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A computer code is being developed to analyze a 12.5-mm-diameter, cylindrical sensor used to deter- mine ambient air temperature. The sensor experiences free convection while positioned horizontally in quiescent air at Too = 27°C. For the temperature range from 30 to 80°C, derive an expression for the
(a) Neglecting radiation heat loss, calculate the heat flux qe" that must be supplied by the electrical tape to ensure a uniform fluid temperature.
(b) Assuming the emissivity of the tape is 0.95 and the surroundings are also at 15°C, calculate the required heat flux.
(c) The heat loss may be reduced by wrapping the heating tape in a layer of insulation. For 85% mag- nesia insulation (k = 0.050 W/m · K) having a sur- face emissivity of s = 0.60, compute and plot the required heat flux qe" as a function of insulation thickness in the range from 0 to 20 mm. For this range, compute and plot the convection and radia- tion heat rates per unit tube length as a function of insulation thickness.
the ice cap at the north pole may be 1000 m think with a density of 920 kgm3. find the pressure at the bottom and the
steam having a specific enthalpy of 160 kjkg and pressure of 1 kpa enters as adiabatic pump. upon leaving the pump the
A 10-C wind blows over 6-mm-diameter high-tension wires. Determine the range of velocities over which vortex shedding occurs. Could the shedding frequency be heard?
at a ski resort water at 40 f is pumped through a 3-in diameter 2000ft long steel pipe from a pond at an elevation of
An autoclave contains 1000 cans of pea soup. It is heated to an overall temperature of 100°C. If the cans are to be cooled to 40°C before leaving the autoclave, how much cooling water is required if it enters at 15°C and leaves at 35°C? The speci..
a 20-lb force is applied to the control rod ab as shown. knowing that the length of the rod is 9 in. and that alpha 25
steam is expanded from 20 bars 280 c to 100kpa through an adiabatic steady flow turbine whose isentropic efficiency is
the wheel on a press is 25 inches in circumference and there are 5 threads to the inch. how much resistance on the book
two particles a and b are travelling around a circle of redius 2m in opposite directions. the velocity of particle a
consider the following probability distribution function for a continuous random variablefx 3x6235 -2ltxlt-3
In order to increase production rate a reactor set point was increased from 160 psig to190 psig. The reactor pressure transmitter was recalibrated from 0-200 psig to 0-300 psig.
a gold processor has three mines of gold ore mine a mine b and mine c. in order to keep his plant running at least 200
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