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Air at 27°C with a free stream velocity of 10 m/s is used to cool electronic devices mounted on a printed circuit board. Each device, 4 mm × 4 mm, dissipates 40 mW, which is removed from the top surface. A turbulator is located at the leading edge of the board, causing the boundary layer to be turbulent.
(a) Estimate the surface temperature of the fourth device located 15 mm from the leading edge of the board.
(b) Generate a plot of the surface temperature of the first four devices as a function of the free stream velocity for 5 ≤ u∞ ≤ 15 m/s.
(c) What is the minimum free stream velocity if the surface temperature of the hottest device is not to exceed 80°C?
The loads are service loads, and the distributed load includes the beam weight. The clear span is 24′-4″. Use f′c = 4000 psi; the reinforcing steel is A615 Grade 60. Design shear reinforcing for the beam.
steam at 5 mpa and 600oc enters an adiabatic turbine and expands to 50kpa at a mass flow rate of 10000kghour. the
A rigid rod of negligible mass and length 2l is pivoted at the middle point and is constrained to move in the vertical plane by springs and masses, as shown in Fig. 5.42. Find the natural frequencies and mode shapes of the system.
During an experiment, an aerospace engineering student measures a wind tunnel's velocity N times. The student reports the following information, based on 90% confidence, about the finite data set: mean velocity=25 m/s, velocity standard deviation=1.5..
What is the projected impact on the per unit demanufacturing cost of a 50% increase in training costs coupled with a 90% increase in transportation costs? What is the revised cost reduction percentage?
The shaft is hollow of external diameter 75 mm and in4ternal diameter 40 mm. The density of the shaft material is 7700 kg/m3 and its modul us of elasticity is 200GN/m2. Find the lowest whirling speed of the shaft, taking into account the mass of t..
the acceleration of a particle is defined by the following relation where a is a constant. at t0 the position of the
on a cloudless day the sunlight that reaches the surface of the earth has an intensity of about 1.2 103 wm2. what is
One 110kg foot ball lineman is running in the direction of x-ax is at 2.75 mis while another 125 kg lineman is running directly toward him at 2.60 mis. What are the magnitude and direction of the net momentum of these two athletes and their total ..
two tanks are connected by a valve. tank a contains air at 200 kpa volume of a 0.5 m3 and temperature of a 30oc. tank
Determine the resulting stress equations for σx, σy and τxy given the Airy's stress function ? = a1x^4 + a2(x^3)y + a3(x^2)(y^2) + a4x(y^3) + a5(y^4), where ai are constants. Also determine, if any, the restrictions between constants.
It is also known that the normal strains in the x and y directions are x= 713.8 × 10-6 (elongation) and y = - 502.3 × 10-6 (shortening). What is the bulk modulus K for the aluminum?
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