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ホーム アーカイブ 役員 今後の会合 American Society of Thermal and Fluids Engineering

Experimental study on the effect of step-changing heating on water flow boing in a horizontal long mini-channel

Q. Huang
Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China

Li Jia
Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China

L. Yang
Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China

X. Zhang
Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China

C. Dang
Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China

DOI: 10.1615/TFEC2018.fmp.021342
pages 1053-1069


キーワード: Flow boiling, long small channel, step-changing heating, visualization

要約

In this study, experiments were performed to investigate the flow boiling heat transfer of deionized water in a rectangle (1 mm × 2 mm) horizontal long mini channel, and visualization experiments were carried out to study the transformations of flow patterns. Uniform heating (UH) and step-changing heating (SCH) were studied. The local heat transfer coefficients during both heating methods were compared and analyzed. Heat transfer coefficient curves showed same trends, but the slope of local heat transfer coefficient under of SCH was steeper and the occurrence of the dry-out flow would make the local heat transfer coefficient decrease. Besides, six kinds of flow patterns were observed, and an amendment correlation was proposed for a better prediction of heat transfer coefficient.

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