针对二氧化碳作为制冷剂在微细通道内两相流沸腾换热进行了实验与理论研究,采用红外成像观测与传热系数实验研究,定量与定性地分析了热通量2~35 k W·m-2,饱和温度-10~10℃工况时,内径为1、2、3 mm圆管内的传热系数。实验结果表明...针对二氧化碳作为制冷剂在微细通道内两相流沸腾换热进行了实验与理论研究,采用红外成像观测与传热系数实验研究,定量与定性地分析了热通量2~35 k W·m-2,饱和温度-10~10℃工况时,内径为1、2、3 mm圆管内的传热系数。实验结果表明：当质量流率增加时干涸起始干度逐渐降低,当质量流率小于临界值时,干涸现象结束之后,传热系数随着质量流率增加基本维持不变,而当质量流率大于临界值时,干涸现象结束之后,随着质量流率增加传热系数相应增加;随着管径增加,干涸发生的质量流率越小,临界热通量越大,同时管径越小传热系数越高。展开更多
The Ebinur Lake and its peripheral regions are the important wetlands in Xinjiang. However, its lake bed is recently dried up in large area. Analyzing from the data monitored by EOSVMODIS satellite, the water area of ...The Ebinur Lake and its peripheral regions are the important wetlands in Xinjiang. However, its lake bed is recently dried up in large area. Analyzing from the data monitored by EOSVMODIS satellite, the water area of the Ebinur Lake has been sharply reduced since summer 2006, its lake bed has been dried up in large area since late-July, and such situation became more serious up to mid-August. According to the data monitored by EOS\MODIS satellite, the water area of the lake was 550.6 km2 on August 19, 2006, and it was reduced by 263.4 km2, 126.4 km2 and 158.4 km2 comparing with that in late-July and early-August 2006 and mid-August 2005, respectively.According to the data monitored by EOS\MODIS satellite, the water area of the Ebinur Lake fluctuated in a range of 700-1 000 km2 during the period from April 2002 to July 2006, and it was larger than 1000km2 during the period from the end of spring to early summer 2005 (Tab.1). However, the water area of the Ebinur Lake was reduced to 550.6 km2 in mid-August 2006, the lake bed was dried up in large area, and the water area was the smallest since recent 4 years.展开更多
文摘针对二氧化碳作为制冷剂在微细通道内两相流沸腾换热进行了实验与理论研究,采用红外成像观测与传热系数实验研究,定量与定性地分析了热通量2~35 k W·m-2,饱和温度-10~10℃工况时,内径为1、2、3 mm圆管内的传热系数。实验结果表明：当质量流率增加时干涸起始干度逐渐降低,当质量流率小于临界值时,干涸现象结束之后,传热系数随着质量流率增加基本维持不变,而当质量流率大于临界值时,干涸现象结束之后,随着质量流率增加传热系数相应增加;随着管径增加,干涸发生的质量流率越小,临界热通量越大,同时管径越小传热系数越高。
文摘The Ebinur Lake and its peripheral regions are the important wetlands in Xinjiang. However, its lake bed is recently dried up in large area. Analyzing from the data monitored by EOSVMODIS satellite, the water area of the Ebinur Lake has been sharply reduced since summer 2006, its lake bed has been dried up in large area since late-July, and such situation became more serious up to mid-August. According to the data monitored by EOS\MODIS satellite, the water area of the lake was 550.6 km2 on August 19, 2006, and it was reduced by 263.4 km2, 126.4 km2 and 158.4 km2 comparing with that in late-July and early-August 2006 and mid-August 2005, respectively.According to the data monitored by EOS\MODIS satellite, the water area of the Ebinur Lake fluctuated in a range of 700-1 000 km2 during the period from April 2002 to July 2006, and it was larger than 1000km2 during the period from the end of spring to early summer 2005 (Tab.1). However, the water area of the Ebinur Lake was reduced to 550.6 km2 in mid-August 2006, the lake bed was dried up in large area, and the water area was the smallest since recent 4 years.
