![]() ![]() Torus picture courtesy of:ġ9 Measure distance and angle: measure radius (D/2) from core to coreĢ0 To insure accurate measurement of radius r, take 6 measurements from the same side of the torus half from the core to the outside wall and average them: radius 1Ģ4 Results cont. Mass is calculated using the density of H2O at room temp. Set parameter to Velocity magnitude and Type to Polyline Draw the line across the region with the highest velocity determined by the color-bar Plot data Record the velocity for that frame Repeat this process to take a running averageġ8 Torus volume Volume of a torus is 2π²(D/2)r². The polyline can be drawn through the regions of highest velocity denoted by the color bar. This is represented in a graph with the Y-axis as velocity and the X-axis as the distance on the line. ![]() ![]() Only look at 1 frame and average the same frame for each runĪ polyline is a line segment that calculates each individual vector’s velocity. A running average: take 20 slides after -0- and average the velocity calculations (smoothing data) 2. 0- frame (represented as -0-) is the moment the water is completely expelled from the tube into the aquarium Velocity is calculated by programming the flow rate (i.e.833ml/s)*distance fluid traveled (i.e m) = 0.026m/s². Apply to all framesġ3 Calibration: load calibration image and select reference distance along with time stepġ4 Plot: set display parameter to velocity magnitude, smooth data to 20% and apply to all frames Post processing: set standard deviation (stdev) filter threshhold to 8. After experimentation, film a known distance for a calibration imageħ PIVlab 1.2 Analysis Procedure: load images with sequencing style 1-2, 2-3, 3-4,…Ĩ Select region of interest (ROI) just below the glass pipe openingĩ Image pre-processing, enable contrast-limited adaptive histogram equalization (CLACHE) and highpass filtering (highpass) CLACHE enhances contrast in the image Highpass sharpens the image and removes background signalsġ0 PIV settings: set interrogation area ( in both dimensions) to 24 and Step ( spacing between the centers of interrogation area) in both dimensions to 12ġ2 Post processing: set standard deviation (stdev) filter threshhold [n Program the syringe pump to 50ml/hr., which calculates to m/s (which is the maximum pumping rate for these syringes) 8. ![]() Program the diameter of the syringes and set pump to Continuous run 7. Using a level, plumb the glass tube to make it vertical.Ħ. Insert the glass tube into the water, slightly under the water’s surface. After silicone is cured, fill the PIV tank with water to desired level. Silicone all tubing joints, as not to allow any air to enter or exit the tube system. Accurately mark the glass tube at 32.6mm (calculated with the ID using πr²h) above the opening. Two, plastic 60ml syringes with inside diameter (ID)of of 26mm 2m of clear rubber hose with an ID of 4.5mm T-valve Clear, glass or plastic tubing with of ID of 6.25mm and outside diameter (OD) of 7.7mm Buret Clamp Silicone PIV systemġ. PIVlab 1.2 Analysis Procedure Results Sources of Error Conclusions Future Directionsģ Equipment Harvard Syringe Pump Model 33 1 Particle Image Velocimetry (PIV) Calibration PresentationĪ step-by-step guide to calibrating a custom PIV system using PIVlab 1.2.Ģ Contents Equipment Configuration Physical Procedure ![]()
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