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 coefficient (W/mK) at the outlet? Assume uniform heat generation in the wall
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Water enters through a thick-walled tube having inner and outer diameters of 19 and 38 mm and 20 m long
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...
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)...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
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 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,...
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...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall resistance. The inner and outer diameters of the tube are Di 1.0 cm and Do 2 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho- 8400 W/m2.K, a) Determine the overall heat...
Q1) Inner surface of a side wall is used for heating of ambient-room air as shown...
Q1) Inner surface of a side wall is used for heating of ambient-room air as shown below. There is an electrical heater with 10 W/m2 heat flux generation between a layer of insulation and 2 cm thick marble exposed to ambient-room air at T-20 °C with h-20 W/m2K. k-0.04 W/mK Marble with a thickness of 2 cm Ts= 10 ℃ outside Ambient-room air at To Electrical heating layer (negligible thickness) of temperature T-? Insulation with a thickness of 5 cm...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
1. one wall is formed by two materials, the first one is 15cm thick and has...
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
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...
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)...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
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 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,...
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...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall resistance. The inner and outer diameters of the tube are Di 1.0 cm and Do 2 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho- 8400 W/m2.K, a) Determine the overall heat...
Q1) Inner surface of a side wall is used for heating of ambient-room air as shown below. There is an electrical heater with 10 W/m2 heat flux generation between a layer of insulation and 2 cm thick marble exposed to ambient-room air at T-20 °C with h-20 W/m2K. k-0.04 W/mK Marble with a thickness of 2 cm Ts= 10 ℃ outside Ambient-room air at To Electrical heating layer (negligible thickness) of temperature T-? Insulation with a thickness of 5 cm...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
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