If the plate temperature is 170°C and the gas temperature is 30°C, calculate (a) the average heat transfer coefficient, (b) the rate of heat transfer between the plate and the gas and (c) the local heat flux 2 m from the leading edge.
The heat transfer coefficient for a gas flowing over a thin flat plate 3-m-long and
0.3-m-wide varies with distance from the leading edge according to
GIVEN
• Gas flowing over a 3-m-long by 0.3-m-wide flat plate
• Heat transfer coefficient (hc) is given by the equation above
• The plate temperature (TP) = 170°C
• The gas temperature (TG) = 30°C
FIND
(a) The average heat transfer coefficient ( h c) (b) The rate of heat transfer (qc) (c) The local heat flux at x = 2 m (qc (2)/A)
ASSUMPTIONS
• Steady state prevails
SKETCH
(a) The average heat transfer coefficient can be calculated by
(b) The total convective heat transfer is given by
(c) The heat flux at x = 2 m is
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