地球的地理結(jié)構(gòu)很復(fù)雜,地表面通常是傾斜的,特別是在山地、山谷、河流或湖泊地區(qū)。此外,由于地球表面溫度通常隨時(shí)間變化,傾斜表面的溫度大于上方流體（可能是空氣或水）的溫度時(shí),較熱的表面加熱流體,從而產(chǎn)生沿傾斜表面向上的流動(dòng),稱為上坡流。另一方面,如果傾斜表面的溫度低于上述流體的溫度,則較冷的表面冷卻流體,并沿著傾斜表面向下流動(dòng),形成下坡流。這種上坡流和下坡流是山谷或河流流域中斜坡流動(dòng)的典型情況。斜坡流在傳熱傳質(zhì)中起著關(guān)鍵作用,特別是在大氣中的污染物輸送,因此斜坡流是理解V形幾何形狀流動(dòng)過(guò)程的基礎(chǔ)。另外,腔體中由浮力引起的流體運(yùn)動(dòng)在自然界和工程中有廣泛的應(yīng)用。大量的文獻(xiàn)對(duì)由于內(nèi)力或外力作用,不同的幾何形狀以及時(shí)間條件（定�；蚍嵌ǔ＃┮鸬牧鲃�(dòng)進(jìn)行研究。由于自然對(duì)流在許多工業(yè)過(guò)程中有重要應(yīng)用,大多數(shù)研究者已經(jīng)考慮過(guò)與水平或垂直熱壁相鄰的自然對(duì)流流動(dòng)。然而,針對(duì)斜坡邊界對(duì)自然對(duì)流流動(dòng)的影響,矩形腔體模型并不適用。因此,三角形腔內(nèi)的自然對(duì)流流動(dòng)收到廣泛關(guān)注。同時(shí),地球表面通常很復(fù)雜,這些規(guī)則的幾何形狀在大多數(shù)地理環(huán)境中并不適用,其中傾斜的幾何形狀對(duì)系統(tǒng)有重要影響。特別地,V形腔中的自然對(duì)流也受到關(guān)... 

【文章來(lái)源】：北京交通大學(xué)北京市 211工程院校 教育部直屬院校

【文章頁(yè)數(shù)】：206 頁(yè)

【學(xué)位級(jí)別】：博士

【文章目錄】：
Acknowledgements
ABSTRACT
Chinese Abstract
Nomenclature
1 Introduction
    1.1 Problem description
        1.1.1 Flow phenomena in a V-shaped topography
        1.1.2 Natural convection in a V-shaped cavity
    1.2 Literature Review
        1.2.1 Natural phenomena on an inclined topography
        1.2.2 Natural convection on an incline wall or in a cavity with an inclined wall or more
        1.2.3 Analytical methods of natural convection
    1.3 Summary of literature review
    1.4 Objectives and outline of the present study
2 Analytical,numerical and experimental procedures
    2.1 Formulation
        2.1.1 Governing equations
        2.1.2 Appropriate assumptions
    2.2 Scaling Analysis
    2.3 Numerical approach
        2.3.1 Numerical Schemes
        2.3.2 Convergence criterion
    2.4 Experimental procedure
        2.4.1 Experimental model
        2.4.2 Measurement techniques
        2.4.3 Experimental arrangements
    2.5 Summary
3 Transient natural convection of initially stratified fluid in a V-shaped cavity
    3.1 Physical model and scaling analysis
    3.2 Validation
    3.3 Development of transient natural convection
        3.3.1 Flow structure
        3.3.2 Temperature and velocity
        3.3.3 Time of the stratification breakup
    3.4 Heat and mass transfer
    3.5 Summary
4 Transition to an unsteady flow in a two-dimensional V-shaped cavity
    4.1 Transition to an unsteady flow for air
        4.1.1 Mesh and time step
        4.1.2 Validation
        4.1.3 Numerical results and discussion
        4.1.4 Heat and mass transfer
    4.2 Transition to an unsteady flow for water
        4.2.1 Mesh and time step
        4.2.2 Validation
        4.2.3 Numerical results and discussion
        4.2.4 Heat and mass transfer
    4.3 Summary
5 Transition to an unsteady flow in a three-dimensional V-shaped cavity
    5.1 Physical model and formula
    5.2 Transition to an unsteady flow for air
        5.2.1 Mesh and time step
        5.2.2 Validation
        5.2.3 Numerical results and discussion
        5.2.4 Heat and mass transfer
    5.3 Transition to an unsteady flow for water
        5.3.1 Mesh and time step
        5.3.2 Validation
        5.3.3 Numerical results and discussion
        5.3.4 Heat and mass transfer
    5.4 Summary
6 Experimental study of the transition to an unsteady flow
    6.1 Flow visualizations and temperature measurements with thermistor
        6.1.1 Steady state
        6.1.2 Unsteady state
    6.2 Summary
7 Conclusions
    7.1 Summary of the present research
        7.1.1 Natural convection of initially stratified fluid
        7.1.2 Transition to an unsteady flow
    7.2 Future studies
References
The author's resume and research results obtained during his Ph.D
學(xué)位論文數(shù)據(jù)集


【參考文獻(xiàn)】：
期刊論文
[1]THE PHYSICAL STRUCTURE OF THE WINTER FOG IN CHONGQING METROPOLITAN AREA AND ITS FORMATION PROCESS[J]. 李子華,張利民,張慶鴻.  Acta Meteorologica Sinica. 1994(03)



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