Question
In: Mechanical Engineering
2. Initially, the steel sphere with a diameter of 15 cm with a temperature of 200°C...
2. Initially, the steel sphere with a diameter of 15 cm with a temperature of 200°C was left to cool in the airflow at a temperature of 6 m/s. By making the necessary acceptances, calculate the amount of time the aluminum sphere will fall to a temperature of 50°C.
The relevant correlation for forced transport on the sphere;
NuD = 2 + (0.4 ReD 0.5+ 0.06 ReD 2/3) Pr 0.6 (μo/μy)1/4
Solutions
samet mamat answered 1 year agoRelated Solutions
A 1.5 kg solid brass sphere is initially at a temperature of 15.0°C, the diameter of...
A 1.5 kg solid brass sphere is initially at a temperature of
15.0°C, the diameter of the brass sphere at this initial
temperature is 6.50 cm.
(a) If the volume of the sphere is to increase by 2.50%, what is
the final temperature of the brass sphere?
(b) If the sphere is heated to 225°C. What is the change in the
radius of the sphere?
A sphere with a diameter of 70 cm is held at a temperature of 290
A sphere with a diameter of 70 cm is held at a temperature of
290
. A 20 mm diameter sphere made of aluminum alloy 2024 initially at a uniform temperature...
. A 20 mm diameter sphere made of aluminum alloy 2024 initially
at a uniform temperature of 500 ºC is suddenly immersed in a
saturated water bath maintained at atmospheric pressure. The
surface of the sphere has an emissivity or 0.25. Determine.
a.) the total heat transfer coefficient for this initial
condition, and
b.) what fraction of the total coefficient is contributed by
radiation. (~180 W/m2 -K, ~ 7%)
Drag measurements were taken for a 5 cm diameter sphere in water at 20 °C to...
Drag measurements were taken for a 5 cm diameter sphere in water
at 20 °C to predict the drag force of a 1 m diameter balloon rising
in air with standard temperature and pressure. Given kinematic
viscosity of water (v) = 1.0 X 10-6
m2/s and kinematic viscosity of air (v) = 1.46
X 10-5 m2/s.
Perform the Buckingham Pi theorem to generate a relationship
for FD as a function of the independent variables.
Assume the drag FD is a...
Drag measurements were taken for a 5 cm diameter sphere in water at 20 °C to...
Drag measurements were taken for a 5 cm diameter sphere in water
at 20 °C to predict the drag force of a 1 m diameter balloon rising
in air with standard temperature and pressure. Given kinematic
viscosity of water (v) = 1.0 X 10-6
m2/s and kinematic viscosity of air (v) = 1.46
X 10-5 m2/s.
Perform the Buckingham Pi theorem to generate a relationship
for FD as a function of the independent variables.
Assume the drag FD is a...
A thin plate is initially at a uniform temperature of 200°C. At a certain timet =...
A thin plate is initially at a uniform temperature of 200°C. At
a certain timet = 0 the temperature of the east side of
the plate is suddenly reduced to 0°C. The other surface is
insulated. Use the explicit finite volume method in con- junction
with a suitable time step size to calculate the transient
temperature distribution of the slab and compare it with the
analytical solution at time (i) t = 40 s, (ii) t
= 80 s and...
Water at 15°C enters a tube of 2 cm of diameter with flow rate 3953 kg/h....
Water at 15°C enters a tube of 2 cm of diameter with flow rate
3953 kg/h. Assume the ratio L/D >10, and the wall temperature is
constant at 80◦C. The outlet temperature is 50°C The properties of
water at the film temperature are density rho = ? = 985 ?/?3,
specific heat ?p = 4180 ?/?, conductivity ? = 0.651 ?/?, dynamic
viscosity mu= ?? = 4.71 × 10−4 ?/?, At the wall temperature of 80°C
we have dynamic viscosity...
100 people enter a room that is initially at a temperature of 15 C and pressure...
100 people enter a room that is initially at a temperature of 15
C and pressure of 1bar. Each person losses heat to the air in the
room at a constant rate of 300 W at a constant temperature of 37 C.
The air mass in the room is 750 Kg, remains constant and its cv =
0.79 kJ/(Kg K), cp = 1.08 kJ/(Kg K) and the gas constant is 0.287
kJ/(Kg K). Air enters the room at a temperature...
100. mL of H2O is initially at room temperature (22.0∘C). A chilled steel rod at 2.0∘C...
100. mL of H2O is initially at room temperature (22.0∘C). A
chilled steel rod at 2.0∘C is placed in the water. If the final
temperature of the system is 21.1 ∘C, what is the mass of the steel
bar? Specific heat of water = 4.18 J/g⋅∘C Specific heat of steel =
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significant figure.
1. A 0.750 kg hollow sphere with a diameter of 25 cm diameter starts from rest...
1. A 0.750 kg hollow sphere with a diameter of 25 cm diameter
starts from rest at the top of a 65 cm tall incline. There is just
enough friction on the incline to make the sphere roll instead of
slide.
(a) What types of energy does the sphere have at the top? at the
bottom?
(b) What is the moment of inertia of the sphere?
(c) What is the velocity of the sphere when it reaches the
bottom of...
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