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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
What are the objectives of annealing? Annealing , is a heat treatment where in a material is altered, causing alters in its properties like as strength and hardness. It is a p
A) A horizontal tube having a 1.25 cm outside diameter is submerged in a water 1 atm and 100 oC. Determine the heat flux for the surface temperature of (a) 540 o C, (b) 650 o C,
Mass transfer coefficients can be of either local or overall type. a. Describe carefully what the local and overall mass move coefficients show. b. How does the concentration
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Hardness is 160 ppm and flow rate is 40 m3/hr ,I want to know the amount resin quantity required.Please give me a solution with details.
Outline a procedure for photolithography in the fabrication of electronic devices. What are the limitations of this procedure? Photolithography is the process of transferrin
The amount of iron and manganese in an alloy can be determined by precipitating the metals with 8-hydroxyquinoline, C9H7NO. After weighing the mixed precipitate, the precipitate is
Explain the different types of polarization mechanisms in dielectrics. There are essentially four basic kinds of polarization mechanisms: Interface polarization: Electron
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