A large number of long tubes, each of diameter D,are placed parallel to each other and at a center-to-center distanceof s. Since all of the tubes are geometrically similarand at the same temperature, these could be treated collectivelyas one surface (Aj) for radiation heat transfer calculations., the tube-bank (Aj) is placedopposite a large flat wall (Ai) such that the tube-bank is parallelto the wall.(a) Calculate the view factors Fij and Fji for s = 3.0 cmand D = 1.5 cm.(b) Calculate the net rate of radiation heat transferbetween the wall and the tube-bank per unit area ofthe wall when Ti = 900°C, Tj = 60°C, «i = 0.8, and«j = 0.9.(c) A fluid flows through the tubes at an average temperatureof 40°C, resulting in a heat transfer coefficientof 2.0 kW/m2·K. Assuming Ti = 900°C, «i = 0.8,and «j = 0.9 (as above) and neglecting the tube wallthickness and convection from the outer surface,calculate the temperature of the tube surface in steadyoperation.
A large number of long tubes, each of diameter D,
are placed parallel to each other and at a center-to-center distance
of s. Since all of the tubes are geometrically similar
and at the same temperature, these could be treated collectively
as one surface (Aj) for radiation heat transfer calculations.
, the tube-bank (Aj) is placed
opposite a large flat wall (Ai) such that the tube-bank is parallel
to the wall.
(a) Calculate the view factors Fij and Fji for s = 3.0 cm
and D = 1.5 cm.
(b) Calculate the net rate of radiation heat transfer
between the wall and the tube-bank per unit area of
the wall when Ti = 900°C, Tj = 60°C, «i = 0.8, and
«j = 0.9.
(c) A fluid flows through the tubes at an average temperature
of 40°C, resulting in a heat transfer coefficient
of 2.0 kW/m2·K. Assuming Ti = 900°C, «i = 0.8,
and «j = 0.9 (as above) and neglecting the tube wall
thickness and convection from the outer surface,
calculate the temperature of the tube surface in steady
operation.
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