A brass weight is to be attached to the bottom of the cylinder described in Problems 5.22 and 5.23 so that the cylinder will be completely submerged and neutrally buoyant in water at 958 C . The brass is to be a cylinder with the same diameter as the original cylinder shown in Fig. 5.24. What is the required thickness of the brass?
A brass weight is to be attached to the bottom of the cylinder described in Problems 5.22 and 5.23 so that the cylinder will be completely submerged and neutrally buoyant in water at 958 C . The brass is to be a cylinder with the same diameter as the original cylinder shown in Fig. 5.24. What is the required thickness of the brass?
A brass weight is to be attached to the bottom of the cylinder described in Problems 5.22 and 5.23 so that the cylinder will be completely submerged and neutrally buoyant in water at
958
C
. The brass is to be a cylinder with the same diameter as the original cylinder shown in Fig. 5.24. What is the required thickness of the brass?
1.1 Consider the fireclay brick wall of Example 1.1 that is
operating under different thermal conditions. The tem-
perature distribution, at an instant in time, is T(x) = a+
bx where a 1400 K and b = -1000 K/m. Determine
the heat fluxes, q", and heat rates, q, at x = 0 and x = L.
Do steady-state conditions exist?
2.4 To determine the effect of the temperature dependence
of the thermal conductivity on the temperature dis-
tribution in a solid, consider a material for which this
dependence may be represented as
k = k₁ + aT
where k, is a positive constant and a is a coefficient that
may be positive or negative. Sketch the steady-state
temperature distribution associated with heat transfer
in a plane wall for three cases corresponding to a > 0,
a = 0, and a < 0.
1.21 A one-dimensional plane wall is exposed to convective
and radiative conditions at x = 0. The ambient and sur-
rounding temperatures are T = 20°C and Tur = 40°C,
respectively. The convection heat transfer coefficient is
h=20 W/m² K, and the absorptivity of the exposed sur-
face is α=0.78. Determine the convective and radiative
heat fluxes to the wall at x = 0 if the wall surface tem-
perature is T, = 24°C. Assume the exposed wall surface
is gray, and the surroundings are large.
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