正四角덕트내 코너영역에서의 流動特性에 관한 硏究 = (A) Study on the Flow Characteristics in Interior Corner Region of the Regular Square Duct

다국어 초록 (Multilingual Abstract)

The role of building facilites is creating a pleasant space to maintain every sences of residents with in the satisfying range. For this role, many researches on air conditioning system have been in progress by to many researchers.
Recently, building facilites part has been satisfied human demand in living space serving as intelligent building for the result.
Therefore, it is needed rearches and concerin on a duct, heat transport device.
For presenting primary date, we made a experimental duct and tested in size of x/D.
In this experimental study, we conclude as the following :
1. It is shown exactly symmetrical velocity distributions along the corner bisector.
2. As flows go by downstream, that uniform velocity line is wrenched shows the increased intensity of secondary flows.
3. The velocity is decreased in caused by friction in the entrance region. The energy loss quantity is large because the velocity gradient become bigger. But, it become the uniform flow in the fully developed region and relatively, loss quantity owing to collision of air particle shows largely.
4. It is distinguished portential flow domain and boundary flow domain by viscosity force which cause the developement of boundary layer on surface of duct when uniformity flow proceeds from the approoch to the end of duct.
There is not absolute uniformity flow for alteration velocity element however in the fully developed flow region, velocity profiles show parabulic distribution at laminar flow and show velocity distribution of a seventh of principle at turbulent flow.

목차 (Table of Contents)

• 목차 = ⅰ
• FIGURE LIST = ⅲ
• ABSTRACT = ⅴ
• Nomenclatures = ⅶ
• 1. 序論 = 1
• 1.1 연구의 배경 및 목적 = 1
• 1.2 연구의 방법 및 범위 = 2
• 2. 理論解析 = 5
• 2.1 레이놀즈수 (Reynolds number) = 5
• 2.2 속도 분포 = 6
• 2.2.1 층류유동 = 6
• 2.2.2 난류유동 = 6
• 2.3 연속방정식 = 8
• 2.4 운동량방정식 = 10
• 2.5 지배방정식 = 16
• 第3章 實驗裝置 및 實驗方法 = 23
• 3.1 實驗裝置 = 23
• 3.1.1 實驗 덕트 = 25
• 3.1.2 송풍기 (Blower) = 25
• 3.1.3 3-D 移送裝置 (3-D Traverse system) = 26
• 3.2 測定裝置 = 28
• 3.2.1 5-Hole Pitot Tube = 28
• 3.2.2 압력변환기 (Pressure Transducer) = 28
• 3.2.3 變換器 (A/D Converter) = 29
• 3.2.4 전원공급장치 = 30
• 3.2.5 增幅器 (Amplifier) = 31
• 3.3 實驗方法 = 32
• 4. 結果 및 考察 = 34
• 4.1 속도분포 = 34
• 4.2 난류전단응력분포 = 46
• 5. 結論 = 52
• 參考文獻 = 54
• 附錄 = 57
• Ⅰ. Data Acquisition Program = 58
• Ⅱ. LSM Program for Voltage = 67