Study on Nucleate Boiling Heat Transfer by Measuring Detailed Surface Temperature Distribution and Variation With Infrared Radiation Camera-猫眼课题宝

DOI：

10.1115/imece2014-37448

发表时间：

2014-11

期刊：

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中科院分区：

其他

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作者：

Kazuki Takahashi;Y. Koizumi

为考察核池沸腾的基本过程，对101 kPa的水进行了池沸腾传热实验。传热表面由铜制印刷电路板制成。换热面尺寸为10 mm × 10 mm。向传热表面提供直流电使其升温。在传热表面的中心部分取下铜层背面的胶木板。试验容器是一个封闭的200毫米立方体容器，由硬铝制成。它在相对的侧壁上有透明的观察窗，由聚碳酸酯板制成，以观察沸腾状态。传热面放置在试验容器的底部。实验用的是蒸馏水。用红外辐射相机测量了传热面背面温度的瞬时变化。用高速摄像机记录了气泡的行为。本实验采用的红外辐射相机的时间分辨率为60 Hz， 0.1 mm × 0.1 mm，空间分辨率为120 Hz， 0.315 mm × 0.315 mm。当热流密度增大时，地表温度的瞬时变化解释了这一规律。在隔离气泡区，表面温度在等待时间内是均匀的。沸腾气泡生成开始时，气泡下表面温度大幅度下降。气泡离开传热表面后，表面温度恢复到原来均匀的温度分布。气泡产生距离气泡中心1.8 mm以上，表面温度不受气泡产生的影响。在中高热流密度区，地表温度和热流密度变化较小。而热流密度的变化范围与孤立沸腾区较为接近。ASME版权所有©2014

Pool boiling heat transfer experiments were performed for water at 101 kPa to examine elementary process of nucleate pool boiling. The heat transfer surface was made from a copper printed circuit board. The size of the heat transfer surface was 10 mm × 10 mm. Direct current was supplied to the heat transfer surface to heat it up. The Bakelite plate of the backside of the copper layer was taken off at the center portion of the heat transfer surface. The test vessel was a closed 200-mm cube container made of duralumin. It has transparent view windows on opposing side walls made of a Polycarbonate plate to observe a boiling state. Heat transfer surface was placed at the bottom of the test vessel. Distilled water was used for the experiments. The instantaneous variation of the backside temperature of the heat transfer surface was measured with an infrared radiation camera. Bubble behavior was recorded with a high speed video camera. The time and the space resolution of the infrared radiation cameras used in present experiments were 60 Hz and 0.1 mm × 0.1 mm, and 120 Hz and 0.315 mm × 0.315 mm, respectively. When the heat flux was increased, the instantaneous surface temperature variation explain the pattern. In the isolated bubble region, surface temperature was uniform during waiting time. When boiling bubble generation started, a large dip in the surface temperature was formed under the bubble. After the bubble left from the heat transfer surface, the surface temperature returned to former uniform temperature distribution. Surface temperature was not affected by the bubble generation beyond 1.8 mm from the center of the bubble. In the intermediate and high heat flux region, the variation of surface temperature and heat flux were small. Rather the heat flux variation range was close to that at the isolated boiling region.Copyright © 2014 by ASME

Study on Nucleate Boiling Heat Transfer by Measuring Detailed Surface Temperature Distribution and Variation With Infrared Radiation Camera

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