Oranges of 2.5-in-diameter (k = 0 .26 Btu/h .ft . o F and α = 1 .4 × 10 -6 ft 2 /s) and initially at a uniform temperature of 78°F are to be cooled by refrigerated air at 25°F flowing at a velocity of 1 ft/s. The average heat transfer coefficient between the oranges and the air is experimentally determined to be 4.6 Btu/h.ft 2 °F. Determine how long it will take for the center temperature of the oranges to drop to 40°F. Also, determine if any part of the oranges will freeze during this process. Solve this problem using the analytical one-term approximation method.
Oranges of 2.5-in-diameter (k = 0 .26 Btu/h .ft . o F and α = 1 .4 × 10 -6 ft 2 /s) and initially at a uniform temperature of 78°F are to be cooled by refrigerated air at 25°F flowing at a velocity of 1 ft/s. The average heat transfer coefficient between the oranges and the air is experimentally determined to be 4.6 Btu/h.ft 2 °F. Determine how long it will take for the center temperature of the oranges to drop to 40°F. Also, determine if any part of the oranges will freeze during this process. Solve this problem using the analytical one-term approximation method.
Oranges of 2.5-in-diameter
(k = 0
.26 Btu/h
.ft
.
o
F and
α
= 1
.4
×
10
-6
ft
2
/s)
and initially at a uniform temperature of 78°F are to be cooled by refrigerated air at 25°F flowing at a velocity of 1 ft/s. The average heat transfer coefficient between the oranges and the air is experimentally determined to be 4.6 Btu/h.ft2 °F. Determine how long it will take for the center temperature of the oranges to drop to 40°F. Also, determine if any part of the oranges will freeze during this process. Solve this problem using the analytical one-term approximation method.
3.) 15.40 – Collar B moves up at constant velocity vB = 1.5 m/s. Rod AB has length = 1.2 m. The incline is
at angle = 25°. Compute an expression for the angular velocity of rod AB, ė and the velocity of end A of the
rod (✓✓) as a function of v₂,1,0,0. Then compute numerical answers for ȧ & y_ with 0 = 50°.
2.) 15.12 The assembly shown consists of the straight rod ABC which passes through and is welded to the
grectangular plate DEFH. The assembly rotates about the axis AC with a constant angular velocity of 9 rad/s.
Knowing that the motion when viewed from C is counterclockwise, determine the velocity and acceleration of
corner F.
500
Q3: The attachment shown in Fig.3 is made of
1040 HR. The static force is 30 kN. Specify the
weldment (give the pattern, electrode
number, type of weld, length of weld, and leg
size).
Fig. 3
All dimension
in mm
30 kN
100
(10 Marks)
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