Directiоns: Exаm - This is а clоsed bоok, closed notes exаm. You are allowed one notes sheet as described in class– you are required to turn in this formula sheet with your exam. Remember to use the provided tables for problem solving. To maximize any partial credit, you should indicate which table you used to get any values. Make sure to adhere to the honor code statement. You have 1 hour and 20 minutes to complete the exam. Best of luck! Honor Code Statement: "I understand and accept my responsibility as a member of the Georgia Tech Community to uphold the Academic Honor Code at all times. In addition, I understand my options for reporting honor violations as detailed in the code. To the best of my knowledge, I have not used materials or information which can provide me with an unfair advantage over my peers." Signature: _________________________________ Date: ______________________ Directions: True or False – Write the entire word, not just ‘T’ or ‘F’. Also, write down approximately 1 sentence to support your answer (it does not need to be very long nor detailed, just provide some justification). (2 pts/each) In terms of the mass flow rate dot product convention, if the dot product of V ∙ n > 0, then V and n have components in the same direction which is true for inflow. For a perfect gas, can be reduced to Euler equations imply zero shear stress at solid walls due to the assumed absence of viscosity. This phase diagram accurately shows the difference between a high and low pressure line. In the Eulerian approach to the conservation equations, the observer identifies a particle or group of particles and moves with them to see how their properties change. pdV is the only reversible work mode for a simple compressible substance. Assuming calorically perfect gas, and are functions of pressure but not temperature. Reynolds transport Theorem states that for an extensive property (B) with its intensive version (b), then: , and could be summarized with the idea of PICO. With this in mind, the Change term in the Reynolds transport Theorem is the CM derivative on the left side of the equation. For rotational flow, Bernoulli’s equation can be applied to two points on the same streamline A manometer directly measures absolute pressure without reference to any external pressure/ Directions: Fill in the Blank – Write the correct word, or words, to fill in the following blanks. (2 pts/each) When dealing with non-ideal gases, the ________________ factor Z corrects for the gas behaving more like a liquid due to higher intermolecular interactions. In the English unit system, mass is measured with units of either ________ or pound mass. The mass flow rate in one-dimensional, uniform flow can be calculated by multiplying the density, ___________, and cross sectional area. ___________ forces are a type of force that can produce momentum and act at a distance on the fluid inside the control volume. The Navier-Stokes equations express the conservation of ________________, in partial differential form without making assumptions like inviscid flow or steady state. In the notional T-v diagram shown in Figure 1 above, symbols A and B represent lines of constant ______________. In Figure 1 above, region 2 represents a phase transition region where both _________ and __________ phases coexist at a time. A _______ is the trajectory traced by a single fluid particle as it moves through the flow field over time. By the ______-__________ condition applied to a viscous fluid flow, the velocity of the fluid particles immediately adjacent to the surface is zero relative to the surface. Bernoulli’s equation shows that the sum of the static pressure and the dynamic pressure is constant, and equals the ___________ pressure, which is also known as total pressure. Problems on Next Page Directions: Problems – solve the following problems. Please remember to always state units clearly, maintain units the problem was posed in, show all steps to get to your final answer – which should always be boxed. Show all work, including any equations used; be sure to state any assumptions you make that were not given; identify the numbers you used to solve the equations. To maximize your time (and partial credit), write your solutions as much as possible in terms of variables, and use actual numbers only at the end. (Note: You should reference tables used in order to maximize chances at partial credit). H2O flows into the inlet of a cooling system with temperature 346.85°C and specific internal energy of 2880.9 kJ/kg. In the cooling system, water flows non-uniformly and is cooled isobarically. At the outlet of the cooling system, the water has a density of 842.9 kg/m3. Hint: use tables provided at end What is the phase and pressure of water at the inlet? (10 pts) What is the Temperature of the H2O at the exit of the pipe? (10 pts) Draw a T-v diagram of the process labeling all points and calculate the quality x of the mixture (15 pts) Gas Molec. Weight g A 29 1.4 A group of Georgia Tech engineers are working on an industrial two-stage compressor to provide high pressure air for the manufacturing team. Gas A enters through a circular duct with a diameter of 3 ft at a temperature of 160°F. Additionally Gas A is at 14.2 psi with a velocity of 40 feet/sec. In order to maintain internal temperatures, a water jacketed heat exchanger is installed to the first stage compressor system where cooling water enters the jacket at 60°F and 40 psi at a rate of 25 lbm/s and leaves at 90°F. The compressor system is driven by two individually rotating shafts at 1300 hp for the first stage and 1200 hp for the second stage. During testing, the engineers notice a seal failure in the second stage and observe a leak. The compressor system outputs gas at 300°F and 120 psi with a mass flowrate of 14.82 lbm/s.Assume that the system operates at steady state condition, Gas A is behaving as a calorically perfect gas with the following properties: Determine the mass flow rate of the leak. To receive Full Credit, draw your Control Volume onto the figure. HINT: think about what aspects of the system are relevant for your analysis, it is not difficult if you use the correct Control Volume (CV). Show all work in the same units the problem was posed in, do not change unit systems. (15 pts) A car travels at a constant speed of 27 m/s at sea level. A venturi tube is mounted on the side of the car, where the local air density is . A U-tube manometer filled with mercury is connected between the inlet section and the throat of the venturi. The manometer shows a height difference of 8.0mm of mercury between the two columns. The density of mercury is . Determine the inlet-to-throat area ratio of the venturi. (10 pts) Table D.2: Saturated Liquid and Steam Mixture Table H2O – Pressure increments Table D.3E: Superheated Vapor (Steam), Isobaric Data for P = 0.150 MPa Table D.3F: Superheated Vapor (Steam), Isobaric Data for P = 0.300 MPa Table D.4A Compressed Liquid (Water), Isobaric Data for P = 5.0 MPa Table D.4B Compressed Liquid (Water), Isobaric Data for P = 10.0 MPa
A life tenаnt mаy dо аll EXCEPT:
Jоint tenаncy with right оf survivоrship is risky for fаrm succession becаuse: