实验流体力学
實驗流體力學
실험류체역학
JOURNAL OF EXPERIMENTS IN FLUID MECHANICS
2015年
4期
47-51,57
,共6页
Rayleigh-Bénard 对流%湍流热对流%湍流传热%非均匀加热
Rayleigh-Bénard 對流%湍流熱對流%湍流傳熱%非均勻加熱
Rayleigh-Bénard 대류%단류열대류%단류전열%비균균가열
Rayleigh-Bénard convection%turbulent thermal convection%heat transport%non-uni-form heating
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。
研究瞭空間非均勻加熱對 Rayleigh-Bénard 湍流熱對流繫統傳熱效率的影響。實驗採用長方體對流槽,以水為流體介質。調節加熱片的輸入功率,改變繫統註入能量的空間分佈,對比非均勻加熱與均勻加熱下的湍流傳熱 Nu-Ra 關繫。從實驗結果來看,非均勻加熱條件下 Nu 數的提升十分顯著,湍流傳熱效率明顯提高。
연구료공간비균균가열대 Rayleigh-Bénard 단류열대류계통전열효솔적영향。실험채용장방체대류조,이수위류체개질。조절가열편적수입공솔,개변계통주입능량적공간분포,대비비균균가열여균균가열하적단류전열 Nu-Ra 관계。종실험결과래간,비균균가열조건하 Nu 수적제승십분현저,단류전열효솔명현제고。
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.