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A simple procedure for measuring surface convection heat transfer coefficients involves coating the surface with a thin layer of material having a precise melting point temperature. The surface is then heated and, by determining the time required for melting to occur.
The convection coefficient is determined. The following experimental arrangement uses the procedure to determine the convection coefficient for gas flow normal to a surface. Specifically, a long copper rod is encased in a super insulator of very low thermal conductivity, and a very thin coating is applied to its exposed surface. If the rod is initially at 25°C and gas flow for which h = 200 W/m2 · K and T8 = 300°C is initiated, what is the melting point temperature of the coating if melting is observed to occur at t = 400 s?
If there are two forces acting perpendicular to each other at the same pin, do they resolve together to determine bearing stress?
Twenty pounds of a gas mixture is contained in a tank with volume 30 cubic feet at 30 psia and 70 F. The gas mixture has volumetric analysis of twenty percent carbon dioxide, thirty percent oxygen, and fifty percent nitrogen.
a rigid tank contains 20 lbm of air at 50 psia and 80o f. the air is now heated until its pressure doubles. determine
multi-stage flash distillation is used to desalinate seawater so it is fit for human consumption. a flash distillation
The entrance is inward projecting. What flow will be expected if the gate valve is one-half open?
consider the following finite difference approximation for the base point xi in a one-dimensional finite difference
liquid water at 0degc weighs 9810 nm3 and ice at the same temperature weighs 8992 nm3. consider a system which is
the resistance to motion of a good bicycle on smooth pavement is nearly all due to aerodynamic drag. assume that the
the water in a 25 m deep reservoir is kept inside by a 150 m wide wall whose cross section is an equilateral triangle.
Describe the main kinds of social mechanisms that are used by people to communicate and collaborate.
h2o at 1000of 140 psi enters a turbine and expands to 5 psi. the mass flow rate is 4 lbms and the power developed is
determine the terminal velocity of a 75-mm diameter sphere made of solid aluminum specific weight 26.6knm3 in free fall
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