A rigid cylinder of volume 0.025 m^3 contains steam at 80 bar and 350^o C. The cylinder is cooled until the pressure is 50 bar. Calculate the state of the steam after cooling and the amount of heat rejected by the steam. Sketch the process on the T-s diagram indicating the area which represents the heat flow. Also sketch the schematic of the system.

A rectangular wing with a NACA 65-210 airfoil section and a chord of 6 in is mounted in the Auburn University 2 ft × 2 ft wind tunnel, completely spanning the test-section. The tunnel is operating with test section velocity, pressure, temperature, and velocity of 1 atm, 520°R, and 75 ft/s, respectively. (a) Calculate the lift, drag, and moment about the quarter-chord when the angle of attack is 5°. (b) What angle of attack would be required to generate a lift of 8 lb?

8. The chapter text describes various materials that have been used to produce casting patterns (i.e., the tooling that is used to produce molds), including Styrofoam, soft woods, hard woods, epoxylurethane polymers aluminum, and iron. For each of these materials, briefly discuss the pros and cons, considering such factors as number of castings to be produced, the size and shape of the casting, the desired precision of the cast product pattern cost, dimensional stability (both wear and environmental factors such as temperature and humidity) susceptibility to damage, ability to be repaired or refurbished, process limitations, and storage concerns

What is the Force analysis for the geneva mechanism?

This is problem 8-7 from El-Wakil’s Powerplant Technology book -- air at 14.696 psia, 40 degF, and with 65 percent relative humidity enters the compressor of a gas turbine cycle. The compressor and turbine have the same pressure ratio of 6 and polytropic efficiencies of 0.8 and 0.9, respectively. Water at 60 degF is injected into the compressor exit air, saturating it. Calculate (a) the air temperature after water injection (b) the percent increase in mass flow rate due to water injection, (c) the compressor work in Btus per pound mass of original air, and (d) the compressor work if water is injected during the compression process to the same temperature as (a), in Btus per pound mass of original air. Use a constant c_p = 0.24 Btu/lb_mdegRankine.

This is problem 7-12 from El-Wakil’s Powerplant Technology book -- it is desired to compare the effect of two types of dry cooling tower systems on powerplant performance. The towers are of the indirect cooling type. One operates with a surface condenser with an 8 degrees Fahrenheit terminal temperature difference, and the other with a direct-contact condenser with 0 degrees Fahrenheit terminal temperature difference. Consider for simplicity a simple ideal Rankine cycle with inlet saturated steam at 1000 psia. Further consider that both have the same condenser cooling water mass flow rate of 7.21x10⁷ lb_m/h, the same inlet temperature of 70 degrees Fahrenheit, the same dry tower air temperature range of 60 degrees Fahrenheit in and 90 degrees Fahrenheit out, and the same air mass flow rate of 5x10⁸ lb_m/h. Calculate for each case (a) the condenser temperature, in degrees Fahrenheit, and pressure, in psia, (b) the steam mass flow rate, in pound mass per hour, (c) the cycle efficiency, and (d) the cycle work, in megawatts, ignoring the pump work.

We would like to have a simple model to describe how temperature changes with time in your classroom during lecture in a typical day in Fall and Spring. You can consider two sets of average air temperature – one in October and other one in April for your analysis. Also, for simplicity, consider the entire room to be at one temperature T. Outside air (Ti,) comes in and reaches the temperature of the room through mixing, and this air leaves at the same rate (?). Consider all the possible modes of heat transfer that can take place through the walls (wall resistance), doors, windows (double pane vs single pane), insulation, and as well as metabolic heat generated by us (typically about 60 W per person). Perform an energy balance for the room from which you can calculate the room temperature, T. You need to account for air properties (density of 1.1769 kg/m3and specific heat of 1006 J/kg.K), room, window, and door dimensions. Consider an average air velocity through the doors as 0.1 m/s needed to calculate air flow rate ?. Ignore temperature variation in the air properties in the room. Assume reasonable parameter values needed for numerical calculations. Our goal is to calculate the classroom temperature at the end of a 75 minute lecture? Also makes some observations between cost and energy savings if you plan to incorporate any improvements.

This is problem 6-12 from El-Wakil’s Powerplant Technology book -- a condensing only feedwater heater uses 7/8-in-OD 90-10 copper-nickel tubes. It receives 84,000 lb_m/h of 95 percent quality bled steam at 20 psia, and 160,000 lb_m/h of drain from the next higher pressure heater at 240°F. 3.9x10⁶ lb_m/h of feedwater goes through the heater at 7 ft/s, 2000 psia, and 195°F. The terminal temperature difference is 5°F. Determine the size, length, and number of tubes based on a U-tube design. Take a maximum allowable stress in the tubes of 15,000 psi.

Calculate the forging force for a solid, cylindrical workpiece made of annealed 1020 steel that is 3.5 in. high and 5 in. in diameter and is to be reduced in height by 30%.  Let the coefficient of friction be 0.15 and ignore the effects of barreling.

What is a sensor? Explain the various types.

Discuss the following types of AGVs and their applications: 2.1 towing machines 2.2 unit load transporters 2.3 pallet trucks 2.4 fork lift trucks 2.5 assembly line vehicles

An FMS consists of three stations plus a load/unload station. Station 1 loads and unloads parts using two servers (material handling workers). Station 2 performs horizontal milling operations with two servers (identical CNC horizontal milling machines). Station 3 performs vertical milling operations with three servers (identical CNC vertical milling machines). Station 4 performs drilling operations with two servers (identical drill presses). The machines are connected by a part handling system that has two work carriers and a mean transport time = 3.5 min. The FMS produces four parts, A, B, C, and D, whose part mix fractions and process routings are presented in the table below. The operation frequency is fijk = 1.0 for all operations. Determine (a) maximum production rate of the FMS, (b) utilization of each machine in this system, and (c) average utilisation of the system U s .

a) Assume that you have two AISI 1045 cylindrical samples with two different diameters: one 1 in. thick and the other 2 in. thick. You astenitize and quench both samples in water. Then you cut a section and measure the hardness at the center of each sample. Would you expect to get the same results? Explain your answer.

b) Assume that you have two cylindrical steel samples with 1 in. diameter, one made out of AISI 1045 and another one made out of AISI 4140. You austenitize and quench both samples in oil. Then you cut a section and measure the hardness at the center of each sample. Would you expect to get the same results? Explain your answer.

At mechanics of metal cutting,

I cannot understand the reason why the shear angle is smaller when the cutting speed is slow.

can you explain this to me?

STAR CCM+

Can someone please explain in your own words the "law of wall " for turbulent flow 3D.

what is wall Y+ value.