مقاله Single phase cooling of large surfaces with square arrays of impinging water sprays : تی پی بین

خلاصه مقاله

The single phase heat transfer from an upward facing, 100 cm² (0.01 m²) copper surface, to square arrays of impinging water sprays was experimentally investigated. Three models of commercially-available full-cone pressure nozzles, of varying flow and pulverization characteristics, were used in runs where average impinging coolant mass flux covered the 0.28–7.2 kg/m² s range. Array geometry was varied by adjusting nozzle-to-nozzle and nozzle-to-impingement surface distances. Experimental apparatus construction allowed for good drainage of spent coolant and unrestricted air entrainment to spray cones. The area-averaged heat transfer coefficient was found to be a strong function of coolant mass flux. Droplet Sauter mean diameter and nozzles discharge velocity appear to have secondary effects on the single phase heat transfer. Only one single geometric aspect ratio was found necessary for correlating measured data. The proposed correlation agreed with the experimental data within 18.9% error bounds (mean absolute error of 6.29%).

نویسندگان

Ricardo Hernandez Pereira [ Department of Mechanical Engineering, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea, 22453-900 Rio de Janeiro, RJ, Brazil ]

Sergio Leal Braga [ Department of Mechanical Engineering, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea, 22453-900 Rio de Janeiro, RJ, Brazil ]

José Alberto Reis Parise [ Department of Mechanical Engineering, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea, 22453-900 Rio de Janeiro, RJ, Brazil ]

کلمات کلیدی

Single phase heat transfer Spray cooling Spray impingement Square spray arrays

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Applied Thermal Engineering

The journal features aspects of the thermal engineering of advanced processes, including process integration, intensification and development, together with the application of thermal equipment in process plants. The optimisation of processes to maximise performance is also included.

حوزه های تحت پوشش : Applied Thermal Engineering