Q: In regions far from the entrance, fluid flow through a circular
In regions far from the entrance, fluid flow through a circular pipe is one dimensional, and the velocity profile for laminar flow is given by u(r) = umax(1 − r 2/R2), where R is the...
See AnswerQ: Rooms with floor areas of up to 15 m2 are cooled adequately
Rooms with floor areas of up to 15 m2 are cooled adequately by window air conditioners whose cooling capacity is 5000 Btu/h. Assuming the COP of the air conditioner to be 3.5, determine the rate of he...
See AnswerQ: Repeat Prob. 10–28 for umax = 6 m/
Repeat Prob. 10–28 for umax = 6 m/s. Data from Prob. 10-28: In regions far from the entrance, fluid flow through a circular pipe is one dimensional, and the velocity profile for lam...
See AnswerQ: Consider a steady-flow Carnot refrigeration cycle that uses refrigerant-
Consider a steady-flow Carnot refrigeration cycle that uses refrigerant-134a as the working fluid. The maximum and minimum temperatures in the cycle are 30 and −20°C, respectively. The quality of the...
See AnswerQ: Consider an ice-producing plant that operates on the ideal vapor
Consider an ice-producing plant that operates on the ideal vapor-compression refrigeration cycle and uses refrigerant 134a as the working fluid. The refrigeration cycle operating conditions require an...
See AnswerQ: Consider the flow of air over the wings of an aircraft.
Consider the flow of air over the wings of an aircraft. Is this flow internal or external? How about the flow of gases through a jet engine?
See AnswerQ: Someone claims that the absolute pressure in a liquid of constant density
Someone claims that the absolute pressure in a liquid of constant density doubles when the depth is doubled. Do you agree? Explain.
See AnswerQ: A heat pump that operates on the ideal vapor compression cycle with
A heat pump that operates on the ideal vapor compression cycle with refrigerant-134a is used to heat a house. The mass flow rate of the refrigerant is 0.25 kg/s. The condenser and evaporator pressures...
See AnswerQ: A frustum-shaped body is rotating at a constant angular speed
A frustum-shaped body is rotating at a constant angular speed of 200 rad/s in a container filled with SAE 10W oil at 20°C (μ = 0.100 Pa⋅s), as shown in Fig....
See AnswerQ: A large refrigeration plant is to be maintained at −15°
A large refrigeration plant is to be maintained at −15°C, and it requires refrigeration at a rate of 100 kW. The condenser of the plant is to be cooled by liquid water, which experiences a temperature...
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