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Consider the Nichrome wire (D = 1 mm, ρe = 10-6 Ω· m, k = 25 W/m· K, ε = 0.20) used to fabricate the air heater of Problem 3.86, but now under conditions for which the convection heat transfer coefficient must be determined.
(a) For atmospheric air at 50°C and a cross-flow velocity of 5 m/s, what are the surface and centerline temperatures of the wire when it carries a current of 25 A and the housing of the heater is also at 50°C?
(b) Explore the effect of variations in the flow velocity and electrical current on the surface and centerline temperatures of the wire.
In a lecture demonstration, a professor pulls apart two hemispherical steel shells (diameter D) with ease using their attached handles. She then places them together, pumps out the air to an absolute pressure of p, and hands them to a bodybuilder ..
during a plant visit it was noticed that a 12-m-long section of a 12-cm-diameter steam pipe is completely exposed to
Propane at 8 bars and 80oC is contained in a closed, rigid vessel with a volume of 10 m3 . Its temperature drops due to heat transfer to the surroundings. Determine (a) the temperature at which condensation first occurs and (b) the fraction of the to..
Compute the vector magnetic potential within the outer conductor for the coaxial line whose vector magnetic potential is shown in Figure 7.20 if the outer radius of the outer conductor is 7a. Select the proper zero reference and sketch the results..
1. a househusband is steaming beef for his family in a pan with a surface area of 23.544 cm2 that is covered with i a
The cord is attached to the pin at C and passes over the two pulleys at A and D. The pulley at A is attached to the smooth collar that travels along the vertical rod. Determine the velocity and acceleration of the end of the cord at B if at the ins..
A turbine receives steam at 6MPa, 600 C with an exit pressure of 600 KPa. Assume the turbine is adiabatic and neglect kinetic energies. Find the exit temperature and the specific work
The double pulley consists of two parts that are attached to one another. It has a weight of 50 lb and a centroidal radius of gyration of kO = 0.6 ft and is turning with an angular velocity of 20 rad> s clockwise. Determine the kinetic energy of t..
water flowing in a line at 60 lbfin2 saturated vapor is taken out through a valve at 14.7 lbfin2. what is the
a ceramic has k0.8 wmk. if this ceramic is shaped into a cylinder with a porosity distribution given by p.1xl1-xl where
a force of f 1.00 7.00n is applied to an object that is pivoted about a fixed axis aligned along the z coordinate
Determine the entropy production rate and heat transfer in a newly designed valve with 1.10 kg/s of an incompressible hydraulic oil flowing through it.
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