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Water at 320 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,...
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...
A thin-walled tube with the diameter of 0.1 m and the length of 2 m passes...
A thin-walled tube with the diameter of 0.1 m and the length of 2 m passes through a s at the temperature of To 700 K. If water at 280 K enters into the tube at the flow rate of 0.2 Kg/ Riotal Assume there is no radiation and solve this problem for the specials external fluid temperature, hwater 200W/m .K; cp 4000 J/kg. K: har 80 W/m2 .K. s, calculate the outlet temperature of the water after finding the...
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...
A water heater consists of a copper tube that carries water through hot gas in a...
A water heater consists of a copper tube that carries water through hot gas in a furnace, as shown in Fig. 1. hot gas at T, = 500° th=0.033 inch h, = 25 W/m2K Poytube = 0.25 inch water at Tv = 30° h = 500 W/m2K kube= 300 W/m-K Figure 1: Copper tube in a water heater. The copper tube has an outer radius, ro,tube = 0.25 inch and a tube wall thickness of th=0.033 inch. The conductivity of...
Twenty [kw] of heat is to be removed from 375 [k] water flowing at 0.15 [kg/s] into the inner pipe of concentric tube heat exchanger. Cooling water enters the annulus at 290 [k] and leaves at 320...
Twenty [kw] of heat is to be removed from 375 [k] water flowing at 0.15 [kg/s] into the inner pipe of concentric tube heat exchanger. Cooling water enters the annulus at 290 [k] and leaves at 320 [k] with a flow in the opposite direction of the inner flow. The diameter of the thin- walled inner pipe is 2.5 [cm] a) b) c) Calculate the exit temperature of the hot fluid and the mass flow rate of the cold fluid...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose wall...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
Water enters a 20-mm tube at 27°C with a flow rate of 450 kg/h. The rate...
Water enters a 20-mm tube at 27°C with a flow rate of 450 kg/h. The rate of heat transfer from the tube wall to the fluid is given as q5'(W/m) - a x, 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 control volume in the tube, derive an expression for the temperature distribution T m(x) of the water. Use this expression to determine...
A concentric tube heat exchanger for cooling lubricating oil consists of a thin-walled inner tube of...
A concentric tube heat exchanger for cooling lubricating oil
consists of a thin-walled inner tube of 25 mm diameter carrying
water and an outer tube of 45 mm diameter carrying the oil. The
exchanger operates in countercurrent flow with an overall heat
transfer coefficient of 55 W/m2 K and the tabulated average
properties given below. Mass flow rates of oil and water are both
0.1 kg/s, oil enters the exchanger at 100°C, and water enters the
exchanger at 30°C. (a)...
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...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
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...
A thin-walled tube with the diameter of 0.1 m and the length of 2 m passes through a s at the temperature of To 700 K. If water at 280 K enters into the tube at the flow rate of 0.2 Kg/ Riotal Assume there is no radiation and solve this problem for the specials external fluid temperature, hwater 200W/m .K; cp 4000 J/kg. K: har 80 W/m2 .K. s, calculate the outlet temperature of the water after finding the...
A water heater consists of a copper tube that carries water through hot gas in a furnace, as shown in Fig. 1. hot gas at T, = 500° th=0.033 inch h, = 25 W/m2K Poytube = 0.25 inch water at Tv = 30° h = 500 W/m2K kube= 300 W/m-K Figure 1: Copper tube in a water heater. The copper tube has an outer radius, ro,tube = 0.25 inch and a tube wall thickness of th=0.033 inch. The conductivity of...
Twenty [kw] of heat is to be removed from 375 [k] water flowing at 0.15 [kg/s] into the inner pipe of concentric tube heat exchanger. Cooling water enters the annulus at 290 [k] and leaves at 320 [k] with a flow in the opposite direction of the inner flow. The diameter of the thin- walled inner pipe is 2.5 [cm] a) b) c) Calculate the exit temperature of the hot fluid and the mass flow rate of the cold fluid...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
Water enters a 20-mm tube at 27°C with a flow rate of 450 kg/h. The rate of heat transfer from the tube wall to the fluid is given as q5'(W/m) - a x, 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 control volume in the tube, derive an expression for the temperature distribution T m(x) of the water. Use this expression to determine...
A concentric tube heat exchanger for cooling lubricating oil
consists of a thin-walled inner tube of 25 mm diameter carrying
water and an outer tube of 45 mm diameter carrying the oil. The
exchanger operates in countercurrent flow with an overall heat
transfer coefficient of 55 W/m2 K and the tabulated average
properties given below. Mass flow rates of oil and water are both
0.1 kg/s, oil enters the exchanger at 100°C, and water enters the
exchanger at 30°C. (a)...
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...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
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