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A fruit juice containing 30% solids of molecular weight 100 g was placed in a tray (length =100 cm, height = 90 cm, width = 8 cm) in the freezer that uses propylene glycol that is at -30 C(celsius). The convective heat transfer coefficient between the product and the glycol is 200 W/m^2 K. If the specific heat,density, and thermal conductivity of the unfrozen product are 4000 J/kj K, 950 kg/m^3 and 0.5 W/m K respectively and that of the frozen product are 3900 J/kg K, 900 kg/m^3 and 1.6 W/m K respectively, Determine the time taken for the product to freeze if it is at its initial freezing point when it was placed in the blast freezer.
some aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 35 mpa ?m.
a 600 mm diameter wheel rolls without slipping on a horizontal surface as shown. rod ab is attached to the wheel at a
five kilograms of water at saturated liquid phase fills in a piston-cylinder device at 150oc. the device is now heated
a 1kg mass connected to a horizontal spring of stiffness 1031 nm has a dry-sliding friction force of 2 n. the mass is
a two-stage air compressor operates at steady state compressing 10 m3min of air from 100kpa 300 k to 1200 kpa. an
an automobile having a mass of 2000 kg deflects its suspension springs 0.02 m under static conditions. Determine the natural frecuency of the automobile in the vertical direction by assuming dumping to be negligible.
a closed gas turbine unit uses neon as the working fluid. there are two stages of compression with intercooling from
1. with reference to basic constructional features contrast the methods of compression employed by positive
Design of absorption column and the cooler. Process design of other units should be completed along with pipe sizes.
Determine the Final Velocity, An object whose mass is 1 lb has a velocity of 100 ft/s. How would I determine the final velocity, in ft/s, if the kinetic energy of the object decreases
a contractor is required to prepare a soil surface so that its planar and the normal direction to the surface is within
an insulated tank containing 0.4 m3 of saturated water vapor at 500kpa is connected to an initially evacuated
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