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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?
The x and y components of velocity for a two-dimensional flow are u = 5y ft/s and v = 4 ft/s, where y is in feet. Determine the equation for the streamlines. Use C as constant. Round all numbers in answer to 3 significant digits.
a well-insulated rigid tank of volume 10 m3 is connected by a valve to a supply line carrying air at 227oc and 10 bar.
superheated steam at 15 mpa and 600 c enters the turbine of a steam power plant and is expanded to an exit pressure of
A v-belt drive system consists of a 12.4" diameter driving sheave and a 21.1" diameter driven sheave connected by a 5V belt. if the center distance is to be no more than 38" specify the longest possible standard belt that can be used and what the res..
an adiabatic air compressor is to be powered by an adiabatic steam turbine. steam enters the turbine at 12.5 mpa and
In order to double check your speedometer on your boat you decide to install a pitot tube on the bottom. One tube protrudes straight downward, while the other tube has a 90 degree bend, pointing the tip into the direction of motion. At rest, the wate..
Consider a bone plate made of randomly oriented fibers in three dimensions. The fiber and matrix materials are carbon fiber and PMMA. Assume carbon fiber has a modulus of 500GPa and PMMA's elastic modulus is 3 GPa.
A thermocouple with a sensitivity of 0.0225 /o mV F is used to measure temperature with a 16-bit A/D converter. If the full scale voltage of the A/D converter is 100 mV, What is the lowest temperature resolution? What is the range of temperature can ..
that makes p1 and p2 both equal to atmospheric pressure. the flow rate in the tank and the tube are proportional to the
a woman with wieght 637n lies on a bed of nails. the bed has a weight of 735n and a lenght of 1.72m. the bed is held up
A connection of rod of 50 mm diameter has a rectangular block 50 mm wide and 25mm thick forged at its end. A turned radius of 25 mm joins the rod and the block. Draw the projections of the rod showing curves of intersection.
warm air is contained in a piston-cylinder assembly oriented horizontal as shown in figure p.142. the air cools slowly
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