摇摆对传热影响的机理分析

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基金项目:

国家自然科学基金项目(50806014)

空泡物理和自然循环重点实验室基金资助项目(9140C7105020805)

Mechanism Analysis of Effect of Rolling Motion on Heat Transfer

College of Nuclear Science and Technology, Harbin Engineering University, Harbin, 150001, China

摘要: 通过对摇摆情况下竖直加热管内流体流动的理论分析,建立了模型,推导出通道内的流速分布。研究了通道壁面附近流体的流动情况。分析认为摇摆情况下的竖直加热管内流动不同于普通的非定常流动,在通道壁面附近的边界层遭到破坏。在分析流动的基础上指出了竖直加热管内边界层被破坏的原因,进而指出摇摆影响传热的机理是摇摆使加热管壁面附近流动局部扰动加剧。
- 摇摆 /
- 传热 /
- 流量波动
Abstract: Theoretical analysis on the fluid flow in a vertical channel under rolling motion is performed to establish the mathematical model.The velocity distribution in the channel is derived from the model.The fluid flow near the channel wall is essentially investigated.The analysis shows that,the channel flow under rolling motion is different from the conventional unsteady flow.The boundary layer near the channel wall is destroyed and the cause is figured out based on the flow analysis.Furthermore,the mechanism of the effect of rolling motion on heat transfer is propounded.That is the rolling motion enhances the disturbance in the fluid flow near the heating channel wall.
- Rolling /
- Heat transfer /
- Flow fluctuation