FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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5. (计算题)
Calculate the DOF of following mechanisms. If there are compound hinge, passive DOF or Redundant Constraint, please point
them out.
品
⑤A
(a) 凸轮拨杆机构
6.(计算题)
Calculate the DOF of following mechanisms. If there are compound hinge, passive DOF or Redundant Constraint, please point
them out.
E
D
A
B
C
F
A hot surface at 150°C is to be cooled by attaching 3-cm-long, 0.25-cm-diameter aluminum pin fins (k = 237 W/m-K) to it, with a center-
to-center distance of 0.6 cm. The temperature of the surrounding medium is 30°C, and the heat transfer coefficient on the surfaces is
35 W/m²K. Determine the rate of heat transfer from the surface for a 1-m × 1-m section of the plate. Also determine the overall
effectiveness of the fins.
0.6 cm
0.25 cm
The total rate of heat transfer is
kW.
The fin effectiveness is
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