please show me all the answers(objectives), many thanks!!

Post by **answerhappygod** » Mon May 16, 2022 8:57 am

: Please Show Me All The Answers Objectives Many Thanks 1 (38.93 KiB) Viewed 49 times

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Orifice Experiment Lab Data Orifice area (A) 0.000133 m² Orifice diameter: -13----------(mm) Mean K:- 0.0004 (from the graph) Mean Cdi 0.6789 Where A=area of orifice, and H=head over the orifice. Q K Estimated ca Q K A/29H 42g Mean Cd Mean Co Mean K A 129 H4/2 (m) S. No. 1 2 3 4 5 6 7 Guagging (m) reading (mm) 362 0.362 336 0.336 318 0.318 294 0.294 289 0.289 275 0.275 242 0.242 0.602 0.580 0.564 0.542 0.538 0.524 0.492 Actual Measured Data Set V (L) T (5) Q(m/s) Estimated Esitamed Co K using Eq.4 20 87 0.00023 10 45 0.00022 10 46 0.00022 10 48 0.00021 15 73 0.00021 10 50 0.00020 15 79 0.00019
EXPERIMENT 3: FLOW THROUGH AN ORIFICE - (10 marks) Objectives: (1) To observe the visual effect of delivery pressure (i.e. head) on water issuing from a horizontal jet or orifice i.e. to understand the relationship between H and Q for an orifice. (2) To develop a rating curve (i.e. a curve between measured H and Q) for the orifice(s) (calibrate the flow). (3) To understand how the Ca varies with flow for an orifice. (4) To find average Ca for the orifice using the H, H2 and Q data as drawn on a graph. Water Inlet Overflow Pipe Manometer Water Drain Pitot support shaft Pitot and micrometer Figure 3: Apparatus to measure flow through an orifice.
Steps to be followed: 1. Equipment is already set up for you, and is safe to use. 2. Start the pump on the hydraulic bench and adjust the flow so that the water level in the tank stays just above the overflow pipe in the tank (refer to the Figure 3). 3. Adjust the vertical inlet pipe upwards so that its outlet is just below the surface of the water in the tank, and allow the water level in the tank to stabilise. 4. Use the hydraulic bench to measure the flow. 5. Record the head inside the tank using the manometer. 6. Reduce the inlet flow so that the head falls say about 20-30 mm. Re-adjust the vertical inlet pipe upwards so that its outlet is just below the surface of the water in the tank. 7. Remember, allow conditions to stabilise, and measure the flow using the hydraulic bench. 8. Record the head again. 9. Repeat the experiment for FIVE times with lower H that give equal decrease in Q values (roughly 20-30 mm steps should work). 10. Use the following equation to Estimate C, for each line of your actual results. Q K Q Where K ..A-area of orifice, and H=head over the orifice. A/2gH 4/2g Mean K A/2g C . JH Mean Ca = 11. Plot your actual results for C vs Q (on X-axis) from this orifice experiment and discuss your results. 12. Plot your actual results for Hover weir crest (on X-axis) Vs. Q. Draw the best-fitting curve you can to the points.
13. Plot (on the same graph) H2 vs Q actual results - you should get a straight line, and its slope will be mean value of constant K for this orifice. Use this mean K value to determine the mean Ca for the orifice. How does this mean value compares with your estimated C, value found in your experiment? Discuss and explain why.