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Water flows through a 2 cm diameter pipe at 1.6 m/s. Calculate the Reynolds numberand find also the velocity required to give the same Reynolds number when the pipe istransporting air. For the water the kinematic viscosity was 1.31*10^-6 m^2/s and the density was 1000 kg/m^3. For air those quantities were 15.1 10-6 m^2/s and 1.19 kg/m^3.
the cramster solution uses a formula that the book derived form the circle. however the point of this exercise was to
An ideal Ericsson engine using helium as the working fluid operates between temperature limits of 550 and 3000 R and pressure limits of 25 and 200 psia. Assuming a mass flow rate of 14 lbm/s determine
A heat pump operates at steady state maintains a house at 22 0C when the outside is -22 0C using 15 kW of power. The manufacturer claims that the power input required is 3.2 kW. Applying energy and entropy rate balances evaluate the claim.
pump a can empty a tank in four hours while pump b takes only three hours to empty the tank. how long will it take to
A 3.31 ft3 rigid tank contains saturated refrigerant-134 at 100psi. Initially, 14 percent of the volume is occupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowed to escape slowly from the tank. He..
a consulting firm is contemplating the purchase of a btu meter to measure the cooling loads on chillers at a purchase
Water, initially a saturated liquid at 100 C, is contained in a piston–cylinder assembly. The water undergoes a process to the corresponding saturated vapor state, during which the piston moves freely in the cylinder.
heat transfer from a certain stationary system occurs at a rate of 50 kw. if the system performs work at a rate of 41
Transverse Shear Stress variation with changes in point load position - Determine Q factor at 3 the points and calculate the Transverse Shear Stress
Consider a saturated clay layer of 4 m thickness on top of a deep layer of stiff sand. The clay has an initial porosity n=40%. Following a lowering of the water level in the clay, the clay porosity is reduced to 30%. What is the change of thickness S..
A piston-cylinder contains 50 L of saturated liquid R-134a. The piston is frictionless, and has a mass and area resulting in an applied pressure of 500 kPa on the refrigerant. The refrigerant is now heated until its temperature rises to 70 °C. Calcul..
The combustion products also include H2O, H2 and N2, exit the exhaust at 1000 K. Heat loss from the engine (primarily to the cooling water) is 120 kW. What is the power output of the engine? What is the thermal efficiency?
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