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Consider a horizontal, D = 1-mm-diameter platinum wire suspended in saturated water at atmospheric pressure. The wire is heated by an electrical current. Determine the heat flux from the wire at the instant when the surface of the wire reaches its melting point. Determine the corresponding centerline temperature of the wire. Due to oxidation at very high tempera- ture, the wire emissivity is s = 0.80 when it burns out. The water vapor properties at the film temperature of 1209 K are pv = 0.189 kg/m3, cp,v = 2404 J/kg · K, vv = 231 X 10-6 m2/s, kv = 0.113 W/m · K.
this would provide you with a set of Reynolds numbers. Next, using the integral method, determine the velocity profiles within the boundary layer to be followed by determination of the heat transfer coefficient values for your selected Reynolds numbe..
the boat is to be pulled onto shore using two ropes. If the resultant force is to be 1000 N, directed along the keel aa , determine the magnitude of forces T, P acting in each rope at the angle teta of P so that the magnitude of P is minimum. T ac..
the pressure of a gas inside a piston-cylinder device is initially balanced by an atmospheric pressure of 100kpa and an
a furnace wall is composed of three layers 15 cm of firebrick k 1.5 wmk followed by 22.5 cm of kaolin insulation brick
For this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of 6.0mm.
question in an em wave traveling north the e field oscillates vertically and has a frequency of 85.0 khz and an rms
A 2.4-N force is applied to the plunger of a hypodermic needle. If the diameter of the plunger is 1.3 cm and that of the needle 0.20 mm,
a coast guard cutter detects an unidentified ship at a distance of 19.6 km in the direction 17.8deg east of north. the
1.8 ft3lb of ammonia at 130f is a two-phase liquid-vapor mixture. determine the quality of a two-phase liquid mixture
a for pt at 20 c calculate how many unit cells there are per cubic meter.bhow many total interstitial sites are there
A steady flow air compressor compresses 50 lb/min from 14 psia and 80 degrees F to a discharge state at 45 psia and 300 degrees F. Heat departs from the air only via circulating water that enters the jacket at 75 degrees F and leaves at 95 degrees..
A helmet has an open cell polystyrene foam liner that is design to absorb the kinetic energy from an impact. The Foam has a relative density of 10% and the young module of the solid polystyrene that the foam is 1.5Gpa. How much energy per volume in J..
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