A) A stainless steel bar 11.8 cm long is welded end to end to a copper...
A) A stainless steel bar 11.8 cm long is welded end to end to a copper bar 22.6 cm long. Each bar has a square cross section, 2.0 cm on a side. The free end of the stainless steel bar is kept at 100∘C by placing it in contact with steam, and the free end of the copper bar is kept at with 0∘C by placing it in contact with ice. Both bars are perfectly insulated on their sides. What is the total rate of heat flow through the bars?
Thermal conductivity of steel and copper are respectively 14W/mK and 390W/mK.
B) Suppose the bars of part A) are separated. One end of each bar is kept at 100∘C and the other end of each bar is kept a 0∘C. What is the total rate of heat flow in the two bars now?
Homework Answers
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A) A stainless steel bar 11.8 cm long is welded end to end to a
copper...
2. A steel bar 20.00 cm long is welded end to end with a brass bar...
2. A steel bar 20.00 cm long is welded end to end with a brass bar 15.00 cm long. Both bars are insulated perfectly on their sides and each has a cross section area of 5.0o cm2. The free end of the steel bar is kept at 100°C and the free end of the brass bar is kept at 0°C. Consider Ksteel 50.2 w/m-Co, kbrass 0.800 w/m-Co. Find: A. the temperature at the junction of the bars B. the rate...
A 22.0-m-long bar of steel expands due to a temperature increase. A 11.0-m-long bar of copper...
A 22.0-m-long bar of steel expands due to a temperature
increase. A 11.0-m-long bar of copper also gets longer due to the
same temperature rise. The two bars were originally separated by a
gap of 1.6 cm. Assume the steel and copper bars are fixed on the
ends, as shown in the following figure.
1)
Calculate the change in temperature if the gap is exactly
"closed" by the expanding bars. (Express your answer to two
significant figures.)
Answer in K...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the oute...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw-0.58 kg/s. At the given position along the pipe the bulk temperature of the air, Ta-100°C, and the bulk temperature of the water, Tw- s 10°C. The thermal conductivity of stainless steel, kss 15 W/mK....
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During a cooling process of a stainless steel plate, water at 30°C flows over this plate at a velocity of 0.02 m/s. The stainless steel plate (k=19 W/mK) has 1.15 meter long in the flow direction) and the plate width is 0.7 meter. The plate has a uniform surface temperature of 70°C. Determine, 1. The average friction coefficient 2. The total drag force due to friction (N) 3. The average convection heat transfer 2. coefficient (W/m K) 4. The steady...
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One end of a long rod 3 cm in diameter is inserted into a furnace with the (3 outer end projecting into the outside air. Once the steady state is reached the temperature of the rod is measured at two points, 15 cm apart and found to be 140°C and 100°C, when the atmospheric air is at 30°C with convection coefficient of 20 W/m2.K. Calculate the thermal conductivity of *.the rod material Consider a stainless steel spoon(k = 15.1 W/m.K), partially...
Two plates are held together by square stainless steel (ASTM A479 904L) bars with thickness of...
Two plates are held together by square stainless steel (ASTM A479 904L) bars with thickness of 12 mm. Each bar has a thermal conductivity of 12 W/m-K, a specific heat of 500 J/kg-K, and a density of 79 g/cm3. The bars are situated in between the two plates, and they are occasionally submerged in hot liquid at 300°C with a convection heat transfer coefficient of 96 W/m2.K. The length of each bar that is exposed to the hot liquid is...
One end of a 58-cm-long copper rod with a diameter of 2.4 cm is kept at...
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A long, hot AISI 304 stainless steel bar of rectangular cross section has dimensions w =...
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One end of a 56-cm-long copper rod with a diameter of 3.0 cm is kept at...
One end of a 56-cm-long copper rod with a diameter of 3.0 cm is kept at 430 ∘C∘, and the other is immersed in water at 24 ∘C∘. Calculate the heat conduction rate along the rod. Express your answer to two significant figures and include the appropriate units.
2. A steel bar 20.00 cm long is welded end to end with a brass bar 15.00 cm long. Both bars are insulated perfectly on their sides and each has a cross section area of 5.0o cm2. The free end of the steel bar is kept at 100°C and the free end of the brass bar is kept at 0°C. Consider Ksteel 50.2 w/m-Co, kbrass 0.800 w/m-Co. Find: A. the temperature at the junction of the bars B. the rate...
A 22.0-m-long bar of steel expands due to a temperature
increase. A 11.0-m-long bar of copper also gets longer due to the
same temperature rise. The two bars were originally separated by a
gap of 1.6 cm. Assume the steel and copper bars are fixed on the
ends, as shown in the following figure.
1)
Calculate the change in temperature if the gap is exactly
"closed" by the expanding bars. (Express your answer to two
significant figures.)
Answer in K...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw-0.58 kg/s. At the given position along the pipe the bulk temperature of the air, Ta-100°C, and the bulk temperature of the water, Tw- s 10°C. The thermal conductivity of stainless steel, kss 15 W/mK....
During a cooling process of a stainless steel plate, water at 30°C flows over this plate at a velocity of 0.02 m/s. The stainless steel plate (k=19 W/mK) has 1.15 meter long in the flow direction) and the plate width is 0.7 meter. The plate has a uniform surface temperature of 70°C. Determine, 1. The average friction coefficient 2. The total drag force due to friction (N) 3. The average convection heat transfer 2. coefficient (W/m K) 4. The steady...
Two plates are held together by square stainless steel (ASTM A479 904L) bars with thickness of 12 mm. Each bar has a thermal conductivity of 12 W/m-K, a specific heat of 500 J/kg-K, and a density of 79 g/cm3. The bars are situated in between the two plates, and they are occasionally submerged in hot liquid at 300°C with a convection heat transfer coefficient of 96 W/m2.K. The length of each bar that is exposed to the hot liquid is...
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