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이응렬(E.-R. Lee),박태균(T.-K. Park),신태룡(T.-R. Shin),김내현(N.-H. Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The effect of oil on the flow boiling of R-123 in enhanced tube bundles was experimentally investigated. Three different tube bundles having different pore diameters were tested. The effect of mass flux, quality and heat flux were also investigated. It is shown that even a small amount of oil significantly reduced the heat transfer coefficient. The effect of heat flux on the reduction of heat transfer coefficient was significant. The reduction increased as the heat flux decreased. The effect of pore diameter was significant at a high heat flux. Largest reduction was observed for the tube where the heat transfer coefficient was the largest. The data are compared with the pool boiling counterpart.
신태룡(T.-R. Shin),이응렬(E.-R. Lee),한성필(S.-P. Han),김내현(N.-H. Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The air and water flow distribution are experimentally studied for a round header - microchannel tube configuration. The number of tubes were 10 and 30. The effects of tube outlet direction, tube protrusion depth, mass flux, and quality are investigated. For the downward flow configuration, the water flow distribution is significantly affected by the tube protrusion depth. For flush-mounted configuration, most of the water flows at the frontal part of the header. As the protrusion depth increases, the water is forced to the rear part of the header. However, for the upward flow configuration, the effect of the protrusion depth is negligible. As the mass flux or the quality increases, the water flow is forced to the rear part of the header. Negligible difference on the water flow distribution is observed between the parallel flow and the reverse flow configuration.
신태룡(T.-R. Shin),이응렬(E.-R. Lee),김내현(N.-H. Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The row-by-row heat transfer characteristics of fin-and-tube heat exchangers having wavy fins were experimentally investigated. Three samples having different rows (one, two and three) were tested. Results show that the heat transfer coefficient is strongly dependent on the tube row. The heat transfer coefficient of the first row is larger than those of second or third rows. However, the difference decreases as the Reynolds number increases. The heat transfer coefficients of the second and the third row are approximately the same, probably due to increased mixing of bulk flow by wavy channels. Although samples have different tube row, the heat transfer coefficients of same row are approximately the same.