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자료유형
학술저널
저자정보
저널정보
대한기계학회 대한기계학회 논문집 B권 대한기계학회논문집 B권 제28권 제8호
발행연도
2004.8
수록면
895 - 901 (7page)

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Single-phase convection and nucleate boiling heat transfer were locally Investigated for confined planar water Jets. The detailed distributions of the wall temperature and the convection coefficient as well as the typical boiling curves were discussed The curve for the single~phase convection indicated the developing laminar boundary layer, accompanied by monotonic Increase of the wall temperature in the stream direction. Boiling was initiated from the furthest downstream as heat flux Increased. Heat transfer variation according to the streamwise location was reduced as heat flux increased enough to create the vigorous nucleate boiling
Velocity effects were considered for the confined free-surface jet Higher velocity of the jet caused the boiling incipient to be delayed more The transition to turbulence precipitated by the bubble-induced disturbance was obvious only for the highest velocity, which enabled the boding incipient to start in the middle of the heated surface, rather than the furthest downstream as was the case of the moderate and low velocities The temperature at offset line were somewhat lower than those at the centerline for single-phase convection and partial boiling, and these differences were reduced as the nucleate boding developed For the region pnor to transition, the convection coefficient distributions were similar in both cases while the temperatures were somewhat lower in the submerged jet For single-phase convection, transition was initiated at x/W=2 5 and completed soon for the submerged jet, but the onset of transition was retarded to the distance at x/W=6 for the free-surface jet

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Abstract

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2. 실험장치 및 방법

3. 결과와 검토

4. 결론

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