5 of industrial examples : with picture

-tensile spring

- toresion spring

5 of industrial examples :(with photo)

-compression spring

The project is to "Design and build an experiment to verify the first law of thermodynamics by stirring air with an electric motor powered paddle, in a well-insulated container." We are planning on finding the work of the motor and seeing if it equal to the change in internal energy of the container. The only problem is that we are confused on how to find the internal energy. What would be the best/easiest way to solve this? Also since the containor is well insulated does that mean that the deltaQ would equal 0?

Thank you very much!

A small gas bubble grows in a large container of a Newtonian fluid. As the bubble grows, it pushes liquid away radially. We can ignore the inertia in the liquid, i.e. Re is small. By solving for the flow in the liquid and using the boundary condition at the bubble/liquid interface, we can determine how the bubble growth rate, i.e. the bubble radius R as a function of time, depends on the pressure in the bubble and liquid parameters.

a) Use the continuity equation to find the form of the radial velocity profile in the liquid.

b) Substitute your result into the r-component of the Stokes equation to show that the pressure in the liquid is constant everywhere! Call that pressure p?.

c) write the boundary condition at the bubble/liquid interface, i.e. at r = R. Hint: ignore surface tension so that the condition at the interface becomes the normal stress ?rr must be continuous there. The normal stress on the bubble side is ?rr = -pb, where pb is the pressure inside the bubble.

Is there a way to design an experiment to calculate the total amount of weight or force a material (such as fabrics/toilet paper) can support before breaking that does not revolve around the usage of tensile strength test or extremely large masses? Can we design an experiment that can be small scaled?

Cantor Corp. is the country’s third largest manufacturer of garden furniture and accessories. They are planning to sell a new oak and cast iron bench that will be available in a choice of three colors. Part of the manufacturing process requires the iron handrails to be spray-painted. As this is a new process for the company, they will have to create workstations adequate to the task. Their first step is to design a local exhaust ventilation system. 1. What are the major elements of such a system? 2. Which hood type should they use for their local exhaust ventilation system and why 3. What special room conditions are critical for this type of hood? 4. In general, what are the other types of hoods utilized in a local ventilation system? An important step in the system design is to determine whether an air cleaner is needed to reduce the amount of contaminants discharged to the environment. 5. What factors determine the type of cleaner needed? 6. What type would you select for the spray painting job? Management is concerned about their ability to supply adequate makeup air so that they don’t become air bound. 7. What are the important features to keep in mind when designing a makeup air system?

Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 lb/s and is compressed adiabatically to 650 lbf/in.²


If the power input is 2150 hp, determine for the compressor:

(a) the percent isentropic compressor efficiency and

(b) the rate of entropy production, in hp/°R.

Ignore kinetic and potential energy effects.

Design an ECBM system with methane recovery, electricity generation, and carbon sequestration for a coal field with 17 billion m3 methane capacity and a yield of 280 m3/tonne CO2 sequestered. The methane (assume it is pure CH4 and ignore impurities) is delivered to an advanced technology-generating plant where it is mixed with a stream of pure oxygen to deliver electricity for the grid, CO2 for sequestration, and water as a by-product. Of the energy available in the methane, 40% is delivered to the grid in the form of electricity. The remainder is dissipated in losses in the plant and to supply energy needed for the operation (methane, CO2 and water pumping, CO2 injection, and so on). All CO2 from the generating plant is injected into the coal field, so that there are no emissions of CO2 to the atmosphere. Additional CO2 is transported by pipeline from other sources located at a distance. The plant is planned to operate for 40 years at a constant output, after which all the methane will have been withdrawn. How much electricity does the plant produce per year? What is the net amount of CO2 sequestered, after taking into account the fraction that is derived from carbon that was under the ground in the first place?

Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine at 15 MPa and 600°C. The steam condenses in the condenser at 10 kPa. Use the EES software to study the effects of the following cases on the cycle performance and to sketch the T-s diagram for each case:

Plot the variation of the cycle thermal efficiency with the turbine isentropic efficiency. Take the isentropic efficiency of the turbine in the range 70% to 100%.

If the cycle is modified to the ideal reheat Rankine cycle with the same pressure limits and same maximum temperature, Plot the variation of the steam quality at the turbine exit and the thermal efficiency with the reheat pressure. Take the range of the reheat pressure from 3 to 8 MPa.

If the cycle is modified to the ideal regenerative Rankine cycle with the same pressure limits and same maximum temperature, plot the variation of the thermal efficiency with the extraction (bleeding) pressure ranging from 1 to 3 MPa, with a step of 0.5 MPa.

The heat is supplied to the boiler from a heat source (e.g. furnace) of a constant temperature. For the same pressure limits and same maximum temperature of the cycle, plot the variation of the second law efficiency with the heat source temperature ranging from 700 to 1200 K. In addition, show the variations of the exergy destroyed in each component of the cycle (boiler, turbine, condenser, pump) with the heat source temperature and identify the rooms of improvement in the second-law efficiency

it should be solved by ees.....

A Rankine cycle (not an ideal cycle) generates steam (H2O, Water) at 100 bars
and 640 oC (state 3) and the turbine-exhaust pressure is 0.08 bar (state 4). The enthalpy value
of the turbine outlet is 2577.0 kJ/kg (state 4). Assuming the state of the inlet of pump is a
saturated liquid and kinetic and potential energy changes are negligible, a pump operates
isentropically and it has a steady state mass flow rate of 23,740 kg/h through it. Determine
a. The temperature of the inlet pump (state 1), in oC,
b. The enthalpy of the inlet pump (state 1), in kJ/kg,
c. The entropy of the inlet pump (state 1), in kJ/(kg*K),
d. The entropy of the inlet boiler (state 2), kJ/(kg*K),
e. The enthalpy of the inlet boiler (state 2), kJ/kg,
f. The temperature of the inlet boiler (state 2), oC,
g. The enthalpy of the inlet turbine (state 3), kJ/kg,
h. The entropy of the inlet turbine (state 3), kJ/(kg*K),
i. The entropy of the inlet condenser (state 4), kJ/(kg*K),
j. The temperature of the inlet condenser (state 4), oC,
k. The adiabatic efficiency of the turbine, in percent, %
l. The power input into the pump, MW,
m. The rate of heat transfer into the working fluid as it passes through the boiler, MW,
n. The power output by the turbine, MW,
o. The rate of heat transfer into the working fluid as it passes through the condenser, MW,
p. The thermal efficiency, %

The strains of prismatic beam made of extruded polycarbonate were measured using multiple strain gauges. When loaded at room temperature, normal strains are 200us and 100us, while the shear strain is 45us. The modulus of elasticity is 2.38GPa, the mass density is 1200kg/m3 , the glass transition temperature is 147°C, and the shear modulus is 0.96GPa. Determine all six independent components of the stress tensor. Clearly list all your assumptions.

Complete combustion of 1 kmol of PROPANE GAS with 0% excess air produces (?????) kmol of carbon-dioxide gas. (enter a decimal number)

A C-D nozzle is to be designed to produce a flight Mach number of 3.0 for the atmospheric conditions (pressure and temperature) at 15 km altitude in the test section of a supersonic wind tunnel. The diameter of the test section is 10 cm. Assume the gas has Y(gamma) = 1.4 and R = 2.077 kJ/kg*K, determine (a) the mass flow rate that must be provided, (b) the nozzle throat area, (c) the reservoir temperature and (d) the reservoir pressure.

Determine the final temperature and pressure of a mixture of CO₂ (MW=44) and nitrogen if 3 kg of CO₂ at 20°C and 1.5 MPa is mixed with 1 kg of nitrogen at 100°C and 0.75 MPa. Use c_v of CO₂ as 0.656 kJ/kg K and c_v of nitrogen as 0.752 kJ/kg K. The process can be considered to be adiabatic.