Select the quantities upon which the rate of heat flow depends. Contact area Volume Pressure Time...
Select the quantities upon which the rate of heat flow depends.
Contact area
Volume Pressure
Time
Temperature gradient
Thermal conductivity
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Select the quantities upon which the rate of heat flow depends. Contact area Volume Pressure Time...
Problem 2 temperature field. Problem 3 (Fourier's Law of Heat Flow) From a temperature field, w...
This equation from problem 2 is needed to solve problem 3.
please skip C
problem 2 temperature field. Problem 3 (Fourier's Law of Heat Flow) From a temperature field, we can use Fourier's Law to compute the heat transfer rate (which is a vector field): Where k is a constant known as the thermal conductivity. For the purposes of this exercise, we can assume that k is 1. We wish to apply Fourier's Law to the temperature field given in...
A uniform steel plate has an area of 0.819 m2 When subjected to a temperature difference...
A uniform steel plate has an area of 0.819 m2 When subjected to a temperature difference between its sides, a heat current of 25.7 kW is found to flow temperature difference when the plate is 5.73 cm thick? The thermal conductivity of steel is 50.2 WI(m K). it. What is the temperature gradient? What is the Temperature gradient: Number K/ m Temperature difference: Number (") The heat current is the amount of heat that flows per unit time
Problem Two slabs are in perfect contact. In slab 1 (thickness Li, thermal conductivity ki) heat...
Problem Two slabs are in perfect contact. In slab 1 (thickness Li, thermal conductivity ki) heat is generating at a constant rate of S per uni volume. There is no heat generation inside slab 2 (thickness L2, thermal conductivity k2). The temperature at the left face of slab 1 (x-0) is maintained at To and the temperature at the interface between slab 1 and slab 2 (at x L) is found to be T. The right face of slab 2...
The value of the heat capacity for a substance depends on whether it’s measured under constant...
The value of the heat capacity for a substance depends on
whether it’s measured under constant pressure conditions or
constant volume conditions. The constant-pressure molar heat
capacity is given by
= (dq/dT)P
and the constant-volume heat capacity is given by
= (dq/dT)V
Note that we use d instead of
because q is not a state function of temperature, volume, and
pressure; its value depends on how we execute the process.
Here are several questions regarding heat capacity.
a. When we...
PT. In the system shown below material A has a conductivity which increases with x, whereas...
PT. In the system shown below material A has a conductivity which increases with x, whereas material B has a constant thermal conductivity and it's cross sectional area decreases with x The left hand side and right hand side temperatures are maintained at 100 °C and 50 °C respectively. Under these conditions, (a) show (draw) qualitatively (without doing any calculations) the temperature variation in both materials as function of x. You may assume that the flow of heat in the...
The rate constant (k) depends on which of the following? The pressure of gaseous products. The...
The rate constant (k) depends on which of the following? The pressure of gaseous products. The catalyst. The pressure of gaseous reactants. The temperature.
Consider the rate of heat conduction through a double-paned window that has a 1.45-m2 area and...
Consider
the rate of heat conduction through a double-paned window that has
a 1.45-m2 area and is made of two panes of
0.715-cm-thick glass separated by a 1.25-cm air gap. You can ignore
the increased heat transfer in the air gap due to convection.
Calculate the rate of heat conduction through this window, in
watts, given that the inside surface temperature is 15.0°C, while
the outside temperature is -10.0°C. Make the assumption that the
temperature differences across the two glass...
Which of the following are true about radiation of heat? Mark all that apply. The rate...
Which of the following are true about radiation of heat? Mark all that apply. The rate of energy transfer is proportional to the surface area of the object Radiation occurs when mass at one temperature transfers to a different location Radiation can transfer heat through empty space (vacuum) Radiation is a result of the collisions between molecules in two different objects at two different temperatures Which of the following characteristics describe good thermal conductors? Mark all that apply. High thermal...
3. Air enters a constant area duct at a Mach number of 0.14, a pressure of 195 kPa, and a temperature of 25 °C. Heat is added to the air that flows through the duct at a rate of 65 kJ/kg of air. A...
3. Air enters a constant area duct at a Mach number of 0.14, a pressure of 195 kPa, and a temperature of 25 °C. Heat is added to the air that flows through the duct at a rate of 65 kJ/kg of air. Assuming that the flow is steady and that the effects of wall friction can be ignored, find the temperature, pressure, and Mach number at which the air leaves the duct. Assume that the air behaves as a...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2)...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
This equation from problem 2 is needed to solve problem 3.
please skip C
problem 2 temperature field. Problem 3 (Fourier's Law of Heat Flow) From a temperature field, we can use Fourier's Law to compute the heat transfer rate (which is a vector field): Where k is a constant known as the thermal conductivity. For the purposes of this exercise, we can assume that k is 1. We wish to apply Fourier's Law to the temperature field given in...
A uniform steel plate has an area of 0.819 m2 When subjected to a temperature difference between its sides, a heat current of 25.7 kW is found to flow temperature difference when the plate is 5.73 cm thick? The thermal conductivity of steel is 50.2 WI(m K). it. What is the temperature gradient? What is the Temperature gradient: Number K/ m Temperature difference: Number (") The heat current is the amount of heat that flows per unit time
Problem Two slabs are in perfect contact. In slab 1 (thickness Li, thermal conductivity ki) heat is generating at a constant rate of S per uni volume. There is no heat generation inside slab 2 (thickness L2, thermal conductivity k2). The temperature at the left face of slab 1 (x-0) is maintained at To and the temperature at the interface between slab 1 and slab 2 (at x L) is found to be T. The right face of slab 2...
The value of the heat capacity for a substance depends on
whether it’s measured under constant pressure conditions or
constant volume conditions. The constant-pressure molar heat
capacity is given by
= (dq/dT)P
and the constant-volume heat capacity is given by
= (dq/dT)V
Note that we use d instead of
because q is not a state function of temperature, volume, and
pressure; its value depends on how we execute the process.
Here are several questions regarding heat capacity.
a. When we...
PT. In the system shown below material A has a conductivity which increases with x, whereas material B has a constant thermal conductivity and it's cross sectional area decreases with x The left hand side and right hand side temperatures are maintained at 100 °C and 50 °C respectively. Under these conditions, (a) show (draw) qualitatively (without doing any calculations) the temperature variation in both materials as function of x. You may assume that the flow of heat in the...
Consider
the rate of heat conduction through a double-paned window that has
a 1.45-m2 area and is made of two panes of
0.715-cm-thick glass separated by a 1.25-cm air gap. You can ignore
the increased heat transfer in the air gap due to convection.
Calculate the rate of heat conduction through this window, in
watts, given that the inside surface temperature is 15.0°C, while
the outside temperature is -10.0°C. Make the assumption that the
temperature differences across the two glass...
Which of the following are true about radiation of heat? Mark all that apply. The rate of energy transfer is proportional to the surface area of the object Radiation occurs when mass at one temperature transfers to a different location Radiation can transfer heat through empty space (vacuum) Radiation is a result of the collisions between molecules in two different objects at two different temperatures Which of the following characteristics describe good thermal conductors? Mark all that apply. High thermal...
3. Air enters a constant area duct at a Mach number of 0.14, a pressure of 195 kPa, and a temperature of 25 °C. Heat is added to the air that flows through the duct at a rate of 65 kJ/kg of air. Assuming that the flow is steady and that the effects of wall friction can be ignored, find the temperature, pressure, and Mach number at which the air leaves the duct. Assume that the air behaves as a...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
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