Study on dryout point and heat transfer in subcooled flow boiling through vertical narrow annular channels  

作　　者：DING Guo-zhong HUANG Su-yi SU Shun-yu LI Jia HU Xing-hua 

机构地区：[1]Corresponding author： HUANG Hu-lin, Ph.D., professor research fields： solar energy application, MHD flow and heat transfer. E-mail： [e-mail]. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《Journal of Energy and Power Engineering》2007年第1期15-21,共7页能源与动力工程（美国大卫英文）

基　　金：This work is supported by the Project of National Natural Science Foundation of China （No. 50076014） and the Project of Major State Basic Research Program （No. G2000026303）.

摘　　要：The purpose of this study is to conduct the dryout point and heat transfer correlation for subcooled boiling flow in narrow annuli. First, the dryout point of subcooled flow boiling of water was measured in narrow annular channels under the working condition of pressure ranging from 0.1 to 0.3 MPa and low mass flow rate from 6 to 60 kgm^-2 s^-1. Experimental test channels were annular and heated bilaterally with the channel gap of lmm and 1.5mm, and heated length of 1500mm.The location of the dryout was observed and measured by experiment with investigating the various system parameter effects on dryout point, and the results show that the location of dryout point is basically stable and repeating and the heat transfer coefficient increased with heat flux, mass flux and pressure, however, decreases with the gap size. Next, new correlations of CHF and critical vapor quality for narrow annular channels was proposed and calculation results shown a good agreement with the experimental data.

关 键 词：dryout point heat transfer subcooled flow boiling narrow annular channels 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TQ051.5[动力工程及工程热物理—热能工程]