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Water enters a 20-mm tube at 27°C with a flow rate of 450 kg/h. The rate...
Please be clear with steps. I am trying to understand the process and concept. Thank you...
Please be clear with steps. I am trying to understand the
process and concept. Thank you in advance.
8.12 water enters a tube at 27 0 with a llow rate of 450 kg/h. The heat transfer from the tube wall to the fluid is given as q(W/m)-ax, where the coefficient a is 20 W/m2 and x (m) is the axial distance from the tube entrance (a) Beginning with a properly defined differential con trol volume in the tube, derive an...
solve for part a and b Water at 20°C and a flow rate of 0.15 kg/s...
solve for part a and b
Water at 20°C and a flow rate of 0.15 kg/s enters a heated, thin-walled tube with a diameter of 15 mm and length of 2 m. The wall heat flux provided by the heating elements depends on the wall temperature according to the relation qs"(x)-95.0"[ 1+a(Ts(x)-Tref)] where 95.0" - 104 W/m2, a -0.2 K-1. Tref - 20°C, and Ts is the wall temperature in °C. Assume fully developed flow and thermal conditions with a...
Water enters through a thick-walled tube having inner and outer diameters of 19 and 38 mm and 20 m long
Water enters through a thick-walled tube having inner and outer diameters of 19 and 38 mm and 20 m long The inlet temperature is Tmi=17℃ and outlet temperature is Tmo = 50°C. The outer surface of the tube is well Insulated, and electrical heating within the wall provides for a uniform generation rate of q = 8X105 W/m3. If the inner surface temperature of the tube Ts = 60 °C at the outlet what is the local convection heat transfer...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm diameter, 1.75 m tube with a mass flow rate of 6 x 10-4 kg/s. A constant heat flux warms the air so that its exit mean temperature is Tm, 0 = 50°C. Find the required heat flux and wall surface temperature at the outlet. Assume fully developed flow. Step 1 What is the heat rate transfer to the air from the tube, in W?...
Water at m = 0.025 kg/s and Zn,i = 20°C enters an annular region formed by an inner tube of diame...
Water at m = 0.025 kg/s and Zn,i = 20°C enters an annular region formed by an inner tube of diameter D, = 20 mm and an outer tube of diameter Do-80 mm. Saturated steam flows through the inner tube, maintaining its surface at uniform temperature of T,i 100°C, while the outer surface of the outer tube is well insulated. If fully developed conditions may be assumed throughout the annulus, how long must the system be to provide an outlet...
Water at 340 K and a flow rate of 5 kg/s enters a black, thin‐walled tube,...
Water at 340 K and a flow rate of 5 kg/s enters a black,
thin‐walled tube, which passes through a large furnace whose walls
and air are at a temperature of 700 K. The diameter and length of
the tube are 0.25 m and 8 m, respectively. Convection coefficients
associated with water flow through the tube and airflow over the
tube are 300 W/m2·K and 50 W/m2·K, respectively.
Write an expression for the
linearized radiation coefficient corresponding to radiation
exchange...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and mass flow rate of ml . The pipe is half-embedded in insulation as shown in the figure below. Conditions are such that a linearly- increasing heat flux is applied to the exposed top half of the pipe. a. If the heat flux profile is q-q" + Or , derive an equation that describes the mean temperature of the water as a function of its...
Water at 320 K and a flow rate of 5 kg/s enters a black, thin-walled tube,...
Water at 320 K and a flow rate of 5 kg/s enters a black, thin-walled tube, which passes through a large furnace whose walls and air are at a temperature of 700 K. The diameter and length of the tube are 0.25 m and 8 m, respectively. Convection coefficients associated with water flow through the tube and airflow over the tube are 300 W/m2K and 50 W/m2.K, respectively. Tube, D-0.25 m L-8 me-1 Air 7-700 K Water -5 kas -Fumace,...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
Liquid water flows in an ASTM B75 copper tube at a mass flow rate of 3.6...
Liquid water flows in an ASTM B75 copper tube at a mass flow rate of 3.6 g/s. The water enters the tube at 40°C, and the tube surface is subjected to a constant heat flux at a rate of 1.8 kW. The tube is circular with an inner diameter of 25 mm and a length of 3 m. The maximum use temperature for ASTM B75 copper tube is 204°C. Would the surface temperature of the tube exceed the maximum use...
Please be clear with steps. I am trying to understand the
process and concept. Thank you in advance.
8.12 water enters a tube at 27 0 with a llow rate of 450 kg/h. The heat transfer from the tube wall to the fluid is given as q(W/m)-ax, where the coefficient a is 20 W/m2 and x (m) is the axial distance from the tube entrance (a) Beginning with a properly defined differential con trol volume in the tube, derive an...
solve for part a and b
Water at 20°C and a flow rate of 0.15 kg/s enters a heated, thin-walled tube with a diameter of 15 mm and length of 2 m. The wall heat flux provided by the heating elements depends on the wall temperature according to the relation qs"(x)-95.0"[ 1+a(Ts(x)-Tref)] where 95.0" - 104 W/m2, a -0.2 K-1. Tref - 20°C, and Ts is the wall temperature in °C. Assume fully developed flow and thermal conditions with a...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm diameter, 1.75 m tube with a mass flow rate of 6 x 10-4 kg/s. A constant heat flux warms the air so that its exit mean temperature is Tm, 0 = 50°C. Find the required heat flux and wall surface temperature at the outlet. Assume fully developed flow. Step 1 What is the heat rate transfer to the air from the tube, in W?...
Water at m = 0.025 kg/s and Zn,i = 20°C enters an annular region formed by an inner tube of diameter D, = 20 mm and an outer tube of diameter Do-80 mm. Saturated steam flows through the inner tube, maintaining its surface at uniform temperature of T,i 100°C, while the outer surface of the outer tube is well insulated. If fully developed conditions may be assumed throughout the annulus, how long must the system be to provide an outlet...
Water at 340 K and a flow rate of 5 kg/s enters a black,
thin‐walled tube, which passes through a large furnace whose walls
and air are at a temperature of 700 K. The diameter and length of
the tube are 0.25 m and 8 m, respectively. Convection coefficients
associated with water flow through the tube and airflow over the
tube are 300 W/m2·K and 50 W/m2·K, respectively.
Write an expression for the
linearized radiation coefficient corresponding to radiation
exchange...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and mass flow rate of ml . The pipe is half-embedded in insulation as shown in the figure below. Conditions are such that a linearly- increasing heat flux is applied to the exposed top half of the pipe. a. If the heat flux profile is q-q" + Or , derive an equation that describes the mean temperature of the water as a function of its...
Water at 320 K and a flow rate of 5 kg/s enters a black, thin-walled tube, which passes through a large furnace whose walls and air are at a temperature of 700 K. The diameter and length of the tube are 0.25 m and 8 m, respectively. Convection coefficients associated with water flow through the tube and airflow over the tube are 300 W/m2K and 50 W/m2.K, respectively. Tube, D-0.25 m L-8 me-1 Air 7-700 K Water -5 kas -Fumace,...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
Liquid water flows in an ASTM B75 copper tube at a mass flow rate of 3.6 g/s. The water enters the tube at 40°C, and the tube surface is subjected to a constant heat flux at a rate of 1.8 kW. The tube is circular with an inner diameter of 25 mm and a length of 3 m. The maximum use temperature for ASTM B75 copper tube is 204°C. Would the surface temperature of the tube exceed the maximum use...
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