1. Water (at 70 o C) flows with a velocity of 1 m/s in a 2...
1. Water (at 70 o C) flows with a velocity of 1 m/s in a 2 cm diameter pipe. The pipe wall temperature is at 100 o C.
(a) What is the heat transfer from the pipe wall to the fluid?
(b) Determine the critical velocity at which the flow would be characterized as laminar and for this flow velocity calculate the heat transfer
(c) Assume the diameter of the pipe is doubled while all other conditions remain the same. What would be the heat transfer from the pipe wall to the fluid?
(d) Repeat (a)-(c) for the condition where water comes in at 100 o C and the pipe wall is at 70o C
Homework Answers
Help mee!! Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe...
Help mee!!
Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
3. Hot water at an average temperature of 60°C and an average velocity of 0.6 m/s...
3. Hot water at an average temperature of 60°C and an average velocity of 0.6 m/s is flowing through a 5- m section of a thin-walled hot water pipe that has arn outer diameter of 2.5 cm. The pipe passes through the centre of a 14 cm-thick wall filled with fiberglass insulation (k-0.035 W/rm C), If the surfaces of the wall are at 18 C, determine (a) the rate of heat transfer from the pipe to the air in the...
5.16. Water is flowing in a 3-cm-diameter pipe at an average velocity of Uav 2 m/s....
5.16. Water is flowing in a 3-cm-diameter pipe at an average velocity of Uav 2 m/s. Assuming water density of ρ-1000 kg/m 3 and viscosity μ-10-3 N s'm2, calculate the velocity at the center of the pipe, the shear τ at the wall, and the Reynolds number. Assuming laminar flow, calculate friction coefficient C and pressure drop dp/dx.
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water i...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
Water flows in a pipe 1.7 cm in diameter and 480 cm long at a velocity...
Water flows in a pipe 1.7 cm in diameter and 480 cm long at a velocity of 8.8 m/s. The water enters at 100°C and exits at 80°C. Calculate the rate of heat removal per square centimeter of pipe wall. Neglect frictional losses and kinetic energy.
800 kg/m') flows with a 5. 10-2 N-s/rn"; ρ A fluid (μ mean velocity of 500...
800 kg/m') flows with a 5. 10-2 N-s/rn"; ρ A fluid (μ mean velocity of 500 mm/s in a 100 mm diameter smooth pipe Answer the following questions relating to the given flow conditions. a. What is the magnitude of the maximum velocity in the pipe? b. What is the magnitude of the resistance coefficient f?
1- Water is pumped through a 9 m long pipe with internal diameter of d-40 mm at the rate of 2.25 m3 per hour. The water inter the pipe at 30 °C and exit at 70°C. Determine: b) The convection heat tra...
1- Water is pumped through a 9 m long pipe with internal diameter of d-40 mm at the rate of 2.25 m3 per hour. The water inter the pipe at 30 °C and exit at 70°C. Determine: b) The convection heat transfer coefficient between the water and the pipe wall Ans. (103.5 Kw, 2604 W/m2.°C)
1- Water is pumped through a 9 m long pipe with internal diameter of d-40 mm at the rate of 2.25 m3 per hour. The...
3. Water flows at a uniform velocity of 1 em/s in a circular channel of diameter...
3. Water flows at a uniform velocity of 1 em/s in a circular channel of diameter 2 cm and length 2 m. A uniform heat flux of 10 W/m2 is supplied at the surface. Assume laminar flow and developed flow and temperature. (a) Calculate the variation of the mixing cup temperature with distance and the Nusselt number. (b) If the mixing cup temperature at the inlet is 22 oC, calculate the mixing cup and wall temperatures at the outlet? (e)...
I. Design of Fins (35 pt). A stripping process produces a hot fluid (80°C) that flows...
I. Design of Fins (35 pt). A stripping process produces a hot fluid (80°C) that flows inside copper pipe of 20 cm diameter (the thickness of the pipe wall is negligible). Outside the pipe, there is air flow at ambient temperature (20 °C). In order to recirculate the fluid produced, it is necessary to cool it down. This can be achieved by installing ten circular fins per meter of pipe (see figure below). These fins have a thickness of 0.1...
DON’T disregard the thermal conductivity of the pipe 3.) Oil at 200 C flows in a pipeline. The pipe has a 30-cm diameter and the flow is at an average velocity of 2 m/s. A 200-m-long section of t...
DON’T disregard the thermal conductivity of the pipe
3.) Oil at 200 C flows in a pipeline. The pipe has a 30-cm diameter and the flow is at an average velocity of 2 m/s. A 200-m-long section of the pipeline passes through icy waters of a lake at 0° C. The pipe is uncoated carbon steel with a thermal conductivity of 61 W/m o C. Determine (a) the temperature of the oil when the pipe leaves the lake, (b) the...
Help mee!!
Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
3. Hot water at an average temperature of 60°C and an average velocity of 0.6 m/s is flowing through a 5- m section of a thin-walled hot water pipe that has arn outer diameter of 2.5 cm. The pipe passes through the centre of a 14 cm-thick wall filled with fiberglass insulation (k-0.035 W/rm C), If the surfaces of the wall are at 18 C, determine (a) the rate of heat transfer from the pipe to the air in the...
5.16. Water is flowing in a 3-cm-diameter pipe at an average velocity of Uav 2 m/s. Assuming water density of ρ-1000 kg/m 3 and viscosity μ-10-3 N s'm2, calculate the velocity at the center of the pipe, the shear τ at the wall, and the Reynolds number. Assuming laminar flow, calculate friction coefficient C and pressure drop dp/dx.
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
800 kg/m') flows with a 5. 10-2 N-s/rn"; ρ A fluid (μ mean velocity of 500 mm/s in a 100 mm diameter smooth pipe Answer the following questions relating to the given flow conditions. a. What is the magnitude of the maximum velocity in the pipe? b. What is the magnitude of the resistance coefficient f?
1- Water is pumped through a 9 m long pipe with internal diameter of d-40 mm at the rate of 2.25 m3 per hour. The water inter the pipe at 30 °C and exit at 70°C. Determine: b) The convection heat transfer coefficient between the water and the pipe wall Ans. (103.5 Kw, 2604 W/m2.°C)
1- Water is pumped through a 9 m long pipe with internal diameter of d-40 mm at the rate of 2.25 m3 per hour. The...
3. Water flows at a uniform velocity of 1 em/s in a circular channel of diameter 2 cm and length 2 m. A uniform heat flux of 10 W/m2 is supplied at the surface. Assume laminar flow and developed flow and temperature. (a) Calculate the variation of the mixing cup temperature with distance and the Nusselt number. (b) If the mixing cup temperature at the inlet is 22 oC, calculate the mixing cup and wall temperatures at the outlet? (e)...
I. Design of Fins (35 pt). A stripping process produces a hot fluid (80°C) that flows inside copper pipe of 20 cm diameter (the thickness of the pipe wall is negligible). Outside the pipe, there is air flow at ambient temperature (20 °C). In order to recirculate the fluid produced, it is necessary to cool it down. This can be achieved by installing ten circular fins per meter of pipe (see figure below). These fins have a thickness of 0.1...
DON’T disregard the thermal conductivity of the pipe
3.) Oil at 200 C flows in a pipeline. The pipe has a 30-cm diameter and the flow is at an average velocity of 2 m/s. A 200-m-long section of the pipeline passes through icy waters of a lake at 0° C. The pipe is uncoated carbon steel with a thermal conductivity of 61 W/m o C. Determine (a) the temperature of the oil when the pipe leaves the lake, (b) the...
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