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Derive 3-D non-steady state conduction equation in spherical co-ordinates. Explain the assumption involved.
The hot combustion gases of a furnance are divided from the ambient air and its surroundings, which are at 25 oC, by a brick wall 0.15m thick. The brick has a thermal conductivity of 1.2W/mk and a surface emissivity of 0.8 . Under steady state conditions an outer surface temperature of 100 oC is calculated. Free convention heat transfer to the air adjoining the surface is divided by a convection coefficient of 20W/m2k. what is the brick inner surface temperature?
Determine the percentage savings in the material: A hollow shaft containing an inside diameter 0.5 times the outer diameter is to replace the solid shaft of the similar materi
Design a hydrocooling unit that can cool fruits and vegetables from 30 to 5 degrees Celsius at a rate of 20,000 kg/hr under the following conditions: The unit will be of flood typ
LASER SURFACE TREATMENT APPLICATIONS The laser can be used to alter the surface structure of materials either with or without alloying additions as compared to alloying by
These are differentiated from hoists by the fact that the operator rides with the load. There are many different types of drives for such elevators but in general electric
Induction Pressure Welding In this process, the current is induced by high frequency induction process in the job. Due to electrical induction the job is heated. When a suitabl
Necessity of Transmission System The main purpose of Transmission system is to provide a means to vary the torque ratio between the engine and the road wheels. It means th
Draw the P-h and T-S diagram for the vapour compression cycle when the vapour after compression is : (i) wet region (ii) dry saturated
The pressure and temperature of a diesel cycle at the start are 1 bar and 20C respectively and the compression ratio is 14. The pressure at the end of expansions 2.5 bar. Find perc
Battery Electrolyte and Gases Battery emits explosive gases, keep sparks and flames away. Ensure adequate ventilation while charging the battery. Brake Fluid Spilling
When a Plano-convex lens of large radius of curvature is placed on a glass plate with its convex surface, a thin air film of gradually increasing thickness is formed between the up
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