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Flow resistance and heat transfer for single phase natural circulation flow in a vertical narrow rectangular channel   TIAN Chunping1, YANMing2, YANChangqi3, CAO Xiaxin4, and ZHU Zhiqiang5   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China (tianchunping001@163.com) 2. China Nuclear power Engineering Co., Lid., Beijing 10084, China (barton_h4@163.com) 3. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China (changqi_yan@163.com) 4. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China (caoxiaxin@hrbeu.edu.cn) 5. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China (443622044@qq.com)   Abstract: Experiment under natural circulation was performed to investigate the single phase flow and heat transfer characteristics of the one-side heating narrow rectangular channel The experiment was conducted for pressure ranging from 0.2 to 0.3MPa, inlet sub-cooling temperature from 30K to 60K and heat flux from 30 to 90 . The critical Reynold number in isothermal flow was about 2500. The experiment results indicated that the fraction factor can be well predicted by Shah & London correlation for laminar flow region and by Blasius correlation for turbulent flow regime. And the faction factor was found to decrease in turbulent region under natural circulation condition, when the test fluid was heated. Correlation for faction factors in natural circulation channel was carried out by modifying the Blasius correlation. Moreover, no obvious differences were found in heat transfer characteristics between natural circulation flow and force circulation flow. Keyword: narrow rectangular channel; natural circulation; convective heat transfer; flow resistance
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