Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
In fuel cell stacks, it is desirable to operate under conditions that promote uniform surface temperatures for the electrolytic membranes. This is especially true in hightemperature fuel cells where the membrane is constructed of a brittle ceramic material. Electrochemical reactions in the electrolytic membranes generate thermal energy, while gases flowing above and below the membranes cool it. The stack designer may specify top and bottom flows that are in the same, opposite, or orthogonal directions. A preliminary study of the effect of the relative flow directions is conducted whereby a 150 mm × 150 mm thin sheet of material, producing a uniform heat flux of 100 W/m2, is cooled (top and bottom) by air with a free stream temperature and velocity of 25°C and 2 m/s, respectively.
(a) Determine the minimum and maximum local membrane temperatures for top and bottom flows that are in the same, opposite, and orthogonal directions. Which flow configuration minimizes the membrane temperature?
(b) Plot the surface temperature distribution T(x) for the cases involving flow in the opposite and same directions. Thermal stresses are undesirable and are related to the spatial temperature gradient along the membrane. Which configuration minimizes spatial temperature gradients?
How does the final length of the bar compare with its originallength?
two streams discharge into a pipe as shown. the flows are incompressible. the volume flow rate of stream a into the
A noise temperature of 105 K is measured for the antenna temperature. If the physical temperature of the antenna is 290 K, what is its radiation efficiency?
Assuming that the allowable stress in the wood is 1200 psi, calculate the maximum permissible spacing s of the piles(Hint: Observe that the spacing of the piles may be governed by the load-carrying capacity of either the planks or the piles.
The drag coefficient (Cd) of a semi-tractor trailer without a cab fairing is 0.96,and with the fairing is 0.76 based on frontal area of 80ft^2. if power=Force * velocity, determine the horsepower (Hp) reduction of using the fairing in the truck is go..
in an ore-mixing operation, a bucket full of ore is suspended from a traveling crane which moves along a stationary bridge. the crane is traveling at a speed of 3m/s when it is brought to a sudden stop. Determine maximum horizontal distance throug..
in a single-flash geothermal power plant geothermal water enters the flash chamber a throttling valve at 230 dgrees c
an aluminum cube initially at 400oc with a dimension of 2 cm on each side is cooled using 30oc air with a convection
A piston-cylinder device contains 2 ft3 of saturated water vapor at 50-psia pressure. Determine the temperature and the mass of the vapor inside the cylinder.
a single plate clutch consists of a pair of contacting surfaces. the inner and outer diameters of the friction disk are
Compared to cross-linked polymers, linear polymer chains:
when air is released adiabatically from a tire the temperature of the air at the nozzle exit is 37 degrees celsius
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd