Consider a 7.6-cm-long and 3-cm-diameter cylindrical Iamb meat chunk (p = 1030 Kg/m 3 , c p = 3 .49 kJ/kg .K), k = 0 .456 W/m .K, α = 1 .3 × 10 -7 m 2 /s) . Fifteen such meat chunks initially at 2°C are dropped into boiling waler at 95°C with a heat transfer coefficient of 1200 W/m 2 K. The amount of heat transfer during the first 8 min of cooking is (a) 71 kJ (b) 227kJ (c) 238 kJ (d) 269k) (e) 307 kJ
Consider a 7.6-cm-long and 3-cm-diameter cylindrical Iamb meat chunk (p = 1030 Kg/m 3 , c p = 3 .49 kJ/kg .K), k = 0 .456 W/m .K, α = 1 .3 × 10 -7 m 2 /s) . Fifteen such meat chunks initially at 2°C are dropped into boiling waler at 95°C with a heat transfer coefficient of 1200 W/m 2 K. The amount of heat transfer during the first 8 min of cooking is (a) 71 kJ (b) 227kJ (c) 238 kJ (d) 269k) (e) 307 kJ
Solution Summary: The author calculates the characteristic length of lamb meat chunk by approximating it as a long cylinder.
Consider a 7.6-cm-long and 3-cm-diameter cylindrical Iamb meat chunk
(p = 1030 Kg/m
3
,
c
p
= 3
.49 kJ/kg
.K), k = 0
.456 W/m
.K,
α
= 1
.3
×
10
-7
m
2
/s)
. Fifteen such meat chunks initially at 2°C are dropped into boiling waler at 95°C with a heat transfer coefficient of 1200 W/m2 K. The amount of heat transfer during the first 8 min of cooking is
A 2-kW resistance heater wire with thermal conductivity of k=20 W/mK, a diameter of D=4mm, and a length of L=0.9m is used to boil water. If the outer surface temp of the resistance wire is Ts=110 degrees C, determine the temp at the center of the wire.
A flat-plate solar collector is used to heat water by having water flow through tubes attached at the back of the thin solar absorber plate. The absorber plate has emmisssivity and an absorptivity of 0.9. The top surface where x=0 temp of the absorber is T0=35 degrees C, and solar radiation is incident on the basorber at 500 W/m^2 with a surrounding temp of 0 degrees C. The convection heat transfer coefficient at the absorber surface is 5 W/m^2 K, while the ambient temp is 25 degrees C. Show that the variation of the temp in the basorber plate can be expressed as T(x)=-(q0/k)x+T0, and determine net heat flux, q, absorbed by solar collector.
Using properties of a saturated water, explain how you would determine the mole fraction of water vapor at the surface of a lake when the temp of the lake surface and the atmospheric pressure are specified.
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