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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2005.2
- 수록면
- 169 - 179 (11page)
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Nucleate boiling experiments on heating surface of constant wall temperature were performed using R113 for almost saturated pool boiling conditions. A microscale heater army and Wheatstone bridge circuits were used to maintain a constant wall temperature condition of heating surface and to measure the heat flow rate With high temporal and spatial resolutions Bubble images during the bubble growth were taken as 5000 frames per second using a high-speed CCD camera synchronized With the heat flow rate measurements The bubble growth behavior was analyzed using the new dimensionless parameters for each growth regions to permit comparisons With previous experimental results at the same scale. We found that the new dimensionless parameters can describe the whole growth region as initial and later (thermal) respectively The comparisons showed good agreement in the initial and thermal growth regions. In the initial growth region
including surface tension controlled, transition and inertia controlled regions as divided by Robinson and Judd,
the bubble growth rate showed that the bubble radius was proportional to t2/3 regardless of working fluids and heating conditions. And ill the thermal growth region as also called asymptotic region, the bubble showed a growth rate that was proportional to t1/5, also. Those growth rates were slower than the growth rates proposed ill previous analytical analyses The requited heat flow rate for the volume change of the observed bubble was estimated to be larger than the heat flow rate measured at the wall. Heat, which is different from the Instantaneous heat supplied through the heating wall, can be estimated as being transferred through the interface between bubble and liquid even With saturated pool condition. Tins phenomenon under a saturated pool condition needs to be analyzed and the data from this study can supply the good experimental data With the precise boundary condition (constant wall temperature).
including surface tension controlled, transition and inertia controlled regions as divided by Robinson and Judd,
the bubble growth rate showed that the bubble radius was proportional to t2/3 regardless of working fluids and heating conditions. And ill the thermal growth region as also called asymptotic region, the bubble showed a growth rate that was proportional to t1/5, also. Those growth rates were slower than the growth rates proposed ill previous analytical analyses The requited heat flow rate for the volume change of the observed bubble was estimated to be larger than the heat flow rate measured at the wall. Heat, which is different from the Instantaneous heat supplied through the heating wall, can be estimated as being transferred through the interface between bubble and liquid even With saturated pool condition. Tins phenomenon under a saturated pool condition needs to be analyzed and the data from this study can supply the good experimental data With the precise boundary condition (constant wall temperature).
목차
Abstract
1. 서론
2. 실험
3. 차원 해석
4. 실험결과 및 고찰
5. 결론
후기
참고문헌
참고문헌 (21)
참고문헌 신청
Robinson, A J and Judd, R L, 2001, “Bubble Growth m a Uniform and Spatially Distributed Temperature Field," Int J of Heat and Mass Transfer, Vol 44, pp 2699~2710
Han, C H and Griffith, P, 1965, “The Mechanism of Heat Transfer in Nucleate Pool Boiling-Part I Bubble Imitation, Growth and Departure," Int J Heat Mass Transfer, Vol 8, pp 887~904
Cole, R and Shulman, H L, 1966, “Bubble Growth Rates at High Jakob Numbers," Int J Heat Mass Transfer, Vol 9, pp. 1377~1390
Rule, T D. and Kim, J., 1999, “Heat Transfer Behavior on Small Horizontal Heaters During Pool Boiling," J of Heat Transfer, Vol 121, No 2, pp. 386~393
Lee, J, Kim, J and Kiger, K T, 2001, “Time-and Space-Resolved Heat Transfer Characteristics of Single Droplet Cooling using Macroscale Heater Arrays," Int J of Heat and Fluid Flow, Vol 22, pp 188~200
Han, C H and Griffith, P, 1965, “The Mechanism of Heat Transfer in Nucleate Pool Boiling-Part I Bubble Imitation, Growth and Departure," Int J Heat Mass Transfer, Vol 8, pp 887~904
Cole, R and Shulman, H L, 1966, “Bubble Growth Rates at High Jakob Numbers," Int J Heat Mass Transfer, Vol 9, pp. 1377~1390
Rule, T D. and Kim, J., 1999, “Heat Transfer Behavior on Small Horizontal Heaters During Pool Boiling," J of Heat Transfer, Vol 121, No 2, pp. 386~393
Lee, J, Kim, J and Kiger, K T, 2001, “Time-and Space-Resolved Heat Transfer Characteristics of Single Droplet Cooling using Macroscale Heater Arrays," Int J of Heat and Fluid Flow, Vol 22, pp 188~200
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