Match the types of heat transfer to the example.
Natural Convection
Forced Convection
Conduction
Radiation
A.
You burn your hand touching a hot pot in the kitchen.
B.
Frost forming during a cold clear night, with an outdoor
temperature of 2 degrees Celsius.
C.
Cold wind blowing on your face.
D.
Water heating up in a pot on a stove top.
Consider the following schematic for an experiemental
methodology to measure the convection heat transfer coefficient
distrubution on an airfoil. The metal sheathing is supplied with a
heat generation rate of 20 * 106 W/m3. The
thickness of the metal sheathing is t = 30 um, and the sheathing's
thermal conductivity is k=25 W/mK. The 30 surface locations where
the temperatures are measured are spaced evenly at 2mm apart. The
measured temperatures are listed in the table below.
Location
Temperature (degrees...
Convection Heat transfer internal flow
Consider water flowing in a heated tube. The tube is 14 m long
with an inner diameter of 1 cm. The heat
is added at 1500 W/m2 uniformly along the tube. Water flows at 0.3
m/s. Use the following water property
? = 1000 kg/m3, ? = 1.4 × 10?3 kg/m·s, cp =
4.2 kJ/kg·K, k = 0.58 W/m·K, and determine
1. Heat transfer coefficient at the tube exit.
2. Tube surface temperature at the...
The existence of convection heat transfer has been long used by traditional fishermen for fishing purposes. For example, by utilizing land breeze, the fishermen will go to the sea at night, and conversely, by utilizing sea breeze they will come back during the day. How this natural heat transfer can be used by the fishermen? Next, explain the mechanism of the occurrence of the land breeze and the sea breeze and their relation to the convection heat transfer events in...
A reaction takes place in a balloon such that 425 J of heat are
taken in from the surroundings and 193 J of work are done by the
surroundings.
What is ΔE for the system? in J
What is ΔH for
the surroundings? in J
What is ΔE for
the universe? in J
Sunland Company manufactures and sells high-priced motorcycles.
The Engine Division produces and sells engines to other motorcycle
companies and internally to the Production Division. It has been
decided that the Engine Division will sell 12000 units to the
Production Division at 1050 a unit. The Engine Division, currently
operating at capacity, has a unit sales price of $1750 and unit
variable costs and fixed costs of $1050 and $700, respectively. The
Production Division is currently paying $1600 per unit to...
Photosynthesis is a process that takes place within the
chloroplast of the A. titanium plant and this process
requires a lot of proteins and various enzymes that are produced by
cytosolic ribosomes. Explain, briefly, the process and specialized
features that these proteins must have/undergo to make their way to
the chloroplast. (2-3 sentences).
A steel pipe (k = 43 W/m K) carries a heat‐transfer fluid and is
covered with a 2‐cm layer of calcium silicate insulation (k = 0.029
W/m K) to reduce the heat loss. The inside and outside pipe
diameters are 5.25 cm and 6.03cm, respectively. If the inner pipe
surface is at 150°C and the exterior surface of the insulation is
at 25°C, calculate: (a) The rate of heat loss per unit length of
pipe (b) The temperature of the...