Experimental platform and procedures overview a

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Experimental Platform and Procedures Overview A virtual laboratory platform is used in this experiment. The experimental system includes a ball suspended in a water or air jet. You are asked to identify the dependence of the ball suspension height on various parameters such as the sizes of the ball and water jet, the fluid properties and the flow velocity etc. Specially, the relevant variables to be considered in this virtual experiment include:
4 W: the weight of the ball (N); h: the height of the ball suspension (m); D: the diameter of the ball (m); d: the orifice diameter of the jet (m); Q: flow rate (m3/s); ρ: the density of the fluid (kg/m3); μ: the viscosity of the fluid (Ns/m2); Procedures: 1.Installation of Virtual Laboratory (VL) Follow the links provided in Blackboard to download the VL. There are two versions, one for Mac users and the other for Windows users. Mac version: After you download the Mac version, you need to unzip the file. You will then get a standalone application that can be opened directly. Windows version: After you download the Windows version, you can double click the file. You will then need to go through an installation process, after which you will get a standalone application in Program Files (X86) folder if you are running a 64-bit Windows. 2.Data Collection Once you have successfully installed the program and open it by double-clicking the relevant executable, such as VirtualLab.exe, you will be taken to the following login screen: Figure 1. The login diaglog
5 Before you log on to the VL for the first time, you must register in the system using your USYD email. A valid internet connection is required all the time. Please follow the on-screen instructions to register and then log on. After you have successfully logged in, you will be presented with some instructions as shown in Figure 2 below. Figure 2. The instructions for the virtual labPlease read the information and instructions carefully and press Learn More or the Red Cross button to bypass the instructions. You will then enter the virtual laboratory environment, as shown below. Figure 3. The virtual laboratory environment
6 As shown in Figure 3, you will be able to change the Flow Rate (Q), the type of balls with different parameters and fluid medium. The water or air jet will evolve accordingly and the ball will be suspended at different heights, depending on the parameter settings. You can press the Save button () to record a data set, which also includes all relevant settings such as the flow rate and the ball number etc. Please note, you should press the Save button only after the ball stops movingas you need to make sure that the ball height is approximately stable. You can check your collected data in the right table on the screen.

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