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Refrigerant 134a at a flow rate of 0.5 lb/s enters a heat exchanger in a refrigeration system operating at steady state as saturated liquid at 20 degrees Fahrenheit at a pressure of 20lbf/in^2. A separate air stream passes in counter flow to the refrigerant 134a stream, entering at 120 degrees Fahrenheit and exiting at 77 degrees Fahrenheit. The outside of the heat exchanger is well insulated. Neglecting kinetic and potential energy effects and modeling the air as an ideal gas, determine the mass flow rate of air, in l
the temperature of a flowing gas is to be measured with a thermocouple junction and wire stretched between two legs of
a cross section of a rotating bearing is shown. the spherical member rotates with angular speed omega a small distance
a silicon wafer with thickness of 925 microm is being heated with a uniform heat flux at the lower surface. the silicon
Sketch crystallographic planes with the following Miller-Brava is indices in a hexagonal unit cell: (a) 1(Bar)101 ; (b) 2(Bar)112 . Mark the origin and axes. Explain your answers.
a 3 cm diameter bar 3 m long is attached to two walls on either end of the bar. the walls are at a temperature of 100
thermopane window consists of two 6 -mm thick glasses separated by a stagnant air space of thickness 6 mm. the thermal
question 1 a force of 750 n acts on point a in the x direction where the cables ab ac and ad are joined as shown in
Steam enters a counter flow heat exchanger operating at stead state at 0.07 MPa with a specific enthalpy of 2431.6 kJ/kg and exits at the same pressure as saturated liquid. The steam mass flow rate is 1.5 kh/min. A separate stream of air with mass fl..
Air is initially at a temperature of 500 K and a pressure of 100 kPa. A process occurs so that the specific internal energy of the air increases by 200 kJ/kg (i.e. u2 - u1 = 200 kJ/kg). Modeling the air as an Ideal Gas, determine the final temperatur..
A person with no experience in fluid mechanics wants to estimate the friction factor for a 1 in diameter galvanized iron pipe at a Reynolds number of 8000. The person finds the equation f = 64/Re. Explain the problem with this approach and estimate t..
consider nitrogen gas contained in a piston-cylinder device. the cylinder diameter is 150 mm. at the initial state the
An important concept in using CFD code to solve the Navier-Stokes equations is that the variables set that are solved for are the ones appearing in the time derivative terms. These are called conservative variables. An expression for pressure, P, in ..
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