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When using the apparatus from this experiment, the average heat flux at the heater surface is...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 2...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of 2 cm and a length of 20 m. The outer surface temperature of the cylinder is 100 °C. The average Nusselt number is 38. The speed of the air before it reaches the cylinder is 10 m/s. Moreover, the freestream temperature of the air before it gets dose to the cylinder are 20 oc. If needed. You may consider the following thermohysical properties of...
2. To measure the speed of an airplane, a narrow strip heater is attached to the...
2. To measure the speed of an airplane, a narrow strip heater is attached to the wing of an airplane 0.01 m from the leading edge. A heat flux of 300 W/m²is electrically dissipated and the temperature difference between the heater and the surrounding air is measured to be 1 °C. Assume that the temperature of the wing is uniform. What is the speed of the aircraft? (Hint: Nux = 0.332Rex?Pr1/3) 1q" - 300 W/m² 0.01m Heater Properties of air...
Problem 1 (25 points) In an experiment to measure heat transfer coefficients, a very thin foil...
Problem 1 (25 points) In an experiment to measure heat transfer coefficients, a very thin foil of low emissivi attached to a slab of material with low thermal conductivity. The other surface of the metal foil is exposed to convection heat transfer by fluid flowing over the foil surface. The slab on which the metal foil is attached has a thickness of 30 mm and a thermal conductivity of 0.023 W/m K in a condition where the surrounding room temperature...
A 50 mm thick steel plate (AISI347) has a uniform heat flux applied to its bottom...
A 50 mm thick steel plate (AISI347) has a uniform heat flux
applied to its bottom surface by a heater. The heater is in contact
with the steel plate, and the interface between the heater and
steel has a contact resistance of 2.0 x 10-4
m2*K/W. The top surface of the plate is exposed to
surrounding air (T = 20oC, h = 10 W/m2*K) and
exchanges radiation with surroundings at Tsur =
10oC. The emissivity of the plate is 0.85....
1. In the experiment of thermal conductivity measurements of unit 1, a group measured the heater...
1. In the experiment of thermal conductivity measurements of unit 1, a group measured the heater power to be 272.37 W. At steady state, the temperatures along the metal bars were also measured. At the stainless-steel bar portion, temperatures at two points were Tsi = 553 K and Ts2 = 466 K at a distance of 0.0349 m. The cross-sectional area of the bar equals 0.0052 m . (10 points) Determine: A) Heat flux. B) Heat conductivity of stainless steel....
Use the integral method for boundary layer flow and convective heat transfer over a flat plate he...
Use the integral method for boundary layer flow and convective heat transfer over a flat plate heated by maintaining a constant heat flux q"w, for the case of very low Prandtl number, Pr0. Assume that the free stream velocity of the fluid, U, and free stream temperature, T-do not vary with x. Using the integral form of energy equation, show that under these conditions: (a) the temperature profile, (T- T) is given by, 41 2 CT-T oa (b) the wall...
Problem : A cryogenic flui d is flowing in a 304 SS pipe. The pipe is...
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of 32°C during operation. The temperature of ambient air is 22°C. Assuming the door has an emissivity of 0.8 and the surroundings are also at 22°C, determine the heat transfer by free convection and the heat transfer by radiation. 1) What is the volumetric thermal expansion coefficient of air at the film temperature outside the oven door, in 1/K? 2) What is the Rayleigh number...
2. (10 points) A pharmaceutical fluid is sterilized by heating it from 25 to 75 °C...
2. (10 points) A pharmaceutical fluid is sterilized by heating it from 25 to 75 °C as it moves at 0.2 m/s through a straight thin-walled stainless steel tube of 12.7-mm diameter that is 10 m long. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the straight tube. The pharmaceutical fluid properties may be approximated as: p = 1000 kg/mº, cp = 4 kJ/kg-K, u = 2.102 kg/s-m, k = 1...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of 2 cm and a length of 20 m. The outer surface temperature of the cylinder is 100 °C. The average Nusselt number is 38. The speed of the air before it reaches the cylinder is 10 m/s. Moreover, the freestream temperature of the air before it gets dose to the cylinder are 20 oc. If needed. You may consider the following thermohysical properties of...
2. To measure the speed of an airplane, a narrow strip heater is attached to the wing of an airplane 0.01 m from the leading edge. A heat flux of 300 W/m²is electrically dissipated and the temperature difference between the heater and the surrounding air is measured to be 1 °C. Assume that the temperature of the wing is uniform. What is the speed of the aircraft? (Hint: Nux = 0.332Rex?Pr1/3) 1q" - 300 W/m² 0.01m Heater Properties of air...
Problem 1 (25 points) In an experiment to measure heat transfer coefficients, a very thin foil of low emissivi attached to a slab of material with low thermal conductivity. The other surface of the metal foil is exposed to convection heat transfer by fluid flowing over the foil surface. The slab on which the metal foil is attached has a thickness of 30 mm and a thermal conductivity of 0.023 W/m K in a condition where the surrounding room temperature...
A 50 mm thick steel plate (AISI347) has a uniform heat flux
applied to its bottom surface by a heater. The heater is in contact
with the steel plate, and the interface between the heater and
steel has a contact resistance of 2.0 x 10-4
m2*K/W. The top surface of the plate is exposed to
surrounding air (T = 20oC, h = 10 W/m2*K) and
exchanges radiation with surroundings at Tsur =
10oC. The emissivity of the plate is 0.85....
1. In the experiment of thermal conductivity measurements of unit 1, a group measured the heater power to be 272.37 W. At steady state, the temperatures along the metal bars were also measured. At the stainless-steel bar portion, temperatures at two points were Tsi = 553 K and Ts2 = 466 K at a distance of 0.0349 m. The cross-sectional area of the bar equals 0.0052 m . (10 points) Determine: A) Heat flux. B) Heat conductivity of stainless steel....
Use the integral method for boundary layer flow and convective heat transfer over a flat plate heated by maintaining a constant heat flux q"w, for the case of very low Prandtl number, Pr0. Assume that the free stream velocity of the fluid, U, and free stream temperature, T-do not vary with x. Using the integral form of energy equation, show that under these conditions: (a) the temperature profile, (T- T) is given by, 41 2 CT-T oa (b) the wall...
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
2. (10 points) A pharmaceutical fluid is sterilized by heating it from 25 to 75 °C as it moves at 0.2 m/s through a straight thin-walled stainless steel tube of 12.7-mm diameter that is 10 m long. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the straight tube. The pharmaceutical fluid properties may be approximated as: p = 1000 kg/mº, cp = 4 kJ/kg-K, u = 2.102 kg/s-m, k = 1...
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