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Thermal spelling: The breaking or cracking or peeling off the refractory is known as spelling. A good refractory must show a good resistance to thermal spelling. Thermal spelling can be decreased by minimizing the development of internal stress by:
(1) Using refractory with high porosity, good thermal conductivity and low coefficient of expansion.
(2) Avoiding sudden temperature changes.
(3) Proper furnace design
Emulsification: Emulsification can be defined as the property of oils to get intimately mixed with water easily. Emulsions can be oil in water emulsion or water in oil emulsion. C
Properties of good refractory material: The requirements of refractories for different furnaces and heating places depend on the working conditions. Nature of slag formed, maximum
The similar system is now heated in two stages, by rst contacting with a reservoir at T2 halfway among T1 and Tf , then by contacting with the reservoir at Tf . Again and the ent
Different types of breakdown: (i) Intrinsic breakdown ] (ii) Thermal breakdown (iii)Defect breakdown
An enclosure haves Helium at a pressure of 1.3 atm and has two vertical heating surfaces, which are keeps at 80 and 20 oC respectively. The vertical surfaces are 40x40 cm and are s
merits and demerits of electrostatic sheilding.
A system with constant heat capacity CP and initial temperature T1 is heated by contacting a reservoir at Tf . Find the entropy change of the system, reservoir, and system plus res
A double riveted double cover butt joint is used for connecting plates 1.2 cm thick. The diameter of the rivets is 2.2 cm. The permissible stresses in tension - 100 N/mm2 The per
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Explain Dipole Relaxation Dipole Relaxation is the method, occupying a specific period of time after a change in the applied electric field, in which the orientation polariza
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