水平对流中热耗散场及统计特性的研究
发布时间：2021-08-14 05:40
本文采用实验方法测量了水平热对流系统中冷热板上方的局部热耗散率,实验中使用特制的由四个完全相同的热敏电阻组成的温度梯度探头,测量装满水的对流腔体内的无量纲热耗散率εN（r）,测量获得水平热对流系统冷热板上方在不同Ra数以及不同垂直空间位置的局部热耗散率。本实验使用由四个直径为0.36 mm的热敏电阻组成的温度梯度探头,四个热敏电阻按直角坐标排布。实验选用的水平对流发生装置是一个尺寸比为长（L）:宽（W）:高（H）=10:1:1的长方体对流腔体,其长度、宽度和高度分别是500 mm、50 mm和50 mm。为保证系统与环境间没有热传递,对流装置外部由保温材料包裹,外部绝热放置于恒温箱内,并保持恒温箱内的环境温度恒定。实验系统参数可通过调整冷热板的温度来改变,本实验中普朗特数Pr基本维持恒定,约为4.8,瑞利数Ra的范围为2×1010～2×1011。根据GL理论,热耗散率包含两个部分,一项是平均热耗散率εm（r）,主要受平均温度梯度的影响;另一项是脉动热耗散率εf（r）,主要来自于从热边界层内产生的热羽流的拟序结构。本文实验发现,在所研究的Ra数范围内,无量纲局部热耗散率εN（r）主要集中...
【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校
【文章页数】：63 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Acknowledgement
Nomenclature
Chapter1 Introduction
1.1 Research background
1.2 Research status quo
1.3 Research content of this dissertation
Chapter2 Experimental setup
2.1 Temperature gradient probe
2.1.1 Assembly of temperature gradient probe
2.1.2 Calibration of temperature gradient probe
2.2 Data acquisition module
2.2.1 Data acquisition board Keysight34901A
2.2.2 Data collector Keysight34970A
2.3 Horizontal convection generation device and incubator
2.3.1 Horizontal convection generation device
2.3.2 Theoretical analysis based on the device
2.3.3 Incubator of the system
2.4 Summary
Chapter3 Measurement stability of temperature gradient porbe
3.1 Probability density functions of temperature fluctuation
3.2 Temperature profiles
3.3 Standard deviation of temperature signals
3.4 Summary
Chapter4 Thermal dissipation field above the heating plate
4.1 Vertical spatial distribution of temperature
4.2 Vertical spatial distributions of local thermal dissipation rate
4.3 Dependence of thermal dissipation rate and Ra
4.4 Summary
Chapter5 Thermal dissipation field above the cooling plate
5.1 Vertical spatial distribution of temperature
5.2 Vertical spatial distributions of local thermal dissipation rate
5.3 Summary
Chapter6 Analysis of statistical properties
6.1 Time series
6.2 Probability density functions
6.3 Summary
Conclusions
References
【参考文献】：
硕士论文
[1]水平热对流热传输及温度剖面的实验测量[D]. 鄢博.哈尔滨工业大学 2017
本文编号：3341876
【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校
【文章页数】：63 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Acknowledgement
Nomenclature
Chapter1 Introduction
1.1 Research background
1.2 Research status quo
1.3 Research content of this dissertation
Chapter2 Experimental setup
2.1 Temperature gradient probe
2.1.1 Assembly of temperature gradient probe
2.1.2 Calibration of temperature gradient probe
2.2 Data acquisition module
2.2.1 Data acquisition board Keysight34901A
2.2.2 Data collector Keysight34970A
2.3 Horizontal convection generation device and incubator
2.3.1 Horizontal convection generation device
2.3.2 Theoretical analysis based on the device
2.3.3 Incubator of the system
2.4 Summary
Chapter3 Measurement stability of temperature gradient porbe
3.1 Probability density functions of temperature fluctuation
3.2 Temperature profiles
3.3 Standard deviation of temperature signals
3.4 Summary
Chapter4 Thermal dissipation field above the heating plate
4.1 Vertical spatial distribution of temperature
4.2 Vertical spatial distributions of local thermal dissipation rate
4.3 Dependence of thermal dissipation rate and Ra
4.4 Summary
Chapter5 Thermal dissipation field above the cooling plate
5.1 Vertical spatial distribution of temperature
5.2 Vertical spatial distributions of local thermal dissipation rate
5.3 Summary
Chapter6 Analysis of statistical properties
6.1 Time series
6.2 Probability density functions
6.3 Summary
Conclusions
References
【参考文献】：
硕士论文
[1]水平热对流热传输及温度剖面的实验测量[D]. 鄢博.哈尔滨工业大学 2017
本文编号：3341876
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