Experimental study of turbulent Rayleigh-Bénard convection under non-uniform heating boundary conditions
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摘要: 研究了空间非均匀加热对 Rayleigh-Bénard 湍流热对流系统传热效率的影响。实验采用长方体对流槽,以水为流体介质。调节加热片的输入功率,改变系统注入能量的空间分布,对比非均匀加热与均匀加热下的湍流传热 Nu-Ra 关系。从实验结果来看,非均匀加热条件下 Nu 数的提升十分显著,湍流传热效率明显提高。
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关键词:
- Rayleigh-Bénard 对流 /
- 湍流热对流 /
- 湍流传热 /
- 非均匀加热
Abstract: We present an experimental investigation of heat transport by turbulent Rayleigh-Bénard (RB)convection under non-uniform heating boundary conditions.During the measure-ments,the Rayleigh number Ra varies from 9×10 8 to 7×10 9 and the Prandtl number Pr is fixed at Pr=5.4.By adjusting the spatial distribution of the heating power in the lower plate,we ob-served an enhancement in the Nusselt number Nu by 13%.Therefore,our results reveal that the non-uniform heating can enhance the global heat transport efficiency of the system. -
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