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1. Refrigerant-134a is being transported at 0.1 kg/s through a Teflon tube of inside diameter Di = 25 mm
is to maximize qc" while maintaining the heat sink at an acceptable temperature. Subject to prescribed and outside diameter Do = 28 mm, while atmospheric values of L = 12 mm and Tm,i = 290 K and the constraint that Ts,max 50°C, explore the effect on qc" of variations in heat sink design and operating conditions.
2. One way to cool chips mounted on the circuit boards of a computer is to encapsulate the boards in metal frames that provide efficient pathways for conduction to sup- porting cold plates. Heat generated by the chips is then dissipated by transfer to water flowing through pas- sages drilled in the plates. Because the plates are made from a metal of large thermal conductivity (typically aluminium or copper), they may be assumed to be at a temperature, Ts,cp. air at V = 25 m/s and 300 K is in cross flow over the tube. What is the heat transfer per unit length of tube to Refrigerant-134a at 240 K?
A cylinder fitted with a piston containing 1kg of Refrigerant 134a at 20C and 90% vapor quality is attached to a line flowing Refrigerant 134a. The total force on the piston is proportional to the cylinder volume squared.
At a given temperature, a hypothetical isomorphous A-B alloy of composition 40wt% B - 60wt% A is found to be 66wt% (B) alpha phase and 34wt% liquid phase, L. If the composition of the alpha phase is 13wt% B - 87wt% A, what is the composition of the l..
Derive the expression for a simple spring mass system equation and its response. Plot the response for 3 different values of k, (k=1, k=10, k=100) assume mass M= 1, what are the natural frequencies in rad/sec and Hz for each case. Explain the differe..
a coin placed 30.8 cm from the center of a rotating horizontal turntable slips when its speed is 51.2 cms.a what force
Calculate the force on a wall subjected to a two-phase jet that has the following parameters:
Determine the shear stress and normal stress on infinitesimal elements D and E shown in a structural member below. Point D is at the top surface and point E is at the front surface. The structural member is fixed at the left end and subjected to a ve..
after a combustion process in a cylinder the pressure is 1200 kpa and the temperature is 350 c. the gases are expanded
Saturated water vapor at 100 kPa enters a counter flow heat exchanger operating at steady state and exits at 20C with a negligible change in pressure. Ambient air at 275 K, 1 atm enters in a separate stream and exits at 290 K, 1 atm.
a turbine operating under steady flow conditions receives steam at the following state pressure 13.8 bar specic volume
A 1 m steel rod (circular cross-section) has a diameter of 2 cm and is pulled in tension with a load of 50 kN. The steel rod experiences an entirely elastic elongation of 1 mm. a) Calculate the elastic modulus of the steel. b) Calculate the diameter ..
describe external threading operations. explain the external threading operation in details. why is it important to
what does it mean when a steel cable is required to have a factor of safety of at least 5 against its ultimate load?
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