| Flow resistance characteristics of water in narrow annulus during heat exchange |
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| 作者姓名： | SUNLi-cheng YANChang-qi SUNZhong-ning ZHANGQing-hua |
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| 作者单位： | SchoolofPowerandNuclearEngineering,HarbinEngineeringUniversity,Harbin150001,China |
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| 摘 要： | Considering the special resistance characteristics of fluids flowing through ducts with small gaps, experiments are per-formed to investigate the resistance characteristics of single-phase water, which is forced to flow through vertical annuli. The gap sizes are 0.9, 1,4 and 2.4ram, respectively. The experiments are conducted under condition of 1 atm. The water in the annuli is heated by high temperature water reversely flowing through the inner tube and the outer annulus. The results show that the flow pattern begin to change from laminar to turbulent before Reynolds number approaches 2000, the flow resistance in annulus has llttie relations with the temperature difference and ways of being heated, but mainly depends on the ratio of mass flux to the width of annulus.
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| 关 键 词： | 流动性 液体阻力 小径管道 热量转换 摩擦压力 |
| 收稿时间： | 20 October 2006 |
Flow resistance characteristics of water in narrow annulus during heat exchange |
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| SUNLi-cheng YANChang-qi SUNZhong-ning ZHANGQing-hua.Flow resistance characteristics of water in narrow annulus during heat exchange[J].Journal of Marine Science and Application,2003,2(1):41-44. |
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| Authors: | Sun Li-cheng Yan Chang-qi Sun Zhong-ning Zhang Qing-hua |
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| Institution: | (1) School of Power and Nuclear Engineering, Harbin Engineering University, 150001 Harbin, China |
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| Abstract: | Considering the special resistance characteristics of fluids flowing through ducts with small gaps, experiments are performed to investigate the resistance characteristics of single-phase water, which is forced to flow through ver tical annuli. The gap sizes are 0.9, 1.4 and 2.4mm, respectively. The experiments are conducted under condition of 1atm. The water in the annuli is heated by high temperature water reversely flowing through the inner tube and the outer annulus. The results show that the flow pattern begin to change from laminar to turbulent before Reynolds number approaches 2000, the flow resistance in annulus has little relations with the temperature difference and ways of being heated, but mainly depends on the ratio of mass flux to the width of annulus. |
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| Keywords: | narrow annulus frictional pressure drop resistance characteristics |
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