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Heat Transfer A blacksmith wants to forge a 30 cm long metal bar. The initial temperature of the bar is at 1100oC. The surrounding air temperature is 23oC. He is wondering if he could get prediction on the time required and the region that is ready for hammering. To help the blacksmith, you've been asked to solve the case of 1-D unsteady heat conduction and you end up with the following general solution: (Material: Pyrolytic graphite; Thermal diffusivity: 1220 mm²/s) Where Fourier number FO = a.
a four cylinder 2.4 liter engine operates on a four stroke cycle at 3200 rpm. the compression ration is 9.41 the
A thin long electric heater of width 20 cm is placed with its width oriented vertically. It dissipates heat by free convection from both sides of its surface into air at 20C. If the heater should not exceed 225C, determine the length of the heater in..
a lake can freeze even if the temperature is above freezing. assuming a gentle breeze wind produces a convective heat
a 1-mm-thick bcc iron foil is used to separate a region of high nitrogen gas concentration of 0.1 atomic percent from a
A counter flow cooling tower cools 2000 gal/min water from 104 F to 85 F with 210,000 ft^3/min of air at 90 F Dry bulb Temperature and 76 F WBT . The Mass transfer coefficient -surface area product is hA= 123lbm/hr ft^3. Air mass flow rate per unit c..
a 4 kw motor is driving an oil pump with an efficiency of 95 down a 10 mm diameter pipe. if the velocities of the fluid
a 2mm diameter metor of specific gravity 2.9 has a speed of 6 kms at an altitude of 50000m where the density of air is
air enters a compressor at 300 k and 100 kpa at a volumetric flow rate of 4 m3s. the air is compressed such that the
Capture the Rayleigh line between Mach number 0.2 to 4.0 initially by adding heat q in small increments taking the flow to M = 1 at location 2, there after removing heat until you achieve M = 4. Use the differential equations
A block is L = 1 [m] long and h = 0.5 [m] tall and weighs 50 [N]. The box is allowed to rotate about point A. A rope is attached to the upper left corner. This rope makes a θ=40° angle from the horizon. A horizontal force of 30 [N] is applied at th..
determine the heat transferred and the work done both in kjkg when saturated water vapor in a closed system is
A hypersonic gun tunnel is used to generate short-duration, high-speed flows and typically consists of two cylindrical volumes separated by a diaphragm. One end of the tunnel (the driver end) is pumped to a high pressure, while the other end (the dri..
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