I n s tr u c ti o n M a nu a l 012- 09486B ® *012-09486* Venturi Apparatus ME-8598
V en tu r i A p p ar a tu s Table of Contents Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Experiment. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venturi Apparatus ME-8598 2 1 6 3 4 5 Included Equipment Part Number Air Method: Recommended Equipment 1 Part Number 1. Venturi Apparatus base and top plate ME-8598 Spirometer Sensor 2 PS-2152 2. T-knob Screws (qty. 8) 617-024 One of the following: 3. Spirometer Tubing, 2.5 cm ID, 15 cm long 640-053 Shop Vacuum (or similar air supply) 3 4. Rubber Stoppers, 1-hole (qty. 2) 648-09597 Balloon and balloon pump 5. Restriction Clamps (qty.
V en tu r i A p p ar a tu s 012-09486B I n tr o du c ti o n Introduction In the Venturi Apparatus, air or water flows through a channel of varying width. As the cross-sectional area changes, volumetric flow rate remains constant, but the velocity and pressure of the fluid vary. With a Quad Pressure Sensor connected to the built-in Pitot tubes, the Venturi Apparatus allows the quantitative study and verification of the Continuity Equation, Bernoulli’s principle, and the Venturi effect.
Mo d el No . M E- 8 5 98 E x p er i m en t Setup 1. Connect the Quad Pressure Sensor to your PASPORT interface (but do not connect tubing to the pressure ports yet). If you are using a computer, start DataStudio. 2. Calibrate the Quad Pressure Sensor (see Appendix A). 3. Connect each of the four pressure tubes extending from the underside of the apparatus to the ports of the Quad Pressure Sensor as indicated in Figure 2. Important: Do not allow water to enter the sensor.
V en tu r i A p p ar a tu s 012-09486B E x p er i m en t straight, the pressure at Point 2 would be the average of P 1 and P 3. Calculate this theoretical pressure: P1 + P2 P 0 = -----------------2 (eq. 3) 6. Use the measured flow rate, R, and Equation 1 to calculate the fluid speed in the wide parts of the tube (υ0), and the speed in the venturi constriction (υ). 7. Use these values of υ0 and υ and Equation 2 to calculate the theoretical pressure (P) in the venturi constriction.
Mo d el No . M E- 8 5 98 A p pe n di x A : Q ua d P r es s u r e Ca l i br a ti o n Appendix A: Quad Pressure Calibration The purpose of this calibration is to fine-tune all four pressure measurements so they read the same when exposed to the atmosphere. This will allow the small pressure differences that occur in the apparatus to be measured more accurately. Conduct this procedure with all four pressure ports exposed to the same pressure. DataStudio 1.
V en tu r i A p p ar a tu s 012-09486B A pp en d i x B : Fl ui d S u pp l y a n d Fl ow R at e Appendix B: Fluid Supply and Flow Rate Measurement Options You can conduct the experiment using air or water as the fluid. In either case, you have a range of options for how to handle the fluid and how to measure the flow rate. Some of the possibilities are described in this appendix. In many of these setups, a PASPORT sensor is used to measure the flow rate.
Mo d el No . M E- 8 5 98 A pp e nd i x B : F lu i d S u pp l y a n d Fl o w Ra te Me a s ur e m en t O p t io n s Air Supply Method 2: Balloon Included Parts Required Rubber stopper with hole Short piece of fluid tubing (about 10 cm) Restriction Clamp Other Parts Required Rubber balloon Balloon pump (available at party supply stores) This method will produce a flow rate of about 0.5 L/s. Stretch the mouth of the balloon around the rubber stopper.
V en tu r i A p p ar a tu s 012-09486B A pp en d i x B : Fl ui d S u pp l y a n d Fl ow R at e other end of the spirometer tubing (see Figure 5 or 7). Assemble the mouthpiece and spirometer handle, and connect the spirometer to your PASPORT interface. The spirometer automatically calibrates itself every time you start data collection. During the first few seconds of data collection, it must remain still and away from air currents.
Mo d el No . M E- 8 5 98 A pp e nd i x B : F lu i d S u pp l y a n d Fl o w Ra te Me a s ur e m en t O p t io n s Open the clamp to let some water through the apparatus; then close it. Initially, there will be air in the apparatus; tilt it so that the air moves to the outflow port. Let some more water through to flush out the air. Repeat this process until all air has been removed from the apparatus and inflow tubing. Do not let the reservoir run empty, or new bubbles will enter. Close the clamp.
V en tu r i A p p ar a tu s 012-09486B A pp en d i x B : Fl ui d S u pp l y a n d Fl ow R at e 1. Install the three-step pulley on the rotary motion sensor. 2. Clamp the rotary motion sensor above the reservoir (see Figure 10). 3. Tie the float to one end of the string and the weight to the other end. Place the float in the reservoir, run the string over the large step of the pulley, and let the weight hang freely. Ensure that the weight will be free to move up as the water drains. 4.
Mo d el No . M E- 8 5 98 A pp e nd i x C : Co ns t an t s dF 1 R = ------- -----dt gρ (eq. 4) where dF/dt is the rate of increasing force, g = 9.81 N/kg, and ρ = 1000 kg/m3. Water-flow Measurement Method 4: Stopwatch In this method, you measure a volume and elapsed time to determine the average flow. Do this before collecting pressure data.
V en tu r i A p p ar a tu s 012-09486B Te c hn i c al Su p po r t Technical Support For assistance with any PASCO product, contact PASCO at: Address: PASCO scientific 10101 Foothills Blvd. Roseville, CA 95747-7100 Phone: 916-786-3800 (worldwide) 800-772-8700 (U.S.) Fax: (916) 786-3292 Web: www.pasco.com Email: techsupp@pasco.com For more information about the ME-8598 Venturi Apparatus and the latest version of this manual, go to the PASCO web site and enter ME-8598 in the Search window.
Mo d el No . M E- 8 5 98 T ec h n ic a l Su p po r t POLYSI TECHNOLOGIES, INC. 5108 REX MCLEOD DR. SANFORD, NC 27330 Phone: (919) 775-4989 Issued 4/7/95 Revision 3 4/1/2005 Material Safety Data Sheet I. Product Product Name: Product Type: Page 1 of 2 Barium Grease Petroleum Grease II. OSHA Components CAS # 64742-52-5 68201-19-4 WT % Range 70-75 25-30 Component Petroleum Nephthenic Oil Barium Soap- Insoluble III. Effects of Overexposure Eyes: Contact with eyes may cause redness.
V en tu r i A p p ar a tu s 012-09486B POLYSI TECHNOLOGIES, INC. 5108 REX MCLEOD DR. SANFORD, NC 27330 Phone: (919) 775-4989 Te c hn i c al Su p po r t Revision: 3 4/1/2005 Material Safety Data Sheet Page 2-2 Product # Barium Grease IX.Flammability Flash Point: Estimated HMIS Code: Health Hazard: Flammability Hazard Reactivity Explosive Limits: Extinguishing Agents: 435 open cup 100 1 0 0 Unknown Carbon Dioxide or dry chemical (small fires), foam or water spray X.
