization; 25th Symposium on Space Nuclear Power and Propulsion; 6th Conference on Human/Robotic Technology and the Vision for Space Exploration; 6th Symposium on Space Colonization; 5th Symposium on New Frontiers and Future Concept ; 2008 ; Albuquerque (New Mexico)
AIP Conference Proceedings ; 969 , 1 ; 112-122
21.01.2008
11 pages
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Investigation of Pore Size Effect On Spray Cooling Heat Transfer with Porous Tunnels
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