Lab 3 Wind Tunnel - Lab 3: Wind Tunnel Fluid Flow and Heat...

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Lab 3: Wind Tunnel Fluid Flow and Heat Transfer over a Flat Plane Mike Beanland - Lead Author Creighton Adsit Carl Hansen Joe Larsen MANE 4020 Section 1 Group 2 4/7/08
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MANE 4020, Lab 3, Spring 2008 1 Executive Summary: This lab consisted of two separate experiments done in a wind-tunnel apparatus. The first experiment was an experimentally determined boundary layer profile as compared to a theoretically determined boundary layer profile. The theoretically determined profile was similar enough to the experimentally determined value to conclude that the 1/7 th Power Law approximation is satisfactory. The next objective of the first experiment was to determine the skin friction coefficient base upon experimental data and then compare it to a theoretical value. After the experimental data was worked into usable results they were extremely close to the accepted theoretical value. The second experiment consisted of the determination of a local heat transfer coefficient as a function of Reynolds number. It measured the temperature of air as it flowed across a flat plane. As the air progress its way down the heated plane, its ability to absorb heat decline as it stayed in its laminar flow. When the flow changed to turbulent at the Reynolds number value of 3*10^5 the air’s heat transfer coefficient dramatically increased. When the experimental values were compared to the theoretical values it can be concluded that the theoretical approximation is accurate.
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MANE 4020, Lab 3, Spring 2008 2 Table of contents Section Page Number Executive Summary 1 List of Figures and Tables 2 1. Introduction 3 2. Experimental Apparatus 3–5 3. Experimental Procedure 6 4. Results and Discussion 6–9 5. Conclusion 9 6. References 9 Appendix A: Sample Calculations 10–15 Part 1: Boundary Layer and Velocity Profile 10–11 Part 2: Skin Friction Coefficient 11–12 Part 3: Stanton Number 12–15 Appendix B1: Experimental Boundary Layer Data 16 Appendix B2: Experimental Thermocouple Layer Data 17–19 Appendix C: Apparatus Specification Tables 20 List of Figures and Tables: Number Description Figure 2–1 Diagram of Wind Tunnel Figure 2–2 Cross Section of Wing Figure 4–1 Velocity Profile under Fast Free Stream Velocity Condition Figure 4–2 Velocity Profile under Slow Free Stream Velocity Condition Table 4–1 Table of Theoretical vs. Experimental Skin Friction Coefficients Figure 4–3 Stanton Number Correlation Diagram Figure A–1 Circuit analogy diagram for the heat transfer of the wing. Figure A–2 Resistances of each layer.
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MANE 4020, Lab 3, Spring 2008 3 1. Introduction: A common situation encountered in fluid engineering problems involves forced air flow over a flat surface. Examples include a fan blowing air across a heat sink or the roof of a car driving on the highway. Therefore it is critical to have some understanding of how the air flow behaves in this type of situation order to solve any sort of related engineering problem. Unfortunately the turbulent
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Lab 3 Wind Tunnel - Lab 3: Wind Tunnel Fluid Flow and Heat...

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