Question
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Air at 25°C is flowing over 400°C hot iron ball with a velocity of 10 m/s....
Air at 25°C is flowing over 400°C hot iron ball with a velocity of 10 m/s. The diameter of the iron ball is 10 cm diameter and (p =7874 kg/m3 and cP = 450 J/kg.K). After a while the surface temperature of the ball drops to 300°C.
- Determine the average rate of heat transfer from the ball.
- How long will it take to drop from 400°C to 300°C.
- Calculate the drag force. (The surface of the ball is smooth.)
Solutions
Amanda K answered 4 months agoRelated Solutions
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 20 m/s, while the...
Air at 25°C flows over a 10-mm-diameter sphere with a velocity
of 20 m/s, while the surface of the sphere is maintained at 75°C.
What is the rate of heat transfer from the sphere? q = ___ W ?
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Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere with a velocity of...
Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere with
a velocity of 3.5 m/s. If the surface temperature of the sphere is
constant at 80°C, determine the Reynolds number corresponding to
the sphere, its average drag co-efficient, and the heat transfer
rate from the sphere. The properties of air (1 atm) at the free
stream temperature T∞ = 20°C, ρ = 1.204
kg/m3, k = 0.02514
W/m∙K, μ = 1.825 × 10−5 kg/m∙s,
and Pr = 0.7309. At the surface
temperature Ts=
80°C: μs =...
Air at 20°C and a velocity of 8 m/s flows over the 4-m length of a...
Air at 20°C and a velocity of 8 m/s flows over the 4-m length of
a 4-m wide single surface of a square plate whose temperature is
80°C. (For properties of air, use k = 0.02735 W/m·K, Pr = 0.7228, ν
= 1.798 x 10-5 m2 /s ) Given the above information, do the
calculations to answer the two MC questions below. Please clearly
show/discuss your solution method and calculations. A.
__________The rate of heat transfer, Q̇ , from this...
Cold air at a temperature of 10 C and a velocity of 3 m/s is moving...
Cold air at a temperature of 10 C and a velocity of 3 m/s is
moving parallel to a flat plate with a length of 6 m and a surface
temperature of 75 C.
A) Find the transition location on the plate and the heat loss
from the plate.
B) Repeat part (A) for water at the same velocity and
temperature. The flat plate is made from copper.
A ball of mass 500g is shot with an initial velocity of 10 m/s. the ball...
A ball of mass 500g is shot with an initial velocity of 10 m/s.
the ball hits a pendulum bob (initially at rest) of mass of 2kg and
the collision is perfectly elastic. a) find the velocity of the
pendulum bob immediately after the collision. b) find the length of
the pendulum if it comes to rest after turning by an angle of 30
degrees.
- Part b is the one I am stuck on!!!
Water at a temperature of 80 °C and velocity of 1.2 m/s is flowing parallel to...
Water at a temperature of 80 °C and velocity of 1.2 m/s is
flowing parallel to one side of a smooth flat plate. The plate is
maintained at a constant temperature of 24 °C and is 0.8 m long and
0.5 m wide. Determine the following:
The heat flux at a distance x = 0.6m from the front edge of the
plate, q” = ____________
The location of the maximum heat flux on the plate, x =
_________
The total...
Cold air at temperature of 10 C and velocity of 3 m/s is moving parallel to...
Cold air at temperature of 10 C and velocity of 3 m/s is moving
parallel to a flat plate with the length of 6 m and surface
temperature of 75 C. A) Find the transition location on the plate
and the heat loss from the plate. B) Repeat part (A) for water at
the same velocity and temperature. The flat plate is made from
copper.
Cold air at temperature of 10 C and velocity of 3 m/s is moving parallel to...
Cold air at temperature of 10 C and velocity of 3 m/s is moving
parallel to a flat plate with the length of 6 m and surface
temperature of 75 C. A) Find the transition location on the plate
and the heat loss from the plate. B) Repeat part (A) for water at
the same velocity and temperature. The flat plate is made from
copper.
Air at 40 degrees C is humidified by flowing over a 1-m-long container filled with water....
Air at 40 degrees C is humidified by flowing over a 1-m-long
container filled with water. The surface area of container is
0.5m^2.The interfacial temperature is 20 degrees C. If the initial
humidity of the air is 0% and its velocity is 0.5 m/s, calculate
the mass flow rate of vapor evaporated.
Air flows over a 4 meter long flat plate at a velocity of 8 m/s. Using...
Air flows over a 4 meter long flat plate at a velocity of 8 m/s.
Using a spreadsheet, calculate the boundary layer thickness and
wall shear stress at 0.1 meter intervals along the plate. Do not
plot the wall shear stress at x=0. Use a transition Reynolds number
of 5 x 10^5 . (You will need to calculate Rex at each location to
determine if the laminar or turbulent correlations should be used.)
Generate a spreadsheet table that includes columns...
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